U Codes
U codes in the OBD-II system represent “Network” or “User Network” communication issues between control modules. These diagnostic trouble codes (DTCs) help identify problems within the vehicle’s data bus or CAN system, which can affect how electronic modules share information. The U code family is further divided into specific subcategories that indicate the nature of the fault:
- U00XX – Network Electrical
- U01XX – Network Communication
- U02XX – Network Communication
- U03XX – Network Software
- U04XX – Network Data
- U05XX – Network Data
- U06XX – U0FXX – ISO/SAE Reserved
- U1XXX – Manufacturer Controlled DTC
- U2XXX – Manufacturer Controlled DTC
- U30XX – Control Module/Power Distribution
- U31XX – U3FXX – ISO/SAE Reserved
| DTC Number | DTC Naming | Location |
| U0000 | ISO/SAE Reserved | |
| U0001 | High Speed CAN Communication Bus | |
| U0002 | High Speed CAN Communication Bus Performance | |
| U0003 | High Speed CAN Communication Bus (+) Open | |
| U0004 | High Speed CAN Communication Bus (+) Low | |
| U0005 | High Speed CAN Communication Bus (+) High | |
| U0006 | High Speed CAN Communication Bus (-) Open | |
| U0007 | High Speed CAN Communication Bus (-) Low | |
| U0008 | High Speed CAN Communication Bus (-) High | |
| U0009 | High Speed CAN Communication Bus (-) shorted to Bus (+) | |
| U000A | ISO/SAE Reserved | |
| U000B | ISO/SAE Reserved | |
| U000C | ISO/SAE Reserved | |
| U000D | ISO/SAE Reserved | |
| U000E | ISO/SAE Reserved | |
| U000F | ISO/SAE Reserved | |
| U0010 | Medium Speed CAN Communication Bus | |
| U0011 | Medium Speed CAN Communication Bus Performance | |
| U0012 | Medium Speed CAN Communication Bus (+) Open | |
| U0013 | Medium Speed CAN Communication Bus (+) Low | |
| U0014 | Medium Speed CAN Communication Bus (+) High | |
| U0015 | Medium Speed CAN Communication Bus (-) Open | |
| U0016 | Medium Speed CAN Communication Bus (-) Low | |
| U0017 | Medium Speed CAN Communication Bus (-) High | |
| U0018 | Medium Speed CAN Communication Bus (-) shorted to Bus (+) | |
| U0019 | Low Speed CAN Communication Bus | |
| U001A | ISO/SAE Reserved | |
| U001B | ISO/SAE Reserved | |
| U001C | ISO/SAE Reserved | |
| U001D | ISO/SAE Reserved | |
| U001E | ISO/SAE Reserved | |
| U001F | ISO/SAE Reserved | |
| U0020 | Low Speed CAN Communication Bus Performance | |
| U0021 | Low Speed CAN Communication Bus (+) Open | |
| U0022 | Low Speed CAN Communication Bus (+) Low | |
| U0023 | Low Speed CAN Communication Bus (+) High | |
| U0024 | Low Speed CAN Communication Bus (-) Open | |
| U0025 | Low Speed CAN Communication Bus (-) Low | |
| U0026 | Low Speed CAN Communication Bus (-) High | |
| U0027 | Low Speed CAN Communication Bus (-) shorted to Bus (+) | |
| U0028 | Vehicle Communication Bus A | |
| U0029 | Vehicle Communication Bus A Performance | |
| U002A | ISO/SAE Reserved | |
| U002B | ISO/SAE Reserved | |
| U002C | ISO/SAE Reserved | |
| U002D | ISO/SAE Reserved | |
| U002E | ISO/SAE Reserved | |
| U002F | ISO/SAE Reserved | |
| U0030 | Vehicle Communication Bus A (+) Open | |
| U0031 | Vehicle Communication Bus A (+) Low | |
| U0032 | Vehicle Communication Bus A (+) High | |
| U0033 | Vehicle Communication Bus A (-) Open | |
| U0034 | Vehicle Communication Bus A (-) Low | |
| U0035 | Vehicle Communication Bus A (-) High | |
| U0036 | Vehicle Communication Bus A (-) shorted to Bus A (+) | |
| U0037 | Vehicle Communication Bus B | |
| U0038 | Vehicle Communication Bus B Performance | |
| U0039 | Vehicle Communication Bus B (+) Open | |
| U003A | ISO/SAE Reserved | |
| U003B | ISO/SAE Reserved | |
| U003C | ISO/SAE Reserved | |
| U003D | ISO/SAE Reserved | |
| U003E | ISO/SAE Reserved | |
| U003F | ISO/SAE Reserved | |
| U0040 | Vehicle Communication Bus B (+) Low | |
| U0041 | Vehicle Communication Bus B (+) High | |
| U0042 | Vehicle Communication Bus B (-) Open | |
| U0043 | Vehicle Communication Bus B (-) Low | |
| U0044 | Vehicle Communication Bus B (-) High | |
| U0045 | Vehicle Communication Bus B (-) shorted to Bus B (+) | |
| U0046 | Vehicle Communication Bus C | |
| U0047 | Vehicle Communication Bus C Performance | |
| U0048 | Vehicle Communication Bus C (+) Open | |
| U0049 | Vehicle Communication Bus C (+) Low | |
| U004A | ISO/SAE Reserved | |
| U004B | ISO/SAE Reserved | |
| U004C | ISO/SAE Reserved | |
| U004D | ISO/SAE Reserved | |
| U004E | ISO/SAE Reserved | |
| U004F | ISO/SAE Reserved | |
| U0050 | Vehicle Communication Bus C (+) High | |
| U0051 | Vehicle Communication Bus C (-) Open | |
| U0052 | Vehicle Communication Bus C (-) Low | |
| U0053 | Vehicle Communication Bus C (-) High | |
| U0054 | Vehicle Communication Bus C (-) shorted to Bus C (+) | |
| U0055 | Vehicle Communication Bus D | |
| U0056 | Vehicle Communication Bus D Performance | |
| U0057 | Vehicle Communication Bus D (+) Open | |
| U0058 | Vehicle Communication Bus D (+) Low | |
| U0059 | Vehicle Communication Bus D (+) High | |
| U005A | ISO/SAE Reserved | |
| U005B | ISO/SAE Reserved | |
| U005C | ISO/SAE Reserved | |
| U005D | ISO/SAE Reserved | |
| U005E | ISO/SAE Reserved | |
| U005F | ISO/SAE Reserved | |
| U0060 | Vehicle Communication Bus D (-) Open | |
| U0061 | Vehicle Communication Bus D (-) Low | |
| U0062 | Vehicle Communication Bus D (-) High | |
| U0063 | Vehicle Communication Bus D (-) shorted to Bus D (+) | |
| U0064 | Vehicle Communication Bus E | |
| U0065 | Vehicle Communication Bus E Performance | |
| U0066 | Vehicle Communication Bus E (+) Open | |
| U0067 | Vehicle Communication Bus E (+) Low | |
| U0068 | Vehicle Communication Bus E (+) High | |
| U0069 | Vehicle Communication Bus E (-) Open | |
| U006A | ISO/SAE Reserved | |
| U006B | ISO/SAE Reserved | |
| U006C | ISO/SAE Reserved | |
| U006D | ISO/SAE Reserved | |
| U006E | ISO/SAE Reserved | |
| U006F | ISO/SAE Reserved | |
| U0070 | Vehicle Communication Bus E (-) Low | |
| U0071 | Vehicle Communication Bus E (-) High | |
| U0072 | Vehicle Communication Bus E (-) shorted to Bus E (+) | |
| U0073 | Control Module Communication Bus "A" Off | |
| U0074 | Control Module Communication Bus "B" Off | |
| U0075 – U00FF | ISO/SAE Reserved | |
| U0100 | Lost Communication With ECM/PCM "A" | |
| U0101 | Lost Communication with TCM | |
| U0102 | Lost Communication with Transfer Case Control Module | |
| U0103 | Lost Communication With Gear Shift Control Module "A" | |
| U0104 | Lost Communication With Cruise Control Module | |
| U0105 | Lost Communication With Fuel Injector Control Module | |
| U0106 | Lost Communication With Glow Plug Control Module | |
| U0107 | Lost Communication With Throttle Actuator Control Module | |
| U0108 | Lost Communication With Alternative Fuel Control Module | |
| U0109 | Lost Communication With Fuel Pump Control Module | |
| U010A | Lost Communication With Exhaust Gas Recirculation Control Module | |
| U011B | Lost Communication With Rocker Arm Control Module "A" | |
| U011C | Lost Communication With Rocker Arm Control Module "B" | |
| U011D | Lost Communication With All Wheel Drive Control Module | |
| U011E | ISO/SAE Reserved | |
| U011F | ISO/SAE Reserved | |
| U0120 | Lost Communication With Starter / Generator Control Module | |
| U0121 | Lost Communication With Anti-Lock Brake System (ABS) Control Module | |
| U0122 | Lost Communication With Vehicle Dynamics Control Module | |
| U0123 | Lost Communication With Yaw Rate Sensor Module | |
| U0124 | Lost Communication With Lateral Acceleration Sensor Module | |
| U0125 | Lost Communication With Multi-axis Acceleration Sensor Module | |
| U0126 | Lost Communication With Steering Angle Sensor Module | |
| U0127 | Lost Communication With Tire Pressure Monitor Module | |
| U0128 | Lost Communication With Park Brake Control Module | |
| U0129 | Lost Communication With Brake System Control Module | |
| U012A | ISO/SAE Reserved | |
| U012B | ISO/SAE Reserved | |
| U012C | ISO/SAE Reserved | |
| U012D | ISO/SAE Reserved | |
| U012E | ISO/SAE Reserved | |
| U012F | ISO/SAE Reserved | |
| U0130 | Lost Communication With Steering Effort Control Module | |
| U0131 | Lost Communication With Power Steering Control Module | |
| U0132 | Lost Communication With Suspension Control Module "A" | |
| U0133 | Lost Communication With Active Roll Control Module | |
| U0134 | Lost Communication With Power Steering Control Module | Rear |
| U0135 | Lost Communication With Differential Control Module | Front |
| U0136 | Lost Communication With Differential Control Module | Rear |
| U0137 | Lost Communication With Trailer Brake Control Module | |
| U0138 | Lost Communication With All Terrain Control Module | |
| U0139 | Lost Communication With Suspension Control Module "B" | |
| U013A | ISO/SAE Reserved | |
| U013B | ISO/SAE Reserved | |
| U013C | ISO/SAE Reserved | |
| U013D | ISO/SAE Reserved | |
| U013E | ISO/SAE Reserved | |
| U013F | ISO/SAE Reserved | |
| U0140 | Lost Communication With Body Control Module | |
| U0141 | Lost Communication With Body Control Module "A" | |
| U0142 | Lost Communication With Body Control Module "B" | |
| U0143 | Lost Communication With Body Control Module "C" | |
| U0144 | Lost Communication With Body Control Module "D" | |
| U0145 | Lost Communication With Body Control Module "E" | |
| U0146 | Lost Communication With Gateway "A" | |
| U0147 | Lost Communication With Gateway "B" | |
| U0148 | Lost Communication With Gateway "C" | |
| U0149 | Lost Communication With Gateway "D" | |
| U014A | ISO/SAE Reserved | |
| U014B | ISO/SAE Reserved | |
| U014C | ISO/SAE Reserved | |
| U014D | ISO/SAE Reserved | |
| U014E | ISO/SAE Reserved | |
| U014F | ISO/SAE Reserved | |
| U0150 | Lost Communication With Gateway "E" | |
| U0151 | Lost Communication With Restraints Control Module | |
| U0152 | Lost Communication With Side Restraints Control Module | Left |
| U0153 | Lost Communication With Side Restraints Control Module | Right |
| U0154 | Lost Communication With Restraints Occupant Classification System Module | |
| U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module | |
| U0156 | Lost Communication With Information Center "A" | |
| U0157 | Lost Communication With Information Center "B" | |
| U0158 | Lost Communication With Head Up Display | |
| U0159 | Lost Communication With Parking Assist Control Module "A" | |
| U015A | ISO/SAE Reserved | |
| U015B | ISO/SAE Reserved | |
| U015C | ISO/SAE Reserved | |
| U015D | ISO/SAE Reserved | |
| U015E | ISO/SAE Reserved | |
| U015F | ISO/SAE Reserved | |
| U0160 | Lost Communication With Audible Alert Control Module | |
| U0161 | Lost Communication With Compass Module | |
| U0162 | Lost Communication With Navigation Display Module | |
| U0163 | Lost Communication With Navigation Control Module | |
| U0164 | Lost Communication With HVAC Control Module | |
| U0165 | Lost Communication With HVAC Control Module | Rear |
| U0166 | Lost Communication With Auxiliary Heater Control Module | |
| U0167 | Lost Communication With Vehicle Immobilizer Control Module | |
| U0168 | Lost Communication With Vehicle Security Control Module | |
| U0169 | Lost Communication With Sunroof Control Module | |
| U016A | Lost Communication With Global Positioning System Module | |
| U016B | ISO/SAE Reserved | |
| U016C | ISO/SAE Reserved | |
| U016D | ISO/SAE Reserved | |
| U016E | ISO/SAE Reserved | |
| U016F | ISO/SAE Reserved | |
| U0170 | Lost Communication With "Restraints System Sensor A" | |
| U0171 | Lost Communication With "Restraints System Sensor B" | |
| U0172 | Lost Communication With "Restraints System Sensor C" | |
| U0173 | Lost Communication With "Restraints System Sensor D" | |
| U0174 | Lost Communication With "Restraints System Sensor E" | |
| U0175 | Lost Communication With "Restraints System Sensor F" | |
| U0176 | Lost Communication With "Restraints System Sensor G" | |
| U0177 | Lost Communication With "Restraints System Sensor H" | |
| U0178 | Lost Communication With "Restraints System Sensor I" | |
| U0179 | Lost Communication With "Restraints System Sensor J" | |
| U017A | Lost Communication With "Restraints System Sensor K" | |
| U017B | Lost Communication With "Restraints System Sensor L" | |
| U017C | Lost Communication With "Restraints System Sensor M" | |
| U017D | Lost Communication With "Restraints System Sensor N" | |
| U017E | Lost Communication With Seatbelt Pretensioner Module "A" | |
| U017F | Lost Communication With Seatbelt Pretensioner Module "B" | |
| U0180 | Lost Communication With Automatic Lighting Control Module | |
| U0181 | Lost Communication With Headlamp Leveling Control Module | |
| U0182 | Lost Communication With Lighting Control Module | Front |
| U0183 | Lost Communication With Lighting Control Module | Rear "A" |
| U0184 | Lost Communication With Radio | |
| U0185 | Lost Communication With Antenna Control Module | |
| U0186 | Lost Communication With Audio Amplifier "A" | |
| U0187 | Lost Communication With Digital Disc Player/Changer Module "A" | |
| U0188 | Lost Communication With Digital Disc Player/Changer Module "B" | |
| U0189 | Lost Communication With Digital Disc Player/Changer Module "C" | |
| U018A | ISO/SAE Reserved | |
| U018B | ISO/SAE Reserved | |
| U018C | ISO/SAE Reserved | |
| U018D | ISO/SAE Reserved | |
| U018E | ISO/SAE Reserved | |
| U018F | ISO/SAE Reserved | |
| U0190 | Lost Communication With Digital Disc Player/Changer Module "D" | |
| U0191 | Lost Communication With Television | |
| U0192 | Lost Communication With Personal Computer | |
| U0193 | Lost Communication With "Digital Audio Control Module A" | |
| U0194 | Lost Communication With "Digital Audio Control Module B" | |
| U0195 | Lost Communication With Subscription Entertainment Receiver Module | |
| U0196 | Lost Communication With Entertainment Control Module | Rear "A" |
| U0197 | Lost Communication With Telephone Control Module | |
| U0198 | Lost Communication With Telematic Control Module | |
| U0199 | Lost Communication With "Door Control Module A" | |
| U019A – U01FF | ISO/SAE Reserved | |
| U0200 | Lost Communication With "Door Control Module B" | |
| U0201 | Lost Communication With "Door Control Module C" | |
| U0202 | Lost Communication With "Door Control Module D" | |
| U0203 | Lost Communication With "Door Control Module E" | |
| U0204 | Lost Communication With "Door Control Module F" | |
| U0205 | Lost Communication With "Door Control Module G" | |
| U0206 | Lost Communication With Folding Top Control Module | |
| U0207 | Lost Communication With Moveable Roof Control Module | |
| U0208 | Lost Communication With "Seat Control Module A" | |
| U0209 | Lost Communication With "Seat Control Module B" | |
| U020A | ISO/SAE Reserved | |
| U020B | ISO/SAE Reserved | |
| U020C | ISO/SAE Reserved | |
| U020D | ISO/SAE Reserved | |
| U020E | ISO/SAE Reserved | |
| U020F | ISO/SAE Reserved | |
| U0210 | Lost Communication With "Seat Control Module C" | |
| U0211 | Lost Communication With "Seat Control Module D" | |
| U0212 | Lost Communication With Steering Column Control Module | |
| U0213 | Lost Communication With Mirror Control Module | |
| U0214 | Lost Communication With Remote Function Actuation | |
| U0215 | Lost Communication With "Door Switch A" | |
| U0216 | Lost Communication With "Door Switch B" | |
| U0217 | Lost Communication With "Door Switch C" | |
| U0218 | Lost Communication With "Door Switch D" | |
| U0219 | Lost Communication With "Door Switch E" | |
| U021A | ISO/SAE Reserved | |
| U021B | ISO/SAE Reserved | |
| U021C | ISO/SAE Reserved | |
| U021D | ISO/SAE Reserved | |
| U021E | ISO/SAE Reserved | |
| U021F | ISO/SAE Reserved | |
| U0220 | Lost Communication With "Door Switch F" | |
| U0221 | Lost Communication With "Door Switch G" | |
| U0222 | Lost Communication With "Door Window Motor A" | |
| U0223 | Lost Communication With "Door Window Motor B" | |
| U0224 | Lost Communication With "Door Window Motor C" | |
| U0225 | Lost Communication With "Door Window Motor D" | |
| U0226 | Lost Communication With "Door Window Motor E" | |
| U0227 | Lost Communication With "Door Window Motor F" | |
| U0228 | Lost Communication With "Door Window Motor G" | |
| U0229 | Lost Communication With Heated Steering Wheel Module | |
| U022A | ISO/SAE Reserved | |
| U022B | ISO/SAE Reserved | |
| U022C | ISO/SAE Reserved | |
| U022D | ISO/SAE Reserved | |
| U022E | ISO/SAE Reserved | |
| U022F | ISO/SAE Reserved | |
| U0230 | Lost Communication With Rear Gate Module | |
| U0231 | Lost Communication With Rain Sensing Module | |
| U0232 | Lost Communication With Side Obstacle Detection Control Module | Left |
| U0233 | Lost Communication With Side Obstacle Detection Control Module | Right |
| U0234 | Lost Communication With Convenience Recall Module | |
| U0235 | Lost Communication With Cruise Control Front Distance Range Sensor | Single Sensor or Center |
| U0236 | Lost Communication With Column Lock Module | |
| U0237 | Lost Communication With "Digital Audio Control Module C" | |
| U0238 | Lost Communication With "Digital Audio Control Module D" | |
| U0239 | Lost Communication With Entrapment Control Module "A" | |
| U023A | Lost Communication With Image Processing Module "A" | |
| U023B | Lost Communication With Image Processing Module "B" | |
| U023C | Lost Communication With Image Processing Module "C" | |
| U023D | Lost Communication With Cruise Control Front Distance Range Sensor | Left |
| U023E | Lost Communication With Cruise Control Front Distance Range Sensor | Right |
| U023F | ISO/SAE Reserved | |
| U0240 | Lost Communication With Entrapment Control Module "B" | |
| U0241 | Lost Communication With Headlamp Control Module "A" | |
| U0242 | Lost Communication With Headlamp Control Module "B" | |
| U0243 | Lost Communication With Parking Assist Control Module "B" | |
| U0244 | Lost Communication With Running Board Control Module "A" | |
| U0245 | Lost Communication With Entertainment Control Module | Front |
| U0246 | Lost Communication With "Seat Control Module E" | |
| U0247 | Lost Communication With "Seat Control Module F" | |
| U0248 | Lost Communication With Remote Accessory Module | |
| U0249 | Lost Communication With Entertainment Control Module | Rear "B" |
| U024A | Lost Communication With Interior Lighting Control Module | |
| U024B | ISO/SAE Reserved | |
| U024C | ISO/SAE Reserved | |
| U024D | ISO/SAE Reserved | |
| U024E | ISO/SAE Reserved | |
| U024F | ISO/SAE Reserved | |
| U0250 | Lost Communication With Impact Classification System Module | |
| U0251 | Lost Communication With Running Board Control Module "B" | |
| U0252 | Lost Communication With Lighting Control Module | Rear "B" |
| U0253 | Lost Communication With Accessory Protocol Interface Module | |
| U0254 | Lost Communication With Remote Start Module | |
| U0255 | Lost Communication With Front Display Interface Module | |
| U0256 | Lost Communication With Front Controls Interface Module "A" | |
| U0257 | Lost Communication With Front Controls/Display Interface Module | |
| U0258 | Lost Communication With Radio Transceiver | |
| U0259 | Lost Communication With Special Purpose Vehicle Control Module "A" | |
| U025A | Lost Communication With Special Purpose Vehicle Control Module "B" | |
| U025B | Lost Communication With Special Purpose Vehicle Control Module "C" | |
| U025C | Lost Communication With Special Purpose Vehicle Control Module "D" | |
| U025D | Lost Communication With Front Controls Interface Module "B" | |
| U025E | ISO/SAE Reserved | |
| U025F | ISO/SAE Reserved | |
| U0260 | Lost Communication With Seat Control Switch Module "A" | |
| U0261 | Lost Communication With Seat Control Switch Module "B" | |
| U0262 | Lost Communication With Audio Amplifier "B" | |
| U0263 | Lost Communication With Speech Recognition Module | |
| U0264 | Lost Communication With Camera Module | Rear |
| U0265 | ISO/SAE Reserved | |
| U0266 | ISO/SAE Reserved | |
| U0267 | ISO/SAE Reserved | |
| U0268 | ISO/SAE Reserved | |
| U0269 | ISO/SAE Reserved | |
| U026A | ISO/SAE Reserved | |
| U026B | ISO/SAE Reserved | |
| U026C | ISO/SAE Reserved | |
| U026D | ISO/SAE Reserved | |
| U026E | ISO/SAE Reserved | |
| U026F | ISO/SAE Reserved | |
| U0270 | ISO/SAE Reserved | |
| U0271 | ISO/SAE Reserved | |
| U0272 | ISO/SAE Reserved | |
| U0273 | ISO/SAE Reserved | |
| U0274 | ISO/SAE Reserved | |
| U0275 | ISO/SAE Reserved | |
| U0276 | ISO/SAE Reserved | |
| U0277 | ISO/SAE Reserved | |
| U0278 | ISO/SAE Reserved | |
| U0279 | ISO/SAE Reserved | |
| U027A | ISO/SAE Reserved | |
| U027B | ISO/SAE Reserved | |
| U027C | ISO/SAE Reserved | |
| U027D | ISO/SAE Reserved | |
| U027E | ISO/SAE Reserved | |
| U027F | ISO/SAE Reserved | |
| U0280 | ISO/SAE Reserved | |
| U0281 | ISO/SAE Reserved | |
| U0282 | ISO/SAE Reserved | |
| U0283 | ISO/SAE Reserved | |
| U0284 | ISO/SAE Reserved | |
| U0285 | ISO/SAE Reserved | |
| U0286 | Lost Communication With Radiator Anti Tamper Device | |
| U0287 | Lost Communication With Transmission Fluid Pump Module | |
| U0288 | Lost Communication With DC to AC Converter Control Module "A" | |
| U0289 | Lost Communication With DC to AC Converter Control Module "B" | |
| U028A | ISO/SAE Reserved | |
| U028B | ISO/SAE Reserved | |
| U028C | ISO/SAE Reserved | |
| U028D | ISO/SAE Reserved | |
| U028E | ISO/SAE Reserved | |
| U028F | ISO/SAE Reserved | |
| U0290 | ISO/SAE Reserved | |
| U0291 | Lost Communication With Gear Shift Control Module "B" | |
| U0292 | Lost Communication With Drive Motor Control Module "B" | |
| U0293 | Lost Communication With Hybrid Powertrain Control Module | |
| U0294 | Lost Communication With Powertrain Control Monitor Module | |
| U0295 | Lost Communication With AC to AC Converter Control Module | |
| U0296 | Lost Communication With AC to DC Converter Control Module "A" | |
| U0297 | Lost Communication With AC to DC Converter Control Module "B" | |
| U0298 | Lost Communication With DC to DC Converter Control Module "A" | |
| U0299 | Lost Communication With DC to DC Converter Control Module "B" | |
| U029A | Lost Communication With Hybrid Battery Pack Sensor Module | |
| U029B | Lost Communication With Drive Motor Control Module "C" | |
| U029C | Lost Communication With Drive Motor Control Module "D" | |
| U029D | Lost Communication With NOX Sensor "A" | |
| U029E | Lost Communication With NOX Sensor "B" | |
| U029F – U02FF | ISO/SAE Reserved | |
| U0300 | Internal Control Module Software Incompatibility | |
| U0301 | Software Incompatibility With ECM/PCM | |
| U0302 | Software Incompatibility With Transmission Control Module | |
| U0303 | Software Incompatibility With Transfer Case Control Module | |
| U0304 | Software Incompatibility With Gear Shift Control Module "A" | |
| U0305 | Software Incompatibility With Cruise Control Module | |
| U0306 | Software Incompatibility With Fuel Injector Control Module | |
| U0307 | Software Incompatibility With Glow Plug Control Module | |
| U0308 | Software Incompatibility With Throttle Actuator Control Module | |
| U0309 | Software Incompatibility With Alternative Fuel Control Module | |
| U030A | ISO/SAE Reserved | |
| U030B | ISO/SAE Reserved | |
| U030C | ISO/SAE Reserved | |
| U030D | ISO/SAE Reserved | |
| U030E | ISO/SAE Reserved | |
| U030F | ISO/SAE Reserved | |
| U0310 | Software Incompatibility With Fuel Pump Control Module | |
| U0311 | Software Incompatibility With Drive Motor Control Module | |
| U0312 | Software Incompatibility With Battery Energy Control Module A | |
| U0313 | Software Incompatibility With Battery Energy Control Module B | |
| U0314 | Software Incompatibility With Four-Wheel Drive Clutch Control Module |
|
| U0315 | Software Incompatibility With Anti-Lock Brake System Control Module | |
| U0316 | Software Incompatibility With Vehicle Dynamics Control Module | |
| U0317 | Software Incompatibility With Park Brake Control Module | |
| U0318 | Software Incompatibility With Brake System Control Module | |
| U0319 | Software Incompatibility With Steering Effort Control Module | |
| U031A | ISO/SAE Reserved | |
| U031B | ISO/SAE Reserved | |
| U031C | ISO/SAE Reserved | |
| U031D | ISO/SAE Reserved | |
| U031E | ISO/SAE Reserved | |
| U031F | ISO/SAE Reserved | |
| U0320 | Software Incompatibility With Power Steering Control Module | |
| U0321 | Software Incompatibility With Suspension Control Module "A" | |
| U0322 | Software Incompatibility With Body Control Module | |
| U0323 | Software Incompatibility With Instrument Panel Control Module | |
| U0324 | Software Incompatibility With HVAC Control Module | |
| U0325 | Software Incompatibility With Auxiliary Heater Control Module | |
| U0326 | Software Incompatibility With Vehicle Immobilizer Control Module | |
| U0327 | Software Incompatibility With Vehicle Security Control Module | |
| U0328 | Software Incompatibility With Steering Angle Sensor Module | |
| U0329 | Software Incompatibility With Steering Column Control Module | |
| U032A | ISO/SAE Reserved | |
| U032B | ISO/SAE Reserved | |
| U032C | ISO/SAE Reserved | |
| U032D | ISO/SAE Reserved | |
| U032E | ISO/SAE Reserved | |
| U032F | ISO/SAE Reserved | |
| U0331 | Software Incompatibility With Body Control Module "A" | |
| U0332 | Software Incompatibility With Multi-axis Acceleration Sensor Module | |
| U0333 | Software Incompatibility With Gear Shift Control Module "B" | |
| U0334 | Software Incompatibility With Radio | |
| U0335 | Software Incompatibility With Hybrid Battery Pack Sensor Module | |
| U0336 | Software Incompatibility with Restraints Control Module | |
| U0337 – U03FF | ISO/SAE Reserved | |
| U0400 | Invalid Data Received | |
| U0401 | Invalid Data Received From ECM/PCM "A" | |
| U0402 | Invalid Data Received From TCM | |
| U0403 | Invalid Data Received From Transfer Case Control Module | |
| U0404 | Invalid Data Received From Gear Shift Control Module "A" | |
| U0405 | Invalid Data Received From Cruise Control Module | |
| U0406 | Invalid Data Received From Fuel Injector Control Module | |
| U0407 | Invalid Data Received From Glow Plug Control Module | |
| U0408 | Invalid Data Received From Throttle Actuator Control Module | |
| U0409 | Invalid Data Received From Alternative Fuel Control Module | |
| U040A | Invalid Data Received From Air Conditioning Control Module | |
| U040B | Invalid Data Received From Exhaust Gas Recirculation Control Module "A" | |
| U040C | Invalid Data Received From Exhaust Gas Recirculation Control Module "B" | |
| U040D | Invalid Data Received From Turbocharger/Supercharger Control Module "A" | |
| U040E | Invalid Data Received From Turbocharger/Supercharger Control Module "B" | |
| U040F | Invalid Data Received From Reductant Control Module | |
| U0410 | Invalid Data Received From Fuel Pump Control Module | |
| U0411 | Invalid Data Received From Drive Motor Control Module "A" | |
| U0412 | Invalid Data Received From Battery Energy Control Module "A" | |
| U0413 | Invalid Data Received From Battery Energy Control Module "B" | |
| U0414 | Invalid Data Received From Four-Wheel Drive Clutch Control Module | |
| U0415 | Invalid Data Received From Anti-Lock Brake System (ABS) Control Module | |
| U0416 | Invalid Data Received From Vehicle Dynamics Control Module | |
| U0417 | Invalid Data Received From Park Brake Control Module | |
| U0418 | Invalid Data Received From Brake System Control Module | |
| U0419 | Invalid Data Received From Steering Effort Control Module | |
| U041A | ISO/SAE Reserved | |
| U041B | Invalid Data Received From Exhaust Gas Sensor Module | |
| U041C | Invalid Data Received From Rocker Arm Control Module "A" | |
| U041D | Invalid Data Received From Rocker Arm Control Module "B" | |
| U041E | Invalid Data Received From All Wheel Drive Control Module | |
| U041F | ISO/SAE Reserved | |
| U0420 | Invalid Data Received From Power Steering Control Module | |
| U0421 | Invalid Data Received From Suspension Control Module "A" | |
| U0422 | Invalid Data Received From Body Control Module | |
| U0423 | Invalid Data Received From Instrument Panel Cluster Control | |
| U0424 | Invalid Data Received From HVAC Control Module | |
| U0425 | Invalid Data Received From Auxiliary Heater Control Module | |
| U0426 | Invalid Data Received From Vehicle Immobilizer Control Module | |
| U0427 | Invalid Data Received From Vehicle Security Control Module | |
| U0428 | Invalid Data Received From Steering Angle Sensor Module | |
| U0429 | Invalid Data Received From Steering Column Control Module | |
| U042A | ISO/SAE Reserved | |
| U042B | ISO/SAE Reserved | |
| U042C | ISO/SAE Reserved | |
| U042D | ISO/SAE Reserved | |
| U042E | ISO/SAE Reserved | |
| U042F | ISO/SAE Reserved | |
| U0430 | Invalid Data Received From Tire Pressure Monitor Module | |
| U0431 | Invalid Data Received From Body Control Module "A" | |
| U0432 | Invalid Data Received From Multi-axis Acceleration Sensor Module | |
| U0433 | Invalid Data Received From Cruise Control Front Distance Range Sensor | Single Sensor or Center |
| U0434 | Invalid Data Received From Active Roll Control Module | |
| U0435 | Invalid Data Received From Power Steering Control Module | Rear |
| U0436 | Invalid Data Received From Differential Control Module | Front |
| U0437 | Invalid Data Received From Differential Control Module | Rear |
| U0438 | Invalid Data Received From Trailer Brake Control Module | |
| U0439 | Invalid Data Received From All Terrain Control Module | |
| U043A | Invalid Data Received From Suspension Control Module "B" | |
| U043B | Invalid Data Received From Cruise Control Front Distance Range | Left |
| U043C | Invalid Data Received From Cruise Control Front Distance Range Sensor | Right |
| U043D | ISO/SAE Reserved | |
| U043E | ISO/SAE Reserved | |
| U043F | ISO/SAE Reserved | |
| U0440 | ISO/SAE Reserved | |
| U0441 | Invalid Data Received From Emissions Critical Control Information | |
| U0442 | Invalid Data Received From ECM/PCM "B" | |
| U0443 | Invalid Data Received From Body Control Module "B" | |
| U0444 | Invalid Data Received From Body Control Module "C" | |
| U0445 | Invalid Data Received From Body Control Module "D" | |
| U0446 | Invalid Data Received From Body Control Module "E" | |
| U0447 | Invalid Data Received From Gateway "A" | |
| U0448 | Invalid Data Received From Gateway "B" | |
| U0449 | Invalid Data Received From Gateway "C" | |
| U044A | Invalid Data Received From Gateway "D" | |
| U044B | ISO/SAE Reserved | |
| U044C | ISO/SAE Reserved | |
| U044D | ISO/SAE Reserved | |
| U044E | ISO/SAE Reserved | |
| U044F | ISO/SAE Reserved | |
| U0450 | ISO/SAE Reserved | |
| U0451 | Invalid Data Received From Gateway "E" | |
| U0452 | Invalid Data Received From Restraints Control Module | |
| U0453 | Invalid Data Received From Side Restraints Control Module | Left |
| U0454 | Invalid Data Received From Side Restraints Control Module | Right |
| U0455 | Invalid Data Received From Restraints Occupant Classification System Module | |
| U0456 | Invalid Data Received From Coolant Temperature Control Module | |
| U0457 | Invalid Data Received From Information Center "A" | |
| U0458 | Invalid Data Received From Information Center "B" | |
| U0459 | Invalid Data Received From Head Up Display | |
| U045A | Invalid Data Received From Parking Assist Control Module "A" | |
| U045B | ISO/SAE Reserved | |
| U045C | ISO/SAE Reserved | |
| U045D | ISO/SAE Reserved | |
| U045E | ISO/SAE Reserved | |
| U045F | ISO/SAE Reserved | |
| U0460 | ISO/SAE Reserved | |
| U0461 | Invalid Data Received From Audible Alert Control Module | |
| U0462 | Invalid Data Received From Compass Module | |
| U0463 | Invalid Data Received From Navigation Display Module | |
| U0464 | Invalid Data Received From Navigation Control Module | |
| U0465 | Invalid Data Received From PTO Control Module | |
| U0466 | Invalid Data Received From HVAC Control Module | Rear |
| U0467 | Invalid Data Received From Fuel Additive Control Module | |
| U0468 | Invalid Data Received From Fuel Cell Control Module | |
| U0469 | Invalid Data Received From Starter / Generator Control Module | |
| U046A | Invalid Data Received From Sunroof Control Module | |
| U046B | Invalid Data Received From Global Positioning System Module | |
| U046C | ISO/SAE Reserved | |
| U046D | ISO/SAE Reserved | |
| U046E | ISO/SAE Reserved | |
| U046F | ISO/SAE Reserved | |
| U0470 | ISO/SAE Reserved | |
| U0471 | Invalid Data Received From "Restraints System Sensor A" | |
| U0472 | Invalid Data Received From "Restraints System Sensor B" | |
| U0473 | Invalid Data Received From "Restraints System Sensor C" | |
| U0474 | Invalid Data Received From "Restraints System Sensor D" | |
| U0475 | Invalid Data Received From "Restraints System Sensor E" | |
| U0476 | Invalid Data Received From "Restraints System Sensor F" | |
| U0477 | Invalid Data Received From "Restraints System Sensor G" | |
| U0478 | Invalid Data Received From "Restraints System Sensor H" | |
| U0479 | Invalid Data Received From "Restraints System Sensor I" | |
| U047A | Invalid Data Received From "Restraints System Sensor J" | |
| U047B | Invalid Data Received From "Restraints System Sensor K" | |
| U047C | Invalid Data Received From "Restraints System Sensor L" | |
| U047D | Invalid Data Received From "Restraints System Sensor M" | |
| U047E | Invalid Data Received From "Restraints System Sensor N" | |
| U047F | Invalid Data Received From Seatbelt Pretensioner Module "A" | |
| U0480 | Invalid Data Received From Seatbelt Pretensioner Module "B" | |
| U0481 | Invalid Data Received From Automatic Lighting Control Module | |
| U0482 | Invalid Data Received From Headlamp Leveling Control Module | |
| U0483 | Invalid Data Received From Lighting Control Module | Front |
| U0484 | Invalid Data Received From Lighting Control Module | Rear "A" |
| U0485 | Invalid Data Received From Radio | |
| U0486 | Invalid Data Received From Antenna Control Module | |
| U0487 | Invalid Data Received From Audio Amplifier "A" | |
| U0488 | Invalid Data Received From Digital Disc Player/Changer Module "A" | |
| U0489 | Invalid Data Received From Digital Disc Player/Changer Module "B" | |
| U048A | Invalid Data Received From Digital Disc Player/Changer Module "C" | |
| U048B | ISO/SAE Reserved | |
| U048C | ISO/SAE Reserved | |
| U048D | ISO/SAE Reserved | |
| U048E | ISO/SAE Reserved | |
| U048F | ISO/SAE Reserved | |
| U0490 | ISO/SAE Reserved | |
| U0491 | Invalid Data Received From Digital Disc Player/Changer Module "D" | |
| U0492 | Invalid Data Received From Television | |
| U0493 | Invalid Data Received From Personal Computer | |
| U0494 | Invalid Data Received From "Digital Audio Control Module A" | |
| U0495 | Invalid Data Received From "Digital Audio Control Module B" | |
| U0496 | Invalid Data Received From Subscription Entertainment Receiver Module | |
| U0497 | Invalid Data Received From Entertainment Control Module | Rear "A" |
| U0498 | Invalid Data Received From Telephone Control Module | |
| U0499 | Invalid Data Received From Telematic Control Module | |
| U049A | Invalid Data Received From "Door Control Module A" | |
| U049B – U04FF | ISO/SAE Reserved | |
| U0500 | ISO/SAE Reserved | |
| U0501 | Invalid Data Received From "Door Control Module B" | |
| U0502 | Invalid Data Received From "Door Control Module C" | |
| U0503 | Invalid Data Received From "Door Control Module D" | |
| U0504 | Invalid Data Received From "Door Control Module E" | |
| U0505 | Invalid Data Received From "Door Control Module F" | |
| U0506 | Invalid Data Received From "Door Control Module G" | |
| U0507 | Invalid Data Received From Folding Top Control Module | |
| U0508 | Invalid Data Received From Moveable Roof Control Module | |
| U0509 | Invalid Data Received From "Seat Control Module A" | |
| U050A | Invalid Data Received From "Seat Control Module B" | |
| U050B | ISO/SAE Reserved | |
| U050C | ISO/SAE Reserved | |
| U050D | ISO/SAE Reserved | |
| U050E | ISO/SAE Reserved | |
| U050F | ISO/SAE Reserved | |
| U0510 | ISO/SAE Reserved | |
| U0511 | Invalid Data Received From "Seat Control Module C" | |
| U0512 | Invalid Data Received From "Seat Control Module D" | |
| U0513 | Invalid Data Received From Yaw Rate Sensor Module | |
| U0514 | Invalid Data Received From Mirror Control Module | |
| U0515 | Invalid Data Received From Remote Function Actuation | |
| U0516 | Invalid Data Received From "Door Switch A" | |
| U0517 | Invalid Data Received From "Door Switch B" | |
| U0518 | Invalid Data Received From "Door Switch C" | |
| U0519 | Invalid Data Received From "Door Switch D" | |
| U051A | Invalid Data Received From "Door Switch E" | |
| U051B | ISO/SAE Reserved | |
| U051C | ISO/SAE Reserved | |
| U051D | ISO/SAE Reserved | |
| U051E | ISO/SAE Reserved | |
| U051F | ISO/SAE Reserved | |
| U0520 | ISO/SAE Reserved | |
| U0521 | Invalid Data Received From "Door Switch F" | |
| U0522 | Invalid Data Received From "Door Switch G" | |
| U0523 | Invalid Data Received From "Door Window Motor A" | |
| U0524 | Invalid Data Received From "Door Window Motor B" | |
| U0525 | Invalid Data Received From "Door Window Motor C" | |
| U0526 | Invalid Data Received From "Door Window Motor D" | |
| U0527 | Invalid Data Received From "Door Window Motor E" | |
| U0528 | Invalid Data Received From "Door Window Motor F" | |
| U0529 | Invalid Data Received From "Door Window Motor G" | |
| U052A | Invalid Data Received From Heated Steering Wheel Module | |
| U052B | ISO/SAE Reserved | |
| U052C | ISO/SAE Reserved | |
| U052D | ISO/SAE Reserved | |
| U052E | ISO/SAE Reserved | |
| U052F | ISO/SAE Reserved | |
| U0530 | ISO/SAE Reserved | |
| U0531 | Invalid Data Received From Rear Gate Module | |
| U0532 | Invalid Data Received From Rain Sensing Module | |
| U0533 | Invalid Data Received From Side Obstacle Detection Control Module | Left |
| U0534 | Invalid Data Received From Side Obstacle Detection Control Module | Right |
| U0535 | Invalid Data Received From Convenience Recall Module | |
| U0536 | Invalid Data Received From Lateral Acceleration Sensor Module | |
| U0537 | Invalid Data Received From Column Lock Module | |
| U0538 | Invalid Data Received From "Digital Audio Control Module C" | |
| U0539 | Invalid Data Received From "Digital Audio Control Module D" | |
| U053A | Invalid Data Received From Entrapment Control Module "A" | |
| U053B | Invalid Data Received From Image Processing Module "A" | |
| U053C | Invalid Data Received From Image Processing Module "B" | |
| U053D | Invalid Data Received From Image Processing Module "C" | |
| U053E | ISO/SAE Reserved | |
| U053F | ISO/SAE Reserved | |
| U0540 | ISO/SAE Reserved | |
| U0541 | Invalid Data Received From Entrapment Control Module "B" | |
| U0542 | Invalid Data Received From Headlamp Control Module "A" | |
| U0543 | Invalid Data Received From Headlamp Control Module "B" | |
| U0544 | Invalid Data Received From Parking Assist Control Module "B" | |
| U0545 | Invalid Data Received From Running Board Control Module | |
| U0546 | Invalid Data Received From Entertainment Control Module | Front |
| U0547 | Invalid Data Received From "Seat Control Module E" | |
| U0548 | Invalid Data Received From "Seat Control Module F" | |
| U0549 | Invalid Data Received From Remote Accessory Module | |
| U054A | Invalid Data Received From Entertainment Control Module | Rear "B" |
| U054B | Invalid Data Received From Interior Lighting Control Module | |
| U054C | ISO/SAE Reserved | |
| U054D | ISO/SAE Reserved | |
| U054E | ISO/SAE Reserved | |
| U054F | ISO/SAE Reserved | |
| U0550 | ISO/SAE Reserved | |
| U0551 | Invalid Data Received From Impact Classification System Module | |
| U0552 | Invalid Data Received From Running Board Control Module "B" | |
| U0553 | Invalid Data Received From Lighting Control Module | Rear "B" |
| U0554 | Invalid Data Received From Accessory Protocol Interface Module | |
| U0555 | Invalid Data Received From Remote Start Module | |
| U0556 | Invalid Data Received From Front Display Interface Module | |
| U0557 | Invalid Data Received From Front Controls Interface Module "A" | |
| U0558 | Invalid Data Received From Front Controls/Display Interface Module | |
| U0559 | Invalid Data Received From Radio Transceiver | |
| U055A | Invalid Data Received From Special Purpose Vehicle Control Module "A" | |
| U055B | Invalid Data Received From Special Purpose Vehicle Control Module "B" | |
| U055C | Invalid Data Received From Special Purpose Vehicle Control Module "C" | |
| U055D | Invalid Data Received From Special Purpose Vehicle Control Module "D" | |
| U055E | Invalid Data Received From Front Controls Interface Module "B" | |
| U055F | ISO/SAE Reserved | |
| U0560 | ISO/SAE Reserved | |
| U0561 | Invalid Data Received From Seat Control Switch Module "A" | |
| U0562 | Invalid Data Received From Seat Control Switch Module "B" | |
| U0563 | Invalid Data Received From Audio Amplifier "B" | |
| U0564 | Invalid Data Received From Speech Recognition Module | |
| U0565 | Invalid Data Received From Camera Module | |
| U0566 | ISO/SAE Reserved | |
| U0567 | ISO/SAE Reserved | |
| U0568 | ISO/SAE Reserved | |
| U0569 | ISO/SAE Reserved | |
| U056A | ISO/SAE Reserved | |
| U056B | ISO/SAE Reserved | |
| U056C | ISO/SAE Reserved | |
| U056D | ISO/SAE Reserved | |
| U056E | ISO/SAE Reserved | |
| U056F | ISO/SAE Reserved | |
| U0570 | ISO/SAE Reserved | |
| U0571 | ISO/SAE Reserved | |
| U0572 | ISO/SAE Reserved | |
| U0573 | ISO/SAE Reserved | |
| U0574 | ISO/SAE Reserved | |
| U0575 | ISO/SAE Reserved | |
| U0576 | ISO/SAE Reserved | |
| U0577 | ISO/SAE Reserved | |
| U0578 | ISO/SAE Reserved | |
| U0579 | ISO/SAE Reserved | |
| U057A | ISO/SAE Reserved | |
| U057B | ISO/SAE Reserved | |
| U057C | ISO/SAE Reserved | |
| U057D | ISO/SAE Reserved | |
| U057E | ISO/SAE Reserved | |
| U057F | ISO/SAE Reserved | |
| U0580 | ISO/SAE Reserved | |
| U0581 | ISO/SAE Reserved | |
| U0582 | ISO/SAE Reserved | |
| U0583 | ISO/SAE Reserved | |
| U0584 | ISO/SAE Reserved | |
| U0585 | ISO/SAE Reserved | |
| U0586 | ISO/SAE Reserved | |
| U0587 | Invalid Data Received From With Radiator Anti Tamper Device | |
| U0588 | Invalid Data Received From Transmission Fluid Pump Module | |
| U0589 | Invalid Data Received From DC to AC Converter Control Module "A" | |
| U058A | Invalid Data Received From DC to AC Converter Control Module "B" | |
| U058B | ISO/SAE Reserved | |
| U058C | ISO/SAE Reserved | |
| U058D | ISO/SAE Reserved | |
| U058E | ISO/SAE Reserved | |
| U058F | ISO/SAE Reserved | |
| U0590 | ISO/SAE Reserved | |
| U0591 | ISO/SAE Reserved | |
| U0592 | Invalid Data Received From Gear Shift Control Module "B" | |
| U0593 | Invalid Data Received From Drive Motor Control Module "B" | |
| U0594 | Invalid Data Received From Hybrid Powertrain Control Module | |
| U0595 | Invalid Data Received From Powertrain Control Monitor Module | |
| U0596 | Invalid Data Received From AC to AC Converter Control Module | |
| U0597 | Invalid Data Received From AC to DC Converter Control Module "A" | |
| U0598 | Invalid Data Received From AC to DC Converter Control Module "B" | |
| U0599 | Invalid Data Received From DC to DC Converter Control Module "A" | |
| U059A | Invalid Data Received From DC to DC Converter Control Module "B" | |
| U059B | Invalid Data Received From Hybrid Battery Pack Sensor Module | |
| U059C | Invalid Data Received From Drive Motor Control Module "C" | |
| U059D | Invalid Data Received From Drive Motor Control Module "D" | |
| U059E | Invalid Data Received From NOX Sensor "A" | |
| U059F | Invalid Data Received From NOX Sensor "B" | |
| U05A0 – U05FF | ISO/SAE Reserved | |
| U0600 | ISO/SAE Reserved | |
| U1000 | Manufacturer Controlled DTC | |
| U2000 | Manufacturer Controlled DTC | |
| U3000 | Control Module | |
| U3001 | Control Module Improper Shutdown | |
| U3002 | Vehicle Identification Number | |
| U3003 | Battery Voltage | |
| U3004 | Accessory Power Relay | |
| U3005 | Retained Accessory Power | |
| U3006 | Control Module Input Power "A" | |
| U3007 | Control Module Input Power "B" | |
| U3008 | Control Module Ground "A" | |
| U3009 | Control Module Ground "B" | |
| U300A | Ignition Switch | |
| U300B | Ignition Input Accessory/On/Start | |
| U300C | Ignition Input Off/On/Start | |
| U300D | Ignition Input On/Start | |
| U300E | Ignition Input On | |
| U300F | Ignition Input Accessory | |
| U3010 | Ignition Input Start | |
| U3011 | Ignition Input Off | |
| U3012 – U30FF | ISO/SAE Reserved | |
| U3100 | ISO/SAE Reserved |