OBD-II · CODE FAMILY
Codes U03xx — what they mean
U03xx is a family of 80 manufacturer-specific OBD2 codes covering network and electrical faults. Each U03xx code below links to its own page with causes, diagnosis and the parts to fix it.
80 codesNetwork systems
FAMILY
RangeU0300–U0354
Codes80
TROUBLEATLAS APP
01All codes in this family
One rich, indexed page — not thousands of empty ones. Each code links to its own page.
| Code | Meaning — click to open the code page | System | Severity |
|---|---|---|---|
| U0300 | OBD II fault code U0300 is a generic trouble code that is de → /auto/codes/u0300/ OBD II fault code U0300 is a generic trouble code that is defined as U0300 – “Control Module – Internal Software Incompatibility” and is set when the | Network | Medium |
| U0301 | OBD II fault code U0301 is a generic trouble code that is de → /auto/codes/u0301/ OBD II fault code U0301 is a generic trouble code that is defined as “Software Incompatibility With ECM/PCM”, and is set when the PCM (Powertrain Cont | Network | Medium |
| U0302 | Software Incompatibility With Transmission Control Module → /auto/codes/u0302/ Software Incompatibility With Transmission Control Module | Network | Medium |
| U0303 | Software Incompatibility With Transfer Case Control Module → /auto/codes/u0303/ Software Incompatibility With Transfer Case Control Module | Network | Medium |
| U0304 | Software Incompatibility With Gear Shift Control Module A → /auto/codes/u0304/ Software Incompatibility With Gear Shift Control Module A | Network | Medium |
| U0305 | Software Incompatibility With Cruise Control Module → /auto/codes/u0305/ Software Incompatibility With Cruise Control Module | Network | Medium |
| U0306 | Software Incompatibility With Fuel Injector Control Module → /auto/codes/u0306/ Software Incompatibility With Fuel Injector Control Module | Network | Medium |
| U0307 | Software Incompatibility With Glow Plug Control Module 1 → /auto/codes/u0307/ Software Incompatibility With Glow Plug Control Module 1 | Network | Medium |
| U0308 | Software Incompatibility With Throttle Actuator Control Modu → /auto/codes/u0308/ Software Incompatibility With Throttle Actuator Control Module | Network | Medium |
| U0309 | Software Incompatibility With Alternative Fuel Control Modul → /auto/codes/u0309/ Software Incompatibility With Alternative Fuel Control Module | Network | Medium |
| U030A | Software Incompatibility With Evaporative Emission System Le → /auto/codes/u030a/ Software Incompatibility With Evaporative Emission System Leak Detection Control Module | Network | Medium |
| U030B | Software Incompatibility With Glow Plug Control Module 2 → /auto/codes/u030b/ Software Incompatibility With Glow Plug Control Module 2 | Network | Medium |
| U030C | Software Incompatibility With Reductant Quality Module → /auto/codes/u030c/ Software Incompatibility With Reductant Quality Module | Network | Medium |
| U030D | Software Incompatibility With NOx Sensor A → /auto/codes/u030d/ Software Incompatibility With NOx Sensor A | Network | Medium |
| U030E | Software Incompatibility With NOx Sensor B → /auto/codes/u030e/ Software Incompatibility With NOx Sensor B | Network | Medium |
| U030F | Software Incompatibility With Reductant Control Module → /auto/codes/u030f/ Software Incompatibility With Reductant Control Module | Network | Medium |
| U0310 | Software Incompatibility With Fuel Pump Control Module → /auto/codes/u0310/ Software Incompatibility With Fuel Pump Control Module | Network | Medium |
| U0311 | Software Incompatibility With Drive Motor Control Module → /auto/codes/u0311/ Software Incompatibility With Drive Motor Control Module | Network | Medium |
| U0312 | Software Incompatibility With Battery Energy Control Module → /auto/codes/u0312/ Software Incompatibility With Battery Energy Control Module A | Network | Medium |
| U0313 | Software Incompatibility With Battery Energy Control Module → /auto/codes/u0313/ Software Incompatibility With Battery Energy Control Module B | Network | Medium |
| U0314 | Software Incompatibility With Four-Wheel Drive Clutch Contro → /auto/codes/u0314/ Software Incompatibility With Four-Wheel Drive Clutch Control Module | Network | Medium |
| U0315 | Software Incompatibility With Anti-Lock Brake System (ABS) C → /auto/codes/u0315/ Software Incompatibility With Anti-Lock Brake System (ABS) Control Module | Network | Medium |
| U0316 | Software Incompatibility With Vehicle Dynamics Control Modul → /auto/codes/u0316/ Software Incompatibility With Vehicle Dynamics Control Module | Network | Medium |
| U0317 | Software Incompatibility With Park Brake Control Module → /auto/codes/u0317/ Software Incompatibility With Park Brake Control Module | Network | Medium |
| U0318 | Software Incompatibility With Brake System Control Module A → /auto/codes/u0318/ Software Incompatibility With Brake System Control Module A | Network | Medium |
| U0319 | Software Incompatibility With Steering Effort Control Module → /auto/codes/u0319/ Software Incompatibility With Steering Effort Control Module | Network | Medium |
| U031A | Software Incompatibility With Transmission Range Control Mod → /auto/codes/u031a/ Software Incompatibility With Transmission Range Control Module | Network | Medium |
| U031B | Software Incompatibility With DC/DC Converter Control Module → /auto/codes/u031b/ Software Incompatibility With DC/DC Converter Control Module A | Network | Medium |
| U031C | Software Incompatibility With Brake System Control Module B → /auto/codes/u031c/ Software Incompatibility With Brake System Control Module B | Network | Medium |
| U031D | Software Incompatibility With Parking Assist Control Module → /auto/codes/u031d/ Software Incompatibility With Parking Assist Control Module A | Network | Medium |
| U031E | Software Incompatibility With Parking Assist Control Module → /auto/codes/u031e/ Software Incompatibility With Parking Assist Control Module B | Network | Medium |
| U031F | Software Incompatibility With Accessory Protocol Interface M → /auto/codes/u031f/ Software Incompatibility With Accessory Protocol Interface Module | Network | Medium |
| U0320 | Software Incompatibility With Power Steering Control Module → /auto/codes/u0320/ Software Incompatibility With Power Steering Control Module | Network | Medium |
| U0321 | Software Incompatibility With Suspension Control Module A → /auto/codes/u0321/ Software Incompatibility With Suspension Control Module A | Network | Medium |
| U0322 | Software Incompatibility With Body Control Module → /auto/codes/u0322/ Software Incompatibility With Body Control Module | Network | Medium |
| U0323 | Software Incompatibility With Instrument Panel Control Modul → /auto/codes/u0323/ Software Incompatibility With Instrument Panel Control Module | Network | Medium |
| U0324 | Software Incompatibility With HVAC Control Module → /auto/codes/u0324/ Software Incompatibility With HVAC Control Module | Network | Medium |
| U0325 | Software Incompatibility With Auxiliary Heater Control Modul → /auto/codes/u0325/ Software Incompatibility With Auxiliary Heater Control Module | Network | Medium |
| U0326 | Software Incompatibility With Vehicle Immobilizer Control Mo → /auto/codes/u0326/ Software Incompatibility With Vehicle Immobilizer Control Module | Network | Medium |
| U0327 | Software Incompatibility With Vehicle Security Control Modul → /auto/codes/u0327/ Software Incompatibility With Vehicle Security Control Module | Network | Medium |
| U0328 | Software Incompatibility With Steering Angle Sensor Module → /auto/codes/u0328/ Software Incompatibility With Steering Angle Sensor Module | Network | Medium |
| U0329 | Software Incompatibility With Steering Column Control Module → /auto/codes/u0329/ Software Incompatibility With Steering Column Control Module | Network | Medium |
| U032A | Software Incompatibility With A/C Compressor Control Module → /auto/codes/u032a/ Software Incompatibility With A/C Compressor Control Module | Network | Medium |
| U0330 | Software Incompatibility With Tire Pressure Monitor Module → /auto/codes/u0330/ Software Incompatibility With Tire Pressure Monitor Module | Network | Medium |
| U0331 | Software Incompatibility With Body Control Module A → /auto/codes/u0331/ Software Incompatibility With Body Control Module A | Network | Medium |
| U0332 | Software Incompatibility With Multi-axis Acceleration Sensor → /auto/codes/u0332/ Software Incompatibility With Multi-axis Acceleration Sensor Module A | Network | Medium |
| U0333 | Software Incompatibility With Gear Shift Control Module B → /auto/codes/u0333/ Software Incompatibility With Gear Shift Control Module B | Network | Medium |
| U0334 | Software Incompatibility With Radio → /auto/codes/u0334/ Software Incompatibility With Radio | Network | Medium |
| U0335 | Software Incompatibility With Hybrid/EV Battery Pack Sensor → /auto/codes/u0335/ Software Incompatibility With Hybrid/EV Battery Pack Sensor Module | Network | Medium |
| U0336 | Software Incompatibility With Restraints Control Module → /auto/codes/u0336/ Software Incompatibility With Restraints Control Module | Network | Medium |
| U0337 | Software Incompatibility With Battery Charger Control Module → /auto/codes/u0337/ Software Incompatibility With Battery Charger Control Module A | Network | Medium |
| U0338 | Software Incompatibility With Remote Function Actuation Modu → /auto/codes/u0338/ Software Incompatibility With Remote Function Actuation Module | Network | Medium |
| U0339 | Software Incompatibility With Body Control Module B → /auto/codes/u0339/ Software Incompatibility With Body Control Module B | Network | Medium |
| U033A | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u033a/ Software Incompatibility With Hybrid/EV Battery Interface Control Module A | Network | Medium |
| U033B | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u033b/ Software Incompatibility With Hybrid/EV Battery Interface Control Module B | Network | Medium |
| U033C | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u033c/ Software Incompatibility With Hybrid/EV Battery Interface Control Module C | Network | Medium |
| U033D | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u033d/ Software Incompatibility With Hybrid/EV Battery Interface Control Module D | Network | Medium |
| U033E | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u033e/ Software Incompatibility With Hybrid/EV Battery Interface Control Module E | Network | Medium |
| U033F | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u033f/ Software Incompatibility With Hybrid/EV Battery Interface Control Module F | Network | Medium |
| U0340 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0340/ Software Incompatibility With Hybrid/EV Battery Interface Control Module G | Network | Medium |
| U0341 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0341/ Software Incompatibility With Hybrid/EV Battery Interface Control Module H | Network | Medium |
| U0342 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0342/ Software Incompatibility With Hybrid/EV Battery Interface Control Module I | Network | Medium |
| U0343 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0343/ Software Incompatibility With Hybrid/EV Battery Interface Control Module J | Network | Medium |
| U0344 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0344/ Software Incompatibility With Hybrid/EV Battery Interface Control Module K | Network | Medium |
| U0345 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0345/ Software Incompatibility With Hybrid/EV Battery Interface Control Module L | Network | Medium |
| U0346 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0346/ Software Incompatibility With Hybrid/EV Battery Interface Control Module M | Network | Medium |
| U0347 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0347/ Software Incompatibility With Hybrid/EV Battery Interface Control Module N | Network | Medium |
| U0348 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0348/ Software Incompatibility With Hybrid/EV Battery Interface Control Module O | Network | Medium |
| U0349 | Software Incompatibility With Hybrid/EV Battery Interface Co → /auto/codes/u0349/ Software Incompatibility With Hybrid/EV Battery Interface Control Module P | Network | Medium |
| U034A | Software Incompatibility With Engine Disconnect Clutch → /auto/codes/u034a/ Software Incompatibility With Engine Disconnect Clutch | Network | Medium |
| U034B | Software Incompatibility With Brake Booster Control → /auto/codes/u034b/ Software Incompatibility With Brake Booster Control | Network | Medium |
| U034C | Software Incompatibility With Battery Energy Control Module → /auto/codes/u034c/ Software Incompatibility With Battery Energy Control Module C | Network | Medium |
| U034D | Software Incompatibility With Vehicle Thermal Management Con → /auto/codes/u034d/ Software Incompatibility With Vehicle Thermal Management Control Module | Network | Medium |
| U034E | Software Incompatibility With Active Grille Air Shutter Modu → /auto/codes/u034e/ Software Incompatibility With Active Grille Air Shutter Module A | Network | Medium |
| U034F | Software Incompatibility With Active Grille Air Shutter Modu → /auto/codes/u034f/ Software Incompatibility With Active Grille Air Shutter Module B | Network | Medium |
| U0350 | Software Incompatibility With Active Grille Air Shutter Modu → /auto/codes/u0350/ Software Incompatibility With Active Grille Air Shutter Module C | Network | Medium |
| U0351 | Software Incompatibility With Active Grille Air Shutter Modu → /auto/codes/u0351/ Software Incompatibility With Active Grille Air Shutter Module D | Network | Medium |
| U0352 | Software Incompatibility With NOx Sensor C → /auto/codes/u0352/ Software Incompatibility With NOx Sensor C | Network | Medium |
| U0353 | Software Incompatibility With Ion Sense Module → /auto/codes/u0353/ Software Incompatibility With Ion Sense Module | Network | Medium |
| U0354 | Software Incompatibility With Hybrid/EV Battery Inductive Ch → /auto/codes/u0354/ Software Incompatibility With Hybrid/EV Battery Inductive Charger Control Module | Network | Medium |
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