U03xx codes: Network codes U0300-U0399
80 network trouble codes from U0300 to U0354. They mostly involve the control module software, ECM, control module and TCM.
All U03xx codes
20 of these codes usually turn on the check engine light; 0 can often be fixed at home.
| Code | Meaning | Difficulty |
|---|---|---|
| U0300 | Internal Control Module Software Incompatibility | Workshop only |
| U0301 | Software Incompatibility With ECM/PCM | Workshop only |
| U0302 | Software Incompatibility With Transmission Control Module | Workshop only |
| U0303 | Software Incompatibility With Transfer Case Control Module | Workshop only |
| U0304 | Software Incompatibility With Gear Shift Control Module | Workshop only |
| U0305 | Software Incompatibility With Cruise Control Module | Workshop only |
| U0306 | Software Incompatibility With Fuel Injector Control Module | Workshop only |
| U0307 | Software Incompatibility With Glow Plug Control Module 1 | Workshop only |
| U0308 | Software Incompatibility With Throttle Actuator Control Module | Workshop only |
| U0309 | Software Incompatibility With Alternative Fuel Control Module | Workshop only |
| U030A | Software Incompatibility With Evaporative Emission System Leak Detection Control Module | Hard |
| U030B | Software Incompatibility With Glow Plug Control Module 2 | Workshop only |
| U030C | Software Incompatibility With Reductant Quality Module | Workshop only |
| U030D | Software Incompatibility With NOx Sensor A | Medium |
| U030E | Software Incompatibility With NOx Sensor B | Medium |
| U030F | Software Incompatibility With Reductant Control Module | Workshop only |
| U0310 | Software Incompatibility With Fuel Pump Control Module | Workshop only |
| U0311 | Software Incompatibility With Drive Motor Control Module | Workshop only |
| U0312 | Software Incompatibility With Battery Energy Control Module A | Workshop only |
| U0313 | Software Incompatibility With Battery Energy Control Module B | Workshop only |
| U0314 | Software Incompatibility With Four-Wheel Drive Clutch Control Module | Workshop only |
| U0315 | Software Incompatibility With Anti-Lock Brake System (ABS) Control Module | Workshop only |
| U0316 | Software Incompatibility With Vehicle Dynamics Control Module | Workshop only |
| U0317 | Software Incompatibility With Park Brake Control Module | Workshop only |
| U0318 | Software Incompatibility With Brake System Control Module | Workshop only |
| U0319 | Software Incompatibility With Steering Effort Control Module | Workshop only |
| U031A | Software Incompatibility With Transmission Range Control Module | Workshop only |
| U031B | Software Incompatibility With DC/DC Converter Control Module A | Workshop only |
| U031C | Software Incompatibility With Brake System Control Module B | Workshop only |
| U031D | Software Incompatibility With Parking Assist Control Module A | Workshop only |
| U031E | Software Incompatibility With Parking Assist Control Module B | Workshop only |
| U031F | Software Incompatibility With Accessory Protocol Interface Module | Workshop only |
| U0320 | Software Incompatibility With Power Steering Control Module | Workshop only |
| U0321 | Software Incompatibility With Suspension Control Module A | Workshop only |
| U0322 | Software Incompatibility With Body Control Module | Workshop only |
| U0323 | Software Incompatibility With Instrument Panel Control Module | Medium |
| U0324 | Software Incompatibility With HVAC Control Module | Workshop only |
| U0325 | Software Incompatibility With Auxiliary Heater Control Module | Workshop only |
| U0326 | Software Incompatibility With Vehicle Immobilizer Control Module | Workshop only |
| U0327 | Software Incompatibility With Vehicle Security Control Module | Workshop only |
| U0328 | Software Incompatibility With Steering Angle Sensor Module | Workshop only |
| U0329 | Software Incompatibility With Steering Column Control Module | Workshop only |
| U032A | Software Incompatibility With A/C Compressor Control Module | Workshop only |
| U0330 | Software Incompatibility With Tire Pressure Monitor Module | Workshop only |
| U0331 | Software Incompatibility With Body Control Module A | Workshop only |
| U0332 | Software Incompatibility With Multi-axis Acceleration Sensor Module A | Workshop only |
| U0333 | Software Incompatibility With Gear Shift Control Module B | Workshop only |
| U0334 | Software Incompatibility With Radio | Workshop only |
| U0335 | Software Incompatibility With Hybrid/EV Battery Pack Sensor Module | Workshop only |
| U0336 | Software Incompatibility With Restraints Control Module | Workshop only |
| U0337 | Software Incompatibility With Battery Charger Control Module A | Workshop only |
| U0338 | Software Incompatibility With Remote Function Actuation Module | Workshop only |
| U0339 | Software Incompatibility With Body Control Module B | Workshop only |
| U033A | Software Incompatibility With Hybrid/EV Battery Interface Control Module A | Workshop only |
| U033B | Software Incompatibility With Hybrid/EV Battery Interface Control Module B | Workshop only |
| U033C | Software Incompatibility With Hybrid/EV Battery Interface Control Module C | Workshop only |
| U033D | Software Incompatibility With Hybrid/EV Battery Interface Control Module D | Workshop only |
| U033E | Software Incompatibility With Hybrid/EV Battery Interface Control Module E | Workshop only |
| U033F | Software Incompatibility With Hybrid/EV Battery Interface Control Module F | Workshop only |
| U0340 | Software Incompatibility With Hybrid/EV Battery Interface Control Module G | Workshop only |
| U0341 | Software Incompatibility With Hybrid/EV Battery Interface Control Module H | Workshop only |
| U0342 | Software Incompatibility With Hybrid/EV Battery Interface Control Module I | Workshop only |
| U0343 | Software Incompatibility With Hybrid/EV Battery Interface Control Module J | Workshop only |
| U0344 | Software Incompatibility With Hybrid/EV Battery Interface Control Module K | Workshop only |
| U0345 | Software Incompatibility With Hybrid/EV Battery Interface Control Module L | Workshop only |
| U0346 | Software Incompatibility With Hybrid/EV Battery Interface Control Module M | Workshop only |
| U0347 | Software Incompatibility With Hybrid/EV Battery Interface Control Module N | Workshop only |
| U0348 | Software Incompatibility With Hybrid/EV Battery Interface Control Module O | Workshop only |
| U0349 | Software Incompatibility With Hybrid/EV Battery Interface Control Module P | Workshop only |
| U034A | Software Incompatibility With Engine Disconnect Clutch | Workshop only |
| U034B | Software Incompatibility With Brake Booster Control | Workshop only |
| U034C | Software Incompatibility With Battery Energy Control Module C | Workshop only |
| U034D | Software Incompatibility With Vehicle Thermal Management Control Module | Workshop only |
| U034E | Software Incompatibility With Active Grille Air Shutter Module A | Medium |
| U034F | Software Incompatibility With Active Grille Air Shutter Module B | Medium |
| U0350 | Software Incompatibility With Active Grille Air Shutter Module C | Medium |
| U0351 | Software Incompatibility With Active Grille Air Shutter Module D | Medium |
| U0352 | Software Incompatibility With NOx Sensor C | Workshop only |
| U0353 | Software Incompatibility With Ion Sense Module | Workshop only |
| U0354 | Software Incompatibility With Hybrid/EV Battery Inductive Charger Control Module | Workshop only |