THE CODE DIRECTORY
Diagnostic code references — Page 111.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
U02A4
Lost Communication With NH3 Sensor
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Generic OBD-II
U02A5
Lost Communication With Reductant Heater Control Module
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Generic OBD-II
U02A6
Lost Communication With Safety Integration Control Module
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Generic OBD-II
U02A7
Lost Communication With Engine Sound Control 1
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Generic OBD-II
U02A8
Lost Communication With Engine Sound Control 2
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Generic OBD-II
U02A9
Lost Communication With Charge Air Cooler Coolant Pump A
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Generic OBD-II
U02AA
Lost Communication With Engine Disconnect Clutch
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Generic OBD-II
U02AB
Lost Communication With Vehicle Thermal Management Control Module
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Generic OBD-II
U02AC
Lost Communication With Turbocharger/Supercharger Boost Control A
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Generic OBD-II
U02AD
Lost Communication With Turbocharger/Supercharger Boost Control B
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Generic OBD-II
U02AE
Lost Communications With Hybrid/EV Battery Coolant Pump
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Generic OBD-II
U02AF
Lost Communication With Turbocharger Turbine Inlet Valve Position Sensor
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Generic OBD-II
U02B0
Lost Communication With Turbocharger/Supercharger Boost Control B Position Sensor
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Generic OBD-II
U02B1
Lost Communication With Comfort and Convenience Display A
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Generic OBD-II
U02B2
Lost Communication With Comfort and Convenience Display B
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Generic OBD-II
U02B3
Lost Communication With Driver Monitoring System Module
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Generic OBD-II
U02B4
Lost Communication With Front Radar Module A
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Generic OBD-II
U02B5
Lost Communication With Front Radar Module B
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Generic OBD-II
U02B6
Lost Communication With Rear Radar Module A
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Generic OBD-II
U02B7
Lost Communication With Rear Radar Module B
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Generic OBD-II
U02B8
Lost Communication With Rear Radar Module C
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Generic OBD-II
U02B9
Lost Communication With Rear Radar Module D
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Generic OBD-II
U02BA
Lost Communication With Hybrid/EV Electronics Coolant Pump B
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Generic OBD-II
U02BB
Lost Communications with EVAP System Purge Pump
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Generic OBD-II
U02BC
Lost Communication With Localization and Mapping Module
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Generic OBD-II
U02BD
Lost Communication With Night Vision Control Module
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Generic OBD-II
U02BE
Lost Communication With Trailer Backup Assist Control Module
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Generic OBD-II
U02BF
Lost Communication With Interior Lighting Control Module B
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Generic OBD-II
U02C0
Lost Communication With Active Radiator Air Flow Control Module A
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Generic OBD-II
U02C1
Lost Communication With Hybrid/EV Electronics Coolant Pump C
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Generic OBD-II
U0300
Internal Control Module Software Incompatibility
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Generic OBD-II
U0301
Software Incompatibility With ECM/PCM
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Generic OBD-II
U0302
Software Incompatibility With Transmission Control Module
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Generic OBD-II
U0303
Software Incompatibility With Transfer Case Control Module
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Generic OBD-II
U0304
Software Incompatibility With Gear Shift Control Module A
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Generic OBD-II
U0305
Software Incompatibility With Cruise Control Module
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Generic OBD-II
U0306
Software Incompatibility With Fuel Injector Control Module
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Generic OBD-II
U0307
Software Incompatibility With Glow Plug Control Module 1
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Generic OBD-II
U0308
Software Incompatibility With Throttle Actuator Control Module
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Generic OBD-II
U0309
Software Incompatibility With Alternative Fuel Control Module
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Generic OBD-II
U030A
Software Incompatibility With Evaporative Emission System Leak Detection Control Module
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Generic OBD-II
U030B
Software Incompatibility With Glow Plug Control Module 2
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Generic OBD-II
U030C
Software Incompatibility With Reductant Quality Module
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Generic OBD-II
U030D
Software Incompatibility With NOx Sensor A
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Generic OBD-II
U030E
Software Incompatibility With NOx Sensor B
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Generic OBD-II
U030F
Software Incompatibility With Reductant Control Module
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Generic OBD-II
U0310
Software Incompatibility With Fuel Pump Control Module
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Generic OBD-II
U0311
Software Incompatibility With Drive Motor Control Module
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Generic OBD-II
U0312
Software Incompatibility With Battery Energy Control Module A
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Generic OBD-II
U0313
Software Incompatibility With Battery Energy Control Module B
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Generic OBD-II
U0314
Software Incompatibility With Four-Wheel Drive Clutch Control Module
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Generic OBD-II
U0315
Software Incompatibility With Anti-Lock Brake System (ABS) Control Module
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Generic OBD-II
U0316
Software Incompatibility With Vehicle Dynamics Control Module
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Generic OBD-II
U0317
Software Incompatibility With Park Brake Control Module
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Generic OBD-II
U0318
Software Incompatibility With Brake System Control Module A
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Generic OBD-II
U0319
Software Incompatibility With Steering Effort Control Module
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Generic OBD-II
U031A
Software Incompatibility With Transmission Range Control Module
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Generic OBD-II
U031B
Software Incompatibility With DC/DC Converter Control Module A
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Generic OBD-II
U031C
Software Incompatibility With Brake System Control Module B
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Generic OBD-II
U031D
Software Incompatibility With Parking Assist Control Module A
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Generic OBD-II
U031E
Software Incompatibility With Parking Assist Control Module B
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Generic OBD-II
U031F
Software Incompatibility With Accessory Protocol Interface Module
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Generic OBD-II
U0320
Software Incompatibility With Power Steering Control Module
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Generic OBD-II
U0321
Software Incompatibility With Suspension Control Module A
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Generic OBD-II
U0322
Software Incompatibility With Body Control Module
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Generic OBD-II
U0323
Software Incompatibility With Instrument Panel Control Module
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Generic OBD-II
U0324
Software Incompatibility With HVAC Control Module
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Generic OBD-II
U0325
Software Incompatibility With Auxiliary Heater Control Module
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Generic OBD-II
U0326
Software Incompatibility With Vehicle Immobilizer Control Module
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Generic OBD-II
U0327
Software Incompatibility With Vehicle Security Control Module
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Generic OBD-II
U0328
Software Incompatibility With Steering Angle Sensor Module
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Generic OBD-II
U0329
Software Incompatibility With Steering Column Control Module
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Generic OBD-II
U032A
Software Incompatibility With A/C Compressor Control Module
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Generic OBD-II
U0330
Software Incompatibility With Tire Pressure Monitor Module
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Generic OBD-II
U0331
Software Incompatibility With Body Control Module A
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Generic OBD-II
U0332
Software Incompatibility With Multi-axis Acceleration Sensor Module A
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Generic OBD-II
U0333
Software Incompatibility With Gear Shift Control Module B
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Generic OBD-II
U0334
Software Incompatibility With Radio
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Generic OBD-II
U0335
Software Incompatibility With Hybrid/EV Battery Pack Sensor Module
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Generic OBD-II
U0336
Software Incompatibility With Restraints Control Module
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Generic OBD-II
U0337
Software Incompatibility With Battery Charger Control Module A
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Generic OBD-II
U0338
Software Incompatibility With Remote Function Actuation Module
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Generic OBD-II
U0339
Software Incompatibility With Body Control Module B
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Generic OBD-II
U033A
Software Incompatibility With Hybrid/EV Battery Interface Control Module A
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Generic OBD-II
U033B
Software Incompatibility With Hybrid/EV Battery Interface Control Module B
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Generic OBD-II
U033C
Software Incompatibility With Hybrid/EV Battery Interface Control Module C
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Generic OBD-II
U033D
Software Incompatibility With Hybrid/EV Battery Interface Control Module D
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Generic OBD-II
U033E
Software Incompatibility With Hybrid/EV Battery Interface Control Module E
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Generic OBD-II
U033F
Software Incompatibility With Hybrid/EV Battery Interface Control Module F
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Generic OBD-II
U0340
Software Incompatibility With Hybrid/EV Battery Interface Control Module G
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Generic OBD-II
U0341
Software Incompatibility With Hybrid/EV Battery Interface Control Module H
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Generic OBD-II
U0342
Software Incompatibility With Hybrid/EV Battery Interface Control Module I
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Generic OBD-II
U0343
Software Incompatibility With Hybrid/EV Battery Interface Control Module J
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Generic OBD-II
U0344
Software Incompatibility With Hybrid/EV Battery Interface Control Module K
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Generic OBD-II
U0345
Software Incompatibility With Hybrid/EV Battery Interface Control Module L
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Generic OBD-II
U0346
Software Incompatibility With Hybrid/EV Battery Interface Control Module M
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Generic OBD-II
U0347
Software Incompatibility With Hybrid/EV Battery Interface Control Module N
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Generic OBD-II
U0348
Software Incompatibility With Hybrid/EV Battery Interface Control Module O
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Generic OBD-II
U0349
Software Incompatibility With Hybrid/EV Battery Interface Control Module P
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Generic OBD-II
U034A
Software Incompatibility With Engine Disconnect Clutch
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These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.