Diagnostic library

Find an OBD2 code

Search the code from your scanner, then narrow the library by system, severity, or code family.

9,253 diagnostic guides

Sort

Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh gear changesDelayed or rough shifting

A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.

Quick browse

Choose a vehicle system

Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

FiltersSeverity · family

Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

Vehicle coverage

These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 9241–9253 of 9253

Most searched first

U0136Lost Communication With Rear Differential Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0136 means Lost Communication With Rear Differential Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0137Lost Communication With Trailer Brake Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0137 means Lost Communication With Trailer Brake Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0138Lost Communication With All-Terrain Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0138 means Lost Communication With All-Terrain Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0139Lost Communication With Suspension Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0139 means Lost Communication With Suspension Control Module B. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0141Lost Communication With Body Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0141 means Lost Communication With Body Control Module A. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0142Lost Communication With Body Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0142 means Lost Communication With Body Control Module B. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0143Lost Communication With Body Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0143 means Lost Communication With Body Control Module C. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0144Lost Communication With Body Control Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0144 means Lost Communication With Body Control Module D. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0145Lost Communication With Body Control Module ECheck soonNetwork & Communication45–120 minutes for initial diagnosisU0145 means Lost Communication With Body Control Module E. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0147Lost Communication With Gateway BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0147 means Lost Communication With Gateway B. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0148Lost Communication With Gateway CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0148 means Lost Communication With Gateway C. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0149Lost Communication With Gateway DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0149 means Lost Communication With Gateway D. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0150Lost Communication With Gateway ECheck soonNetwork & Communication45–120 minutes for initial diagnosisU0150 means Lost Communication With Gateway E. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.