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.

U · Network Clear all

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 169–192 of 1228

Most searched first

U0169Lost Communication With Sunroof Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0169 concerns lost communication with sunroof control module. Learn what this fault indicates and where to begin diagnosis.U016ALost Communication With Global Positioning System ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU016A concerns lost communication with global positioning system module. Learn what this fault indicates and where to begin diagnosis.U016BLost Communication With A/C Compressor Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU016B concerns lost communication with a/c compressor control module. Learn what this fault indicates and where to begin diagnosis.U016CLost Communication With Fuel Pump Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU016C concerns lost communication with fuel pump control module b. Learn what this fault indicates and where to begin diagnosis.U016DLost Communication With Exhaust Gas Sensor Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU016D concerns lost communication with exhaust gas sensor module b. Learn what this fault indicates and where to begin diagnosis.U0170Lost Communication With Restraints System Sensor ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0170 concerns lost communication with restraints system sensor a. Learn what this fault indicates and where to begin diagnosis.U0171Lost Communication With Restraints System Sensor BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0171 concerns lost communication with restraints system sensor b. Learn what this fault indicates and where to begin diagnosis.U0172Lost Communication With Restraints System Sensor CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0172 concerns lost communication with restraints system sensor c. Learn what this fault indicates and where to begin diagnosis.U0173Lost Communication With Restraints System Sensor DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0173 concerns lost communication with restraints system sensor d. Learn what this fault indicates and where to begin diagnosis.U0174Lost Communication With Restraints System Sensor ECheck soonNetwork & Communication45–120 minutes for initial diagnosisU0174 concerns lost communication with restraints system sensor e. Learn what this fault indicates and where to begin diagnosis.U0175Lost Communication With Restraints System Sensor FCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0175 concerns lost communication with restraints system sensor f. Learn what this fault indicates and where to begin diagnosis.U0176Lost Communication With Restraints System Sensor GCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0176 concerns lost communication with restraints system sensor g. Learn what this fault indicates and where to begin diagnosis.U0177Lost Communication With Restraints System Sensor HCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0177 concerns lost communication with restraints system sensor h. Learn what this fault indicates and where to begin diagnosis.U0178Lost Communication With Restraints System Sensor ICheck soonNetwork & Communication45–120 minutes for initial diagnosisU0178 concerns lost communication with restraints system sensor i. Learn what this fault indicates and where to begin diagnosis.U0179Lost Communication With Restraints System Sensor JCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0179 concerns lost communication with restraints system sensor j. Learn what this fault indicates and where to begin diagnosis.U017ALost Communication With Restraints System Sensor KCheck soonNetwork & Communication45–120 minutes for initial diagnosisU017A concerns lost communication with restraints system sensor k. Learn what this fault indicates and where to begin diagnosis.U017BLost Communication With Restraints System Sensor LCheck soonNetwork & Communication45–120 minutes for initial diagnosisU017B concerns lost communication with restraints system sensor l. Learn what this fault indicates and where to begin diagnosis.U017CLost Communication With Restraints System Sensor MCheck soonNetwork & Communication45–120 minutes for initial diagnosisU017C concerns lost communication with restraints system sensor m. Learn what this fault indicates and where to begin diagnosis.U017DLost Communication With Restraints System Sensor NCheck soonNetwork & Communication45–120 minutes for initial diagnosisU017D concerns lost communication with restraints system sensor n. Learn what this fault indicates and where to begin diagnosis.U017ELost Communication With Seat Belt Pretensioner Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU017E concerns lost communication with seat belt pretensioner module a. Learn what this fault indicates and where to begin diagnosis.U017FLost Communication With Seat Belt Pretensioner Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU017F concerns lost communication with seat belt pretensioner module b. Learn what this fault indicates and where to begin diagnosis.U0180Lost Communication With Automatic Lighting Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0180 concerns lost communication with automatic lighting control module. Learn what this fault indicates and where to begin diagnosis.U0181Lost Communication With Headlamp Leveling Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0181 concerns lost communication with headlamp leveling control module a. Learn what this fault indicates and where to begin diagnosis.U0182Lost Communication With Lighting Control Module - FrontCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0182 concerns lost communication with lighting control module - front. Learn what this fault indicates and where to begin diagnosis.