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.

Check soon P · Powertrain 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 313–336 of 6682

Most searched first

P01C8Fuel Rail/System Pressure - Too Low Bank 2Check soonFuel System30–120 minutes for initial diagnosisP01C8 relates to fuel rail/system pressure - too low bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P01C9Fuel Rail/System Pressure - Too High Bank 2Check soonFuel System30–120 minutes for initial diagnosisP01C9 relates to fuel rail/system pressure - too high bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P01CAFuel Rail Pressure Too Low - Engine Cranking Bank 2Check soonFuel System30–120 minutes for initial diagnosisP01CA relates to fuel rail pressure too low - engine cranking bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P01CBCylinder 1 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01CB relates to cylinder 1 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01CCCylinder 1 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01CC relates to cylinder 1 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01CDCylinder 2 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01CD relates to cylinder 2 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01CECylinder 2 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01CE relates to cylinder 2 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01CFCylinder 3 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01CF relates to cylinder 3 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D0Cylinder 3 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01D0 relates to cylinder 3 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D1Cylinder 4 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01D1 relates to cylinder 4 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D2Cylinder 4 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01D2 relates to cylinder 4 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D3Cylinder 5 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01D3 relates to cylinder 5 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D4Cylinder 5 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01D4 relates to cylinder 5 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D5Cylinder 6 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01D5 relates to cylinder 6 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D6Cylinder 6 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01D6 relates to cylinder 6 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D7Cylinder 7 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01D7 relates to cylinder 7 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D8Cylinder 7 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01D8 relates to cylinder 7 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01D9Cylinder 8 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01D9 relates to cylinder 8 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01DACylinder 8 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01DA relates to cylinder 8 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01DBCylinder 9 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01DB relates to cylinder 9 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01DCCylinder 9 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01DC relates to cylinder 9 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01DDCylinder 10 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01DD relates to cylinder 10 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.P01DECylinder 10 Injection Timing Performance - Over AdvancedCheck soonFuel System30–120 minutes for initial diagnosisP01DE relates to cylinder 10 injection timing performance - over advanced. Check the fault conditions and vehicle-specific procedure before replacing parts.P01DFCylinder 11 Injection Timing Performance - Over RetardedCheck soonFuel System30–120 minutes for initial diagnosisP01DF relates to cylinder 11 injection timing performance - over retarded. Check the fault conditions and vehicle-specific procedure before replacing parts.