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.

Fuel System Check soon 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 961–975 of 975

Most searched first

P0203Injector Circuit/Open Cylinder 3Check soonFuel System45–120 minutes for initial diagnosisP0203 means Injector Circuit/Open Cylinder 3. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0204Injector Circuit/Open Cylinder 4Check soonFuel System45–120 minutes for initial diagnosisP0204 means Injector Circuit/Open Cylinder 4. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0205Injector Circuit/Open Cylinder 5Check soonFuel System45–120 minutes for initial diagnosisP0205 means Injector Circuit/Open Cylinder 5. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0206Injector Circuit/Open Cylinder 6Check soonFuel System45–120 minutes for initial diagnosisP0206 means Injector Circuit/Open Cylinder 6. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0208Injector Circuit/Open Cylinder 8Check soonFuel System45–120 minutes for initial diagnosisP0208 means Injector Circuit/Open Cylinder 8. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0209Injector Circuit/Open Cylinder 9Check soonFuel System45–120 minutes for initial diagnosisP0209 means Injector Circuit/Open Cylinder 9. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0210Injector Circuit/Open Cylinder 10Check soonFuel System45–120 minutes for initial diagnosisP0210 means Injector Circuit/Open Cylinder 10. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0211Injector Circuit/Open Cylinder 11Check soonFuel System45–120 minutes for initial diagnosisP0211 means Injector Circuit/Open Cylinder 11. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0212Injector Circuit/Open Cylinder 12Check soonFuel System45–120 minutes for initial diagnosisP0212 means Injector Circuit/Open Cylinder 12. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0213Cold Start Injector 1 MalfunctionCheck soonFuel System45–120 minutes for initial diagnosisP0213 means Cold Start Injector 1 Malfunction. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0214Cold Start Injector 2 MalfunctionCheck soonFuel System45–120 minutes for initial diagnosisP0214 means Cold Start Injector 2 Malfunction. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0216Injection Timing Control Circuit MalfunctionCheck soonFuel System45–120 minutes for initial diagnosisP0216 means Injection Timing Control Circuit Malfunction. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0231Fuel Pump Secondary Circuit LowCheck soonFuel System45–120 minutes for initial diagnosisP0231 means Fuel Pump Secondary Circuit Low. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0232Fuel Pump Secondary Circuit HighCheck soonFuel System45–120 minutes for initial diagnosisP0232 means Fuel Pump Secondary Circuit High. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0233Fuel Pump Secondary Circuit IntermittentCheck soonFuel System45–120 minutes for initial diagnosisP0233 means Fuel Pump Secondary Circuit Intermittent. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.