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 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 4009–4032 of 8256

Most searched first

P2260AIR System Control B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2260 relates to air system control b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2261Turbocharger/Supercharger Bypass Valve A - MechanicalCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2261 relates to turbocharger/supercharger bypass valve a - mechanical. Check the fault conditions and vehicle-specific procedure before replacing parts.P2262Turbocharger/Supercharger Boost Pressure A Not Detected - MechanicalCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2262 relates to turbocharger/supercharger boost pressure a not detected - mechanical. Check the fault conditions and vehicle-specific procedure before replacing parts.P2263Turbocharger/Supercharger A Boost System PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2263 relates to turbocharger/supercharger a boost system performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2264Water in Fuel Sensor A CircuitCheck soonFuel System30–120 minutes for initial diagnosisP2264 relates to water in fuel sensor a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2265Water in Fuel Sensor A Circuit Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP2265 relates to water in fuel sensor a circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2266Water in Fuel Sensor A Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2266 relates to water in fuel sensor a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2267Water in Fuel Sensor A Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2267 relates to water in fuel sensor a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2268Water in Fuel Sensor A Circuit IntermittentCheck soonFuel System30–120 minutes for initial diagnosisP2268 relates to water in fuel sensor a circuit intermittent. Check the fault conditions and vehicle-specific procedure before replacing parts.P2269Water in Fuel Condition - Sensor ACheck soonFuel System30–120 minutes for initial diagnosisP2269 relates to water in fuel condition - sensor a. Check the fault conditions and vehicle-specific procedure before replacing parts.P226AWater in Fuel Lamp Control CircuitCheck soonFuel System30–120 minutes for initial diagnosisP226A relates to water in fuel lamp control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P226BTurbocharger/Supercharger A Boost Pressure Too High - MechanicalCheck soonSensors & Electronics30–120 minutes for initial diagnosisP226B relates to turbocharger/supercharger a boost pressure too high - mechanical. Check the fault conditions and vehicle-specific procedure before replacing parts.P226CTurbocharger Boost Control A Slow ResponseCheck soonSensors & Electronics30–120 minutes for initial diagnosisP226C relates to turbocharger boost control a slow response. Check the fault conditions and vehicle-specific procedure before replacing parts.P226DParticulate Filter Deteriorated/Missing Substrate Bank 1Check soonEmissions System30–120 minutes for initial diagnosisP226D relates to particulate filter deteriorated/missing substrate bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P226EParticulate Filter Deteriorated/Missing Substrate Bank 2Check soonEmissions System30–120 minutes for initial diagnosisP226E relates to particulate filter deteriorated/missing substrate bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P226FTurbocharger Boost Control B Slow ResponseCheck soonSensors & Electronics30–120 minutes for initial diagnosisP226F relates to turbocharger boost control b slow response. Check the fault conditions and vehicle-specific procedure before replacing parts.P2270O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2270 relates to o2 sensor signal biased/stuck lean bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2271O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2271 relates to o2 sensor signal biased/stuck rich bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2272O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2272 relates to o2 sensor signal biased/stuck lean bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2273O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2273 relates to o2 sensor signal biased/stuck rich bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2274O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2274 relates to o2 sensor signal biased/stuck lean bank 1 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P2275O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2275 relates to o2 sensor signal biased/stuck rich bank 1 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P2276O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2276 relates to o2 sensor signal biased/stuck lean bank 2 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P2277O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2277 relates to o2 sensor signal biased/stuck rich bank 2 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.