OBD-II Fault Codes
Look up a code from your scanner. Every code page shows the risk first, then what it means, possible causes and how it is diagnosed.
Codes and titles follow SAE J2012 · Maker notes verified per make and engine · How we verify
Browse by system
Powertrain codes by subsystem
P00xxFuel, air metering and auxiliary emission controlsP01xxFuel and air meteringP02xxFuel and air metering (injector circuit)P03xxIgnition system and misfireP04xxAuxiliary emission controlsP05xxVehicle speed, idle control and auxiliary inputsP06xxComputer and auxiliary outputsP07xxTransmissionP2xxxAdditional generic codes (fuel, air, emissions)
Most searched codes
P0420Catalyst System Efficiency Below Threshold (Bank 1)Normal riskP0300Random/Multiple Cylinder Misfire DetectedHigh riskP0171System Too Lean (Bank 1)Normal riskP0128Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)Normal riskP0455Evaporative Emission System Leak Detected (Large Leak)Normal riskP0401Exhaust Gas Recirculation "A" Flow Insufficient DetectedNormal riskP0442Evaporative Emission System Leak Detected (Small Leak)Normal riskP0700Transmission Control System (MIL Request)Normal riskP0299Turbocharger/Supercharger "A" Underboost ConditionNormal riskP0172System Too Rich (Bank 1)Normal riskP0135O2 Sensor Heater Circuit (Bank 1 Sensor 1)Normal riskP0113Intake Air Temperature Sensor 1 Circuit HighNormal risk
How to read a fault code
The letter is the system, the first digit says generic or maker-specific, the next digit the subsystem and the last two the exact fault. Fault Code Lookup →All fault codes
B0001Driver Frontal Stage 1 Deployment ControlHigh riskB0002Driver Frontal Stage 2 Deployment ControlHigh riskB0003Driver Frontal Stage 3 Deployment ControlHigh riskB0004Driver Knee Bolster Deployment ControlHigh riskB0010Passenger Frontal Stage 1 Deployment ControlHigh riskB0011Passenger Frontal Stage 2 Deployment ControlHigh riskB0012Passenger Frontal Stage 3 Deployment ControlHigh riskB0013Passenger Knee Bolster Deployment ControlHigh riskB0020Left Side Airbag Deployment ControlHigh riskB0021Left Curtain Airbag Deployment Control 1High riskB0022Left Curtain Airbag Deployment Control 2High riskB0028Right Side Airbag Deployment ControlHigh riskB0029Right Curtain Airbag Deployment Control 1High riskB002ARight Curtain Airbag Deployment Control 2High riskB0030Second Row Left Side Airbag Deployment ControlHigh riskB0038Second Row Right Side Airbag Deployment ControlHigh riskB0050Driver Seat Belt SensorHigh riskB0052Passenger Seat Belt SensorHigh riskB0070Driver Seat Belt Pretensioner "A" Deployment ControlHigh riskB0072Passenger Seat Belt Pretensioner "A" Deployment ControlHigh riskB0080Driver Seat Belt Load Limiter Deployment ControlHigh riskB0082Passenger Seat Belt Load Limiter Deployment ControlHigh riskB0090Left Frontal Restraints SensorHigh riskB0091Left Side Restraints Sensor 1High riskB0095Right Frontal Restraints SensorHigh riskB0096Right Side Restraints Sensor 1High riskB0099Rollover SensorHigh riskB00A0Occupant Classification SystemHigh riskB00C0Passenger Occupant Classification Sensor "A"High riskB00DFPassenger Restraints Disable SwitchHigh riskC0020ABS Pump Motor ControlHigh riskC0021Brake Booster PerformanceHigh riskC0031Left Front Wheel Speed SensorHigh riskC0034Right Front Wheel Speed SensorHigh riskC0035Left Front Wheel Speed Sensor Circuit (GM)High riskC0037Left Rear Wheel Speed SensorHigh riskC003ARight Rear Wheel Speed SensorHigh riskC0040Right Front Wheel Speed Sensor Circuit (GM)High riskC0042Brake Pedal Position Sensor Circuit "A"High riskC0044Brake Pressure Sensor "A"High riskC0045Left Rear Wheel Speed Sensor Circuit (GM)High riskC0049Brake Fluid LevelHigh riskC004ABrake Lining Wear SensorHigh riskC0050Right Rear Wheel Speed Sensor Circuit (GM)High riskC0051Steering Wheel Position SensorHigh riskC0061Lateral Acceleration SensorHigh riskC0062Longitudinal Acceleration SensorHigh riskC0063Yaw Rate SensorHigh riskC0072Brake Temperature Too HighHigh riskC0077Low Tire PressureNormal riskC0110Pump Motor Circuit (GM)High riskC0121Valve Relay Circuit (GM)High riskC0500Left Front Wheel Speed Sensor "A" Circuit/OpenHigh riskC0506Right Front Wheel Speed Sensor "A" Circuit/OpenHigh riskC050CLeft Rear Wheel Speed Sensor "A" Circuit/OpenHigh riskC0512Right Rear Wheel Speed Sensor "A" Circuit/OpenHigh riskC0526Steering Angle Sensor ModuleHigh riskP0010"A" Camshaft Position Actuator Circuit/Open (Bank 1)High riskP0011"A" Camshaft Position – Timing Over-Advanced Or System Performance (Bank 1)High riskP0012"A" Camshaft Position – Timing Over-Retarded (Bank 1)High riskP0013"B" Camshaft Position Actuator Circuit/Open (Bank 1)High riskP0014"B" Camshaft Position – Timing Over-Advanced Or System Performance (Bank 1)High riskP0015"B" Camshaft Position – Timing Over-Retarded (Bank 1)High riskP0016Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A)High riskP0017Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor B)High riskP0018Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor A)High riskP0019Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor B)High riskP0020"A" Camshaft Position Actuator Circuit/Open (Bank 2)High riskP0021"A" Camshaft Position – Timing Over-Advanced Or System Performance (Bank 2)High riskP0022"A" Camshaft Position – Timing Over-Retarded (Bank 2)High riskP0023"B" Camshaft Position Actuator Circuit (Bank 2)High riskP0024"B" Camshaft Position – Timing Over-Advanced Or System Performance (Bank 2)High riskP0025"B" Camshaft Position – Timing Over-Retarded (Bank 2)High riskP0026Intake Valve Control Solenoid Circuit Range/Performance (Bank 1)High riskP0027Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 1)High riskP0028Intake Valve Control Solenoid Circuit Range/Performance (Bank 2)High riskP0029Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)High riskP0030HO2S Heater Control Circuit (Bank 1 Sensor 1)Normal riskP0031HO2S Heater Control Circuit Low (Bank 1 Sensor 1)Normal riskP0032HO2S Heater Control Circuit High (Bank 1 Sensor 1)Normal riskP0036HO2S Heater Control Circuit (Bank 1 Sensor 2)Normal riskP0037HO2S Heater Control Circuit Low (Bank 1 Sensor 2)Normal riskP0038HO2S Heater Control Circuit High (Bank 1 Sensor 2)Normal riskP0043HO2S Heater Control Circuit Low (Bank 1 Sensor 3)Normal riskP0044HO2S Heater Control Circuit High (Bank 1 Sensor 3)Normal riskP0050HO2S Heater Control Circuit (Bank 2 Sensor 1)Normal riskP0051HO2S Heater Control Circuit Low (Bank 2 Sensor 1)Normal riskP0052HO2S Heater Control Circuit High (Bank 2 Sensor 1)Normal riskP0053HO2S Heater Resistance (Bank 1 Sensor 1)Normal riskP0054HO2S Heater Resistance (Bank 1 Sensor 2)Normal riskP0056HO2S Heater Control Circuit (Bank 2 Sensor 2)Normal riskP0057HO2S Heater Control Circuit Low (Bank 2 Sensor 2)Normal riskP0058HO2S Heater Control Circuit High (Bank 2 Sensor 2)Normal riskP0059HO2S Heater Resistance (Bank 2 Sensor 1)Normal riskP0060HO2S Heater Resistance (Bank 2 Sensor 2)Normal riskP0063HO2S Heater Control Circuit Low (Bank 2 Sensor 3)Normal riskP0064HO2S Heater Control Circuit High (Bank 2 Sensor 3)Normal riskP0068MAP/MAF – Throttle Position CorrelationNormal riskP0069Manifold Absolute Pressure – Barometric Pressure CorrelationNormal riskP0087Fuel Rail/System Pressure – Too LowHigh risk