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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

PPowertrainEngine, transmission and emission controls BBodyBody and restraints CChassisChassis and brakes UNetworkNetwork communication

Powertrain codes by subsystem

P00xxFuel, air metering and auxiliary emission controls P01xxFuel and air metering P02xxFuel and air metering (injector circuit)P03xxIgnition system and misfire P04xxAuxiliary emission controls P05xxVehicle speed, idle control and auxiliary inputs P06xxComputer and auxiliary outputs P07xxTransmission P2xxxAdditional generic codes (fuel, air, emissions)

Most searched codes

P0420Catalyst System Efficiency Below Threshold (Bank 1)Emission controlsNormal risk P0300Random/Multiple Cylinder Misfire DetectedIgnition and misfireHigh risk P0171System Too Lean (Bank 1)Fuel and air meteringNormal risk P0128Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)Fuel and air meteringNormal risk P0455Evaporative Emission System Leak Detected (Large Leak)Emission controlsNormal risk P0401Exhaust Gas Recirculation "A" Flow Insufficient DetectedEmission controlsNormal risk P0442Evaporative Emission System Leak Detected (Small Leak)Emission controlsNormal risk P0700Transmission Control System (MIL Request)TransmissionNormal risk P0299Turbocharger/Supercharger "A" Underboost ConditionInjector circuitsNormal risk P0172System Too Rich (Bank 1)Fuel and air meteringNormal risk P0135O2 Sensor Heater Circuit (Bank 1 Sensor 1)Fuel and air meteringNormal risk P0113Intake Air Temperature Sensor 1 Circuit HighFuel and air meteringNormal 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

P0422Main Catalyst Efficiency Below Threshold (Bank 1)Emission controlsNormal risk P0430Catalyst System Efficiency Below Threshold (Bank 2)Emission controlsNormal risk P0431Warm Up Catalyst Efficiency Below Threshold (Bank 2)Emission controlsNormal risk P0432Main Catalyst Efficiency Below Threshold (Bank 2)Emission controlsNormal risk P0440Evaporative Emission SystemEmission controlsNormal risk P0441Evaporative Emission System Incorrect Purge FlowEmission controlsNormal risk P0442Evaporative Emission System Leak Detected (Small Leak)Emission controlsNormal risk P0443Evaporative Emission System Purge Control Valve "A" CircuitEmission controlsNormal risk P0444Evaporative Emission System Purge Control Valve Circuit OpenEmission controlsNormal risk P0445Evaporative Emission System Purge Control Valve Circuit ShortedEmission controlsNormal risk P0446Evaporative Emission System Vent Control CircuitEmission controlsNormal risk P0447Evaporative Emission System Vent Control Circuit OpenEmission controlsNormal risk P0448Evaporative Emission System Vent Control Circuit ShortedEmission controlsNormal risk P0449Evaporative Emission System Vent Valve/Solenoid CircuitEmission controlsNormal risk P0450Evaporative Emission System Pressure Sensor/Switch "A" CircuitEmission controlsNormal risk P0451Evaporative Emission System Pressure Sensor/Switch "A" Circuit Range/PerformanceEmission controlsNormal risk P0452Evaporative Emission System Pressure Sensor/Switch "A" Circuit LowEmission controlsNormal risk P0453Evaporative Emission System Pressure Sensor/Switch "A" Circuit HighEmission controlsNormal risk P0454Evaporative Emission System Pressure Sensor/Switch "A" Circuit IntermittentEmission controlsNormal risk P0455Evaporative Emission System Leak Detected (Large Leak)Emission controlsNormal risk P0456Evaporative Emission System Leak Detected (Very Small Leak)Emission controlsNormal risk P0457Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)Emission controlsNormal risk P0458Evaporative Emission System Purge Control Valve Circuit LowEmission controlsNormal risk P0459Evaporative Emission System Purge Control Valve Circuit HighEmission controlsNormal risk P0460Fuel Level Sensor "A" CircuitEmission controlsNormal risk P0461Fuel Level Sensor "A" Circuit Range/PerformanceEmission controlsNormal risk P0462Fuel Level Sensor "A" Circuit LowEmission controlsNormal risk P0463Fuel Level Sensor "A" Circuit HighEmission controlsNormal risk P0464Fuel Level Sensor "A" Circuit IntermittentEmission controlsNormal risk P0496Evaporative Emission System High Purge FlowEmission controlsNormal risk P0497Evaporative Emission System Low Purge FlowEmission controlsNormal risk P0498Evaporative Emission System Vent Valve Control Circuit LowEmission controlsNormal risk P0499Evaporative Emission System Vent Valve Control Circuit HighEmission controlsNormal risk P0500Vehicle Speed Sensor "A"Speed, idle and inputsNormal risk P0501Vehicle Speed Sensor "A" Range/PerformanceSpeed, idle and inputsNormal risk P0502Vehicle Speed Sensor "A" Circuit Low InputSpeed, idle and inputsNormal risk P0503Vehicle Speed Sensor "A" Intermittent/Erratic/HighSpeed, idle and inputsNormal risk P0505Idle Control SystemSpeed, idle and inputsNormal risk P0506Idle Air Control System RPM Lower Than ExpectedSpeed, idle and inputsNormal risk P0507Idle Control System RPM Higher Than ExpectedSpeed, idle and inputsNormal risk P0508Idle Air Control System Circuit LowSpeed, idle and inputsNormal risk P0509Idle Air Control System Circuit HighSpeed, idle and inputsNormal risk P0513Invalid Immobilizer KeySpeed, idle and inputsNormal risk P0520Engine Oil Pressure Sensor/Switch "A" CircuitSpeed, idle and inputsHigh risk P0521Engine Oil Pressure Sensor/Switch "A" Range/PerformanceSpeed, idle and inputsHigh risk P0522Engine Oil Pressure Sensor/Switch "A" Circuit LowSpeed, idle and inputsHigh risk P0523Engine Oil Pressure Sensor/Switch "A" Circuit HighSpeed, idle and inputsHigh risk P0524Engine Oil Pressure Too LowSpeed, idle and inputsHigh risk P0560System VoltageSpeed, idle and inputsHigh risk P0561System Voltage UnstableSpeed, idle and inputsHigh risk P0562System Voltage LowSpeed, idle and inputsHigh risk P0563System Voltage HighSpeed, idle and inputsHigh risk P0600Serial Communication LinkControl modules and outputsHigh risk P0601Internal Control Module Memory Check Sum ErrorControl modules and outputsHigh risk P0602Control Module Programming ErrorControl modules and outputsHigh risk P0603Internal Control Module Keep Alive Memory (KAM) ErrorControl modules and outputsHigh risk P0604Internal Control Module Random Access Memory (RAM) ErrorControl modules and outputsHigh risk P0605Internal Control Module Read Only Memory (ROM) ErrorControl modules and outputsHigh risk P0606Control Module ProcessorControl modules and outputsHigh risk P0607Control Module PerformanceControl modules and outputsHigh risk P0610Control Module Vehicle Options ErrorControl modules and outputsHigh risk P0620Generator Control CircuitControl modules and outputsHigh risk P0622Generator Field "F" Control CircuitControl modules and outputsHigh risk P0627Fuel Pump "A" Control Circuit/OpenControl modules and outputsHigh risk P0628Fuel Pump "A" Control Circuit LowControl modules and outputsHigh risk P0629Fuel Pump "A" Control Circuit HighControl modules and outputsHigh risk P0633Immobilizer Key Not Programmed – ECM/PCMControl modules and outputsNormal risk P0670Glow Plug Control Module Control CircuitControl modules and outputsNormal risk P0671Cylinder 1 Glow Plug CircuitControl modules and outputsNormal risk P0672Cylinder 2 Glow Plug CircuitControl modules and outputsNormal risk P0673Cylinder 3 Glow Plug CircuitControl modules and outputsNormal risk P0674Cylinder 4 Glow Plug CircuitControl modules and outputsNormal risk P0675Cylinder 5 Glow Plug CircuitControl modules and outputsNormal risk P0676Cylinder 6 Glow Plug CircuitControl modules and outputsNormal risk P0685ECM/PCM Power Relay Control Circuit/OpenControl modules and outputsHigh risk P0686ECM/PCM Power Relay Control Circuit LowControl modules and outputsHigh risk P0687ECM/PCM Power Relay Control Circuit HighControl modules and outputsHigh risk P0688ECM/PCM Power Relay Sense Circuit/OpenControl modules and outputsHigh risk P0700Transmission Control System (MIL Request)TransmissionNormal risk P0710Transmission Fluid Temperature Sensor "A" CircuitTransmissionNormal risk P0711Transmission Fluid Temperature Sensor "A" Circuit Range/PerformanceTransmissionNormal risk P0712Transmission Fluid Temperature Sensor "A" Circuit LowTransmissionNormal risk P0713Transmission Fluid Temperature Sensor "A" Circuit HighTransmissionNormal risk P0714Transmission Fluid Temperature Sensor "A" Circuit IntermittentTransmissionNormal risk P0715Input/Turbine Speed Sensor "A" CircuitTransmissionHigh risk P0716Input/Turbine Speed Sensor "A" Circuit Range/PerformanceTransmissionHigh risk P0717Input/Turbine Speed Sensor "A" Circuit No SignalTransmissionHigh risk P0718Input/Turbine Speed Sensor "A" Circuit IntermittentTransmissionHigh risk P0720Output Speed Sensor CircuitTransmissionNormal risk P0721Output Speed Sensor Circuit Range/PerformanceTransmissionNormal risk P0722Output Speed Sensor Circuit No SignalTransmissionNormal risk P0723Output Speed Sensor Circuit IntermittentTransmissionNormal risk P0730Incorrect Gear RatioTransmissionHigh risk P0731Gear 1 Incorrect RatioTransmissionHigh risk P0732Gear 2 Incorrect RatioTransmissionHigh risk P0733Gear 3 Incorrect RatioTransmissionHigh risk P0734Gear 4 Incorrect RatioTransmissionHigh risk P0735Gear 5 Incorrect RatioTransmissionHigh risk P0736Reverse Incorrect RatioTransmissionHigh risk P0740Torque Converter Clutch Solenoid Circuit/OpenTransmissionNormal risk