Skip to content
EN · km
Language
Units
My Garage
Fault codes

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 controlsBBodyBody and restraintsCChassisChassis and brakesUNetworkNetwork communication

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)Emission controlsNormal riskP0300Random/Multiple Cylinder Misfire DetectedIgnition and misfireHigh riskP0171System Too Lean (Bank 1)Fuel and air meteringNormal riskP0128Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)Fuel and air meteringNormal riskP0455Evaporative Emission System Leak Detected (Large Leak)Emission controlsNormal riskP0401Exhaust Gas Recirculation "A" Flow Insufficient DetectedEmission controlsNormal riskP0442Evaporative Emission System Leak Detected (Small Leak)Emission controlsNormal riskP0700Transmission Control System (MIL Request)TransmissionNormal riskP0299Turbocharger/Supercharger "A" Underboost ConditionInjector circuitsNormal riskP0172System Too Rich (Bank 1)Fuel and air meteringNormal riskP0135O2 Sensor Heater Circuit (Bank 1 Sensor 1)Fuel and air meteringNormal riskP0113Intake 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

P0600Serial Communication LinkControl modules and outputsHigh riskP0601Internal Control Module Memory Check Sum ErrorControl modules and outputsHigh riskP0602Control Module Programming ErrorControl modules and outputsHigh riskP0603Internal Control Module Keep Alive Memory (KAM) ErrorControl modules and outputsHigh riskP0604Internal Control Module Random Access Memory (RAM) ErrorControl modules and outputsHigh riskP0605Internal Control Module Read Only Memory (ROM) ErrorControl modules and outputsHigh riskP0606Control Module ProcessorControl modules and outputsHigh riskP0607Control Module PerformanceControl modules and outputsHigh riskP0610Control Module Vehicle Options ErrorControl modules and outputsHigh riskP0620Generator Control CircuitControl modules and outputsHigh riskP0622Generator Field "F" Control CircuitControl modules and outputsHigh riskP0627Fuel Pump "A" Control Circuit/OpenControl modules and outputsHigh riskP0628Fuel Pump "A" Control Circuit LowControl modules and outputsHigh riskP0629Fuel Pump "A" Control Circuit HighControl modules and outputsHigh riskP0633Immobilizer Key Not Programmed – ECM/PCMControl modules and outputsNormal riskP0670Glow Plug Control Module Control CircuitControl modules and outputsNormal riskP0671Cylinder 1 Glow Plug CircuitControl modules and outputsNormal riskP0672Cylinder 2 Glow Plug CircuitControl modules and outputsNormal riskP0673Cylinder 3 Glow Plug CircuitControl modules and outputsNormal riskP0674Cylinder 4 Glow Plug CircuitControl modules and outputsNormal riskP0675Cylinder 5 Glow Plug CircuitControl modules and outputsNormal riskP0676Cylinder 6 Glow Plug CircuitControl modules and outputsNormal riskP0685ECM/PCM Power Relay Control Circuit/OpenControl modules and outputsHigh riskP0686ECM/PCM Power Relay Control Circuit LowControl modules and outputsHigh riskP0687ECM/PCM Power Relay Control Circuit HighControl modules and outputsHigh riskP0688ECM/PCM Power Relay Sense Circuit/OpenControl modules and outputsHigh risk