// All trouble codes
OBD2 Trouble Code Dictionary
When the check-engine light comes on, your car stores a trouble code. Below you'll find what the most common OBD2 codes mean, their symptoms and likely causes. AutoMulti reads these codes from your car and explains them in plain language with AI.
Ignition & Misfire
- P0300Random/Multiple Cylinder Misfire
- P0301Cylinder 1 Misfire
- P0302Cylinder 2 Misfire
- P0303Cylinder 3 Misfire
- P0304Cylinder 4 Misfire
- P0305Cylinder 5 Misfire
- P0306Cylinder 6 Misfire
- P0307Cylinder 7 Misfire
- P0308Cylinder 8 Misfire
- P0326Knock Sensor Range/Performance (Bank 1)
- P0351Ignition Coil A Primary/Secondary Circuit
- P0352Ignition Coil B Primary/Secondary Circuit
Fuel System
Sensors
- P0101Mass Air Flow (MAF) Range/Performance
- P0102Mass Air Flow (MAF) Sensor Low Input
- P0103Mass Air Flow (MAF) Sensor High Input
- P0106MAP/Barometric Pressure Sensor Range/Performance
- P0107MAP/Barometric Pressure Sensor Low Input
- P0108MAP/Barometric Pressure Sensor High Input
- P0112Intake Air Temperature (IAT) Sensor Low Input
- P0113Intake Air Temperature (IAT) Sensor High Input
- P0116Engine Coolant Temperature (ECT) Sensor Range/Performance
- P0117Engine Coolant Temperature (ECT) Sensor Low Input
- P0118Engine Coolant Temperature (ECT) Sensor High Input
- P0120Throttle/Pedal Position Sensor A Circuit
- P0121Throttle Position Sensor A Range/Performance
- P0122Throttle Position Sensor (TPS) Low Input
- P0123Throttle Position Sensor (TPS) High Input
- P0130Oxygen (O2) Sensor Circuit (Bank 1 Sensor 1)
- P0131Oxygen Sensor Low Voltage (Bank 1 Sensor 1)
- P0132Oxygen Sensor High Voltage (Bank 1 Sensor 1)
- P0133Oxygen Sensor Slow Response (Bank 1 Sensor 1)
- P0134Oxygen Sensor No Activity (Bank 1 Sensor 1)
- P0135Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)
- P0137Oxygen Sensor Low Voltage (Bank 1 Sensor 2)
- P0138Oxygen Sensor High Voltage (Bank 1 Sensor 2)
- P0140Oxygen Sensor No Activity (Bank 1 Sensor 2)
- P0141Oxygen Sensor Heater Circuit (Bank 1 Sensor 2)
- P0150Oxygen Sensor Circuit (Bank 2 Sensor 1)
- P0155Oxygen Sensor Heater Circuit (Bank 2 Sensor 1)
- P0325Knock Sensor Circuit (Bank 1)
- P0335Crankshaft Position Sensor Circuit
- P0340Camshaft Position Sensor Circuit
- P0463Fuel Level Sensor High Input
- P0500Vehicle Speed Sensor (VSS)
Emissions System
- P0401EGR Insufficient Flow
- P0402EGR Excessive Flow
- P0404EGR Range/Performance
- P0405EGR Sensor A Low Input
- P0411Secondary Air Injection System Incorrect Flow
- P0420Catalyst Efficiency Below Threshold (Bank 1)
- P0430Catalyst Efficiency Below Threshold (Bank 2)
- P0441EVAP Incorrect Purge Flow
- P0442EVAP System Small Leak
- P0443EVAP Purge Valve Circuit
- P0446EVAP Vent Control Circuit
- P0449EVAP Vent Valve Circuit
- P0455EVAP System Large Leak
- P0456EVAP System Very Small Leak
- P0457EVAP Leak (Loose Fuel Cap)
Engine & Mechanical
- P0010Camshaft Position Actuator (A) Circuit (Bank 1)
- P0011Camshaft Timing Over-Advanced (Bank 1)
- P0012Camshaft Timing Over-Retarded (Bank 1)
- P0013Exhaust Camshaft Actuator (B) Circuit (Bank 1)
- P0014Exhaust Camshaft Timing Over-Advanced (Bank 1)
- P0016Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A)
- P0017Crank-Cam Correlation (Bank 1 Sensor B)
- P0021Intake Camshaft Timing Over-Advanced (Bank 2)
- P0125Insufficient Coolant Temp for Closed Loop
- P0126Insufficient Coolant Temp for Stable Operation
- P0128Coolant Thermostat Temperature Below Regulating
- P0217Engine Over Temperature Condition
- P0505Idle Air Control System
- P0506Idle Speed Lower Than Expected
- P0507Idle Speed Higher Than Expected
Transmission
- P0700Transmission Control System Malfunction
- P0705Transmission Range Sensor (PRNDL) Circuit
- P0715Input/Turbine Speed Sensor Circuit
- P0720Output Shaft Speed Sensor Circuit
- P0730Incorrect Gear Ratio
- P0740Torque Converter Clutch (Lock-up) Circuit
- P0741Torque Converter Clutch Circuit (Stuck Off)
- P0750Shift Solenoid A
- P0755Shift Solenoid B
Electrical
- C0035Left Front Wheel Speed Sensor Circuit
- C0040Right Front Wheel Speed Sensor Circuit
- P0562System Voltage Low
- P0563System Voltage High
- P0606ECM/PCM Processor Fault
- P0620Generator (Alternator) Control Circuit
- P0627Fuel Pump Control Circuit
- U0100Lost Communication With ECM/PCM
- U0101Lost Communication With TCM
- U0121Lost Communication With ABS Module
- U0140Lost Communication With BCM