Check engine light codes

Common check engine light codes are listed for you here. This is not a complete or exhaustive list of every code that could be set in your computer's memory.

Instead, what I did was I went through the entire OBD II code list and picked out codes that I have seen set in the real auto repair world. I also included a short description of what that check engine light means.

The P0400 codes relate to the evap emissions system (Gas Cap Codes) that is also quite common to experience intermittent failure (see the auto repair video below).

But depending on your year, make and model vehicle you may see many other diagnostic trouble codes set.

Check engine light diagnosis

On my check engine light diagnosis page I provide basic tips that will help with where to start diagnosis and repair of the most common codes.

If your specific car problems are not addressed by any these articles your best bet would be to follow a diagnostic tree chart for your particular service engine soon light failure.

I diagnose OBD II check engine light codes almost every day and still find it necessary to refer to a professional auto repair diagram to efficiently solve the problem.

Below the list is a link to the car repair manual. That is not only what I use, but also I find to be the most effective tool in your fight against the engine lamp.

Give this auto repair and check engine light codes resource page a

Gas cap codes explained

OBD II check engine light codes definitions

• P0016 Crankshaft/Camshaft Timing Misalignment Reported
• P0037 Heated O2S (Bank 1 Sensor 2) Heater Relay Circuit Low Input
• P0038 Heated O2S (Bank 1 Sensor 2) Heater Relay Circuit High Input
• P0051 Heated O2S (Bank 2 Sensor 1) Heater Relay Circuit Low Input
• P0052 Heated O2S (Bank 2 Sensor 1) Heater Relay Circuit High Input
• P0056 HO2S (Bank 2 Sensor 1) Heater Relay Circuit Malfunction
• P0057 HO2S (Bank 2 Sensor 1) Heater Relay Circuit Low Input
• P0058 HO2S (Bank 2 Sensor 1) Heater Relay Circuit High Input
• P0070 Battery Temperature Sensor Circuit Stuck
• P0072 Battery Temperature Sensor Circuit Low Input
• P0073 Battery Temperature Sensor Circuit High Input
• P0107 Manifold Absolute Pressure Sensor Low Input
• P0108 M.A.P. Sensor High Input
• P0111 Intake Air Temperature Sensor Range/Performance
• P0112 Intake Air Temperature Circuit Low Input
• P0113 Intake Air Temperature Sensor Circuit High Input
• P0117 Engine Coolant Temperature Sensor Circuit Low Input
• P0118 Engine Coolant Temperature Sensor Circuit High Input
• P0121 Throttle Position Sensor Does Not Agree With MAP
• P0122 T.P.S. Circuit Low Input
• P0123 T.P.S. Circuit High Input
• P0125 Closed Loop Operation Temperature Not Reached
• P0129 Barometric Pressure Sensor Out-Of-Range Low
• P0131 HO2S (Bank 1 Sensor 1) Signal Low Input
• P0132 HO2S (Bank 1 Sensor 1) Signal Shorted to Voltage
• P0133 HO2S (Bank 1 Sensor 1) Slow Response
• P0135 HO2S (Bank 1 Sensor 1) Heater Circuit Malfunction
• P0136 HO2S (Bank 1 Sensor 2) Heater Relay Circuit Low Input
• P0137 HO2S (Bank 1 Sensor 2) Signal Low Input
• P0138 HO2S (Bank 1 Sensor 2) Signal Shorted to Voltage
• P0141 HO2S (Bank 1 Sensor 2) Heater Circuit Malfunction
• P0165 Starter Relay Circuit Malfunction
• P0171 Fuel System Lean (Bank 1)
• P0172 Fuel System Rich (Bank 1)
• P0174 Fuel System Lean (Bank 2)
• P0175 Fuel System Rich (Bank 2)
• P0201 Fuel Injector 1 Control Circuit Malfunction
• P0202 Fuel Injector 2 Control Circuit Malfunction
• P0203 Fuel Injector 3 Control Circuit Malfunction
• P0204 Fuel Injector 4 Control Circuit Malfunction
• P0205 Fuel Injector 5 Control Circuit Malfunction
• P0206 Fuel Injector 6 Control Circuit Malfunction
• P0207 Fuel Injector 7 Control Circuit Malfunction
• P0208 Fuel Injector 8 Control Circuit Malfunction
• P0300 Multiple Cylinder Misfire Detected
• P0301 Cylinder 1 Misfire Detected
• P0302 Cylinder 2 Misfire Detected
• P0303 Cylinder 3 Misfire Detected
• P0304 Cylinder 4 Misfire Detected
• P0305 Cylinder 5 Misfire Detected
• P0306 Cylinder 6 Misfire Detected
• P0307 Cylinder 7 Misfire Detected
• P0308 Cylinder 8 Misfire Detected
• P0315 Crankshaft Position Sensor Not Learned
• P0320 No Crank Reference Signal to PCM
• P0339 Crankshaft Position Sensor Circuit Malfunction
• P0340 No Camshaft Signals At PCM
• P0344 Camshaft Position Sensor Circuit Intermittent
• P0351 Ignition Coil 1 Primary Circuit Malfunction
• P0420 Catalyst Efficiency Below Normal (Bank 1)
• P0432 Catalyst Efficiency Below Normal (Bank 2)
• P0441 EVAP Purge Flow Monitor Fault
• P0442 EVAP System Small Leak Detected
• P0443 EVAP Purge Solenoid Circuit Malfunction
• P0455 EVAP System Large Leak Detected
• P0456 EVAP Leak Monitor Leak Medium Detected
• P0460 Fuel Level Sensor Unit No Change Over Miles
• P0461 Fuel Level Sensing Unit No Change Over Miles
• P0462 Fuel Level Sensor Unit Volts Too Low
• P0463 Fuel Level Sensor Unit Volts Too High
• P0500 Vehicle Speed Sensor Signal Circuit Malfunction
• P0505 Idle Air Control Motor Circuit Malfunction
• P0522 Engine Oil Pressure Sensor Circuit Low Input
• P0523 Engine Oil Pressure Sensor Circuit High Input
• P0600 PCM Internal Failure or No SPI Communications
• P0601 PCM Random Access Memory Failure or Self-Test Failed
• P0700 Automatic Transmission System Malfunction Detected
• P0705 A/T Check Shifter Signal Circuit Malfunction
• P0711 A/T Transmission Fluid Temperature Sensor Signal-No increase
• P0712 A/T Transmission Fluid Temperature Sensor Low Input
• P0713 A/T Transmission Fluid Temperature Sensor High Input
• P0720 Auto Trans Output Speed Sensor - Low Output Above 15 MPH
• P0740 A/T Torque Converter Clutch - No RPM Drop at Lockup
• P0743 A/T Transmission Relay Circuit Malfunction
• P0748 A/T Governor Pressure Solenoid/Transmission Relay Fault
• P0751 A/T Overdrive Switch Pressed Low For Over 5 Minutes
• P0753 A/T 3-4 Solenoid/Transmission Relay Circuit Malfunction
• P1195 HO2S-11 (Bank 1 Sensor 1) Signal Insufficient Activity
• P1196 HO2S-21 (Bank 2 Sensor 1) Signal Insufficient Activity
• P1281 Engine Is Cold Too Long
• P1282 Fuel Pump Relay Control Circuit Malfunction
• P1294 Target Idle Speed Not Reached
• P1296 5-Volt VREF Supply Not Present
• P1297 No Change In MAP Signal From Start To Running Transition
• P1299 Vacuum Leak Present With IAC Valve Fully Seated
• P1388 ASD Relay Control Circuit Malfunction
• P1389 No ASD Relay Voltage At PCM
• P1391 Crank or Cam Sensor Signal Malfunction (Intermittent)
• P1398 Misfire Adaptive Numerator At Limit
• P1486 EVAP Leak Detection Monitor Pinched Hose Detected
• P1491 Radiator Fan Control Relay Circuit Malfunction
• P1494 EVAP Leak Detection Pump Switch Or Mechanical Fault
• P1495 No CCD Messages Received From The BCM
• P1740 Auto Trans TCC or Overdrive Solenoid PSI In Gear At 0 MPH
• P1756 A/T Governor Pressure Not Equal To Target At 15-20 PSI
• P1757 A/T Governor Pressure Above 3 PSI In Gear At 0 MPH
• P1762 A/T Governor Pressure Sensor Offset Volts Too High/Low
• P1763 A/T Governor Pressure Sensor Signal Too High
• P1764 A/T Governor Pressure Sensor Signal Too Low
• P1765 A/T Switched Battery Malfunction
• P1899 Auto Trans Park Neutral Switch Stuck in Park Position or In Gear

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