OBD2 Code Lookup

• P0010 Open or shorted circuit to the Bank 1 intake VVT solenoid.
• P0011 Intake camshaft timing is ahead of where the ECU expects it on Bank 1.
• P0012 Bank 1 intake cam is lagging the commanded position.
• P0014 Exhaust camshaft timing is over-advanced on Bank 1.
• P0015 Bank 1 exhaust camshaft is lagging behind where the ECU commanded.
• P0016 The crankshaft and intake camshaft on Bank 1 are out of sync.
• P0017 Exhaust camshaft and crankshaft positions are out of sync on Bank 1.
• P0018 Bank 2 intake cam and crank are out of sync.
• P0021 Bank 2 intake cam is timed ahead of commanded.
• P0101 The MAF sensor is reading airflow outside the expected range.
• P0102 MAF signal voltage is below the expected range.
• P0103 MAF signal voltage is above the expected range.
• P0107 MAP sensor signal is below the expected range.
• P0108 MAP sensor signal is above the expected range.
• P0113 The intake air temperature sensor is reading implausibly high.
• P0117 ECT sensor is reading impossibly cold.
• P0118 ECT sensor is reading impossibly hot or open.
• P0120 The throttle position sensor signal is out of range.
• P0121 TPS reading is inconsistent with other engine inputs.
• P0122 TPS signal voltage is stuck low.
• P0123 TPS signal voltage is stuck high.
• P0125 Engine takes too long to warm up enough for closed-loop fueling.
• P0128 The engine never warms up to its target temperature.
• P0131 Upstream O2 sensor on Bank 1 is reading a stuck-low (lean) voltage.
• P0132 Upstream O2 sensor on Bank 1 is reading stuck-high (rich).
• P0133 Upstream O2 sensor on Bank 1 is responding too slowly to fuel mix changes.
• P0135 The heater inside the upstream O2 sensor on Bank 1 is not working.
• P0137 Downstream O2 sensor on Bank 1 is stuck low.
• P0138 Downstream O2 sensor on Bank 1 is stuck high.
• P0140 Downstream O2 sensor never warms up enough to start switching.
• P0141 The heater in the downstream (post-catalyst) O2 sensor on Bank 1 is not working.
• P0151 Upstream O2 sensor on Bank 2 is stuck low (lean).
• P0153 Upstream O2 sensor on Bank 2 is responding too slowly.
• P0155 Upstream O2 sensor heater on Bank 2 is not working.
• P0161 Downstream O2 sensor heater on Bank 2 is not working.
• P0171 The engine is running with too much air relative to fuel on Bank 1.
• P0172 The engine is running with too much fuel relative to air on Bank 1.
• P0174 Bank 2 (the other side of a V-engine) is running too lean.
• P0175 Bank 2 fuel trim has gone significantly negative — too much fuel.
• P0201 The fuel injector circuit for cylinder 1 is open or shorted.
• P0299 Boost pressure is below what the ECM expects.
• P0300 The engine is misfiring on more than one cylinder or the ECM cannot pin it down.
• P0301 Cylinder #1 is misfiring.
• P0302 Cylinder #2 is misfiring.
• P0303 Cylinder #3 is misfiring.
• P0304 Cylinder #4 is misfiring.
• P0305 Cylinder #5 is misfiring (6+ cylinder engines only).
• P0306 Cylinder #6 is misfiring (V6 or inline-6 engines).
• P0307 Cylinder #7 is misfiring (V8+ engines).
• P0308 Cylinder #8 is misfiring (V8 engines).
• P0316 Misfire detected only during cold-start window.
• P0325 The knock sensor is not reporting usable data.
• P0335 The crankshaft position sensor is not reporting correctly.
• P0340 The camshaft position sensor signal is missing or out of range.
• P0341 Cam sensor signal is present but inconsistent with crank.
• P0401 Not enough exhaust gas is flowing through the EGR system.
• P0411 The secondary air injection system is not pushing the expected air volume.
• P0420 The catalytic converter on Bank 1 is not cleaning exhaust as efficiently as it should.
• P0421 The pre-cat (close-coupled) catalyst is under-performing.
• P0430 The catalytic converter on Bank 2 is under-performing.
• P0440 Generic EVAP system fault detected.
• P0441 The EVAP purge flow does not match what was commanded.
• P0442 A small leak has been detected in the EVAP system.
• P0443 Electrical fault in the EVAP purge solenoid circuit.
• P0446 The EVAP vent valve or its circuit is not working correctly.
• P0455 A large leak has been detected in the EVAP system.
• P0456 A very small leak has been detected in the EVAP system.
• P0457 EVAP leak that the ECM has identified as gas-cap-related.
• P0480 Electrical fault in the primary cooling fan circuit.
• P0500 The vehicle speed signal is missing or out of range.
• P0501 VSS reading is implausible.
• P0505 The ECM can't control idle speed correctly.
• P0506 Idle is below the commanded RPM.
• P0507 The engine is idling faster than the ECM commanded.
• P0521 Oil pressure sensor signal is implausible.
• P0524 The ECM has detected genuinely low engine oil pressure.
• P0562 Charging system voltage is below normal.
• P0563 Charging system voltage is above normal.
• P0600 Communication between control modules has failed.
• P0601 ECM has detected memory corruption in itself.
• P0603 ECM keep-alive memory has failed.
• P0606 The engine control module itself has reported an internal fault.
• P0627 Open or shorted circuit to the fuel pump driver.
• P0700 The transmission control module (TCM) has reported a fault.
• P0705 The transmission range sensor signal is invalid.
• P0715 Transmission input speed signal is missing.
• P0720 The transmission output speed sensor is not reporting correctly.
• P0740 Generic TCC circuit fault.
• P0741 The torque converter lockup clutch is not engaging when commanded.
• P0750 Generic shift solenoid A circuit fault.
• P0755 Generic shift solenoid B circuit fault.
• P2096 The downstream O2 sensor on Bank 1 is reading persistently lean.
• P2097 Downstream fuel trim on Bank 1 is biased rich.
• P2138 Two pedal-position signals do not agree.
• P2195 The upstream O2 sensor on Bank 1 is stuck at a lean voltage.
• P2270 Downstream O2 sensor on Bank 1 stuck at a lean voltage.
• U0001 Generic high-speed CAN bus fault.
• U0100 The rest of the car's modules have lost CAN bus contact with the engine ECM.
• U0101 The ECM cannot reach the transmission control module.
• U0121 The ECM cannot reach the ABS module over CAN.

How OBD2 codes are organized

• P-codes — Powertrain (engine, transmission). Most check engine light codes.
• B-codes — Body (airbags, climate, lighting, interior).
• C-codes — Chassis (ABS, traction control, steering, suspension).
• U-codes — Network / communication (CAN bus, module talk).

After the letter, the second character is 0 (generic SAE code) or 1 (manufacturer-specific). The next three characters identify the specific fault.