OBD2 Fault Code Library

Free lookup for thousands of OBD2 trouble codes: filter by family, read short meanings, and open deeper articles. Desktop ELM327 scanner with live data and AI guidance.

OBD2 symptoms

Look up diagnostic trouble codes by what the car is doing: misfire, overheating, rough idle, a check engine light, and other common symptoms.

• Engine misfire
• Engine overheating
• Rough idle
• Check engine light
• Poor fuel economy
• Hard starting
• Engine stalling
• Catalytic converter efficiency
• Oxygen sensor fault
• EVAP leak
• Thermostat not reaching temperature
• Lean air-fuel mixture
• Rich air-fuel mixture
• EGR flow fault
• Engine knock
• Charging system
• Throttle position
• Mass airflow sensor
• Turbo underboost
• Coolant temperature sensor
• Transmission fault

• P033E — OBD2 code P033E flags a problem with the knock (detonation) detection (knock sensor 4 circuit intermittent (bank 2)). Short, gentle driving to a shop is usually possible. Common culprits: engine carbon buildup causing real detonation, damaged knock sensor wiring or connector, failed knock sensor.
• P0340 — P0340 — Camshaft Position Sensor Circuit Malfunction (Bank 1). A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: worn timing chain/belt or jumped timing, damaged sensor wiring or reluctor ring, low or dirty engine oil affecting VVT.
• P0341 — P0341 — Camshaft Position Sensor Circuit Range/Performance (Bank 1). A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: worn cam phaser, low or dirty engine oil affecting VVT, faulty camshaft position sensor.
• P0342 — OBD2 code P0342 flags a problem with the camshaft position and variable valve timing (camshaft position sensor a circuit low input (bank 1)). Short, gentle driving to a shop is usually possible. Common culprits: worn cam phaser, faulty camshaft position sensor, damaged sensor wiring or reluctor ring.
• P0343 — OBD2 code P0343 flags a problem with the camshaft position and variable valve timing (camshaft position sensor a circuit high input (bank 1)). Short, gentle driving to a shop is usually possible. Common culprits: faulty camshaft position sensor, worn timing chain/belt or jumped timing, low or dirty engine oil affecting VVT.
• P0344 — OBD2 code P0344 flags a problem with the camshaft position and variable valve timing (camshaft position sensor a circuit intermittent (bank 1)). Short, gentle driving to a shop is usually possible. Common culprits: low or dirty engine oil affecting VVT, worn timing chain/belt or jumped timing, damaged sensor wiring or reluctor ring.
• P0345 — OBD2 code P0345 flags a problem with the camshaft position and variable valve timing (camshaft position sensor a circuit malfunction (bank 2)). Short, gentle driving to a shop is usually possible. Common culprits: faulty camshaft position sensor, worn cam phaser, worn timing chain/belt or jumped timing.
• P0346 — P0346 — Camshaft Position Sensor A Circuit Range/Performance (Bank 2). A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: worn timing chain/belt or jumped timing, stuck or clogged VVT oil control valve (OCV), faulty camshaft position sensor.
• P0347 — OBD2 code P0347 flags a problem with the camshaft position and variable valve timing (camshaft position sensor a circuit low input (bank 2)). Short, gentle driving to a shop is usually possible. Common culprits: worn timing chain/belt or jumped timing, damaged sensor wiring or reluctor ring, faulty camshaft position sensor.
• P0348 — P0348 — Camshaft Position Sensor A Circuit High Input (Bank 2). A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: low or dirty engine oil affecting VVT, damaged sensor wiring or reluctor ring, worn timing chain/belt or jumped timing.
• P0349 — OBD2 code P0349 flags a problem with the camshaft position and variable valve timing (camshaft position sensor a circuit intermittent (bank 2)). Short, gentle driving to a shop is usually possible. Common culprits: damaged sensor wiring or reluctor ring, stuck or clogged VVT oil control valve (OCV), worn cam phaser.
• P0350 — P0350 — Ignition Coil Primary/Secondary Circuit Malfunction. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: failed ignition coil or coil pack, damaged coil wiring or connector, moisture or oil in the spark plug wells.
• P0351 — P0351 — Ignition Coil A Primary/Secondary Circuit Malfunction. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: damaged coil wiring or connector, moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM.
• P0352 — Ignition Coil B Primary/Secondary Circuit Malfunction (P0352): a powertrain (engine/transmission) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by worn spark plugs or wrong plug gap, moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM.
• P0353 — OBD2 code P0353 flags a problem with the ignition system (ignition coil c primary/secondary circuit malfunction). Short, gentle driving to a shop is usually possible. Common culprits: faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells, damaged coil wiring or connector.
• P0354 — Ignition Coil D Primary/Secondary Circuit Malfunction (P0354): a powertrain (engine/transmission) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by failed ignition coil or coil pack, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.
• P0355 — Ignition Coil E Primary/Secondary Circuit Malfunction (P0355): a powertrain (engine/transmission) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by worn spark plugs or wrong plug gap, damaged coil wiring or connector, moisture or oil in the spark plug wells.
• P0356 — Ignition Coil F Primary/Secondary Circuit Malfunction (P0356): a powertrain (engine/transmission) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by moisture or oil in the spark plug wells, failed ignition coil or coil pack, damaged coil wiring or connector.
• P0357 — Ignition Coil G Primary/Secondary Circuit Malfunction (P0357): a powertrain (engine/transmission) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by failed ignition coil or coil pack, worn spark plugs or wrong plug gap, damaged coil wiring or connector.
• P0358 — Ignition Coil H Primary/Secondary Circuit Malfunction (P0358): a powertrain (engine/transmission) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by faulty ignition control circuit in the ECM, worn spark plugs or wrong plug gap, failed ignition coil or coil pack.
• P0359 — P0359 — Ignition Coil I Primary/Secondary Circuit Malfunction. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: damaged coil wiring or connector, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.
• P0360 — P0360 — Ignition Coil J Primary/Secondary Circuit Malfunction. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: failed ignition coil or coil pack, faulty ignition control circuit in the ECM, damaged coil wiring or connector.
• P0361 — P0361 — Ignition Coil K Primary/Secondary Circuit Malfunction. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, damaged coil wiring or connector, moisture or oil in the spark plug wells.
• P0362 — OBD2 code P0362 flags a problem with the ignition system (ignition coil l primary/secondary circuit malfunction). Short, gentle driving to a shop is usually possible. Common culprits: damaged coil wiring or connector, failed ignition coil or coil pack, moisture or oil in the spark plug wells.