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

• B1344 — Heated Backlite Input Circuit Open (B1344): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by body control module (BCM) fault, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1345 — OBD2 code B1345 flags a problem with the body electrical system (heated backlite input circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B1346 — B1346 — Heated Backlite Input Circuit Short To Battery. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: damaged wiring in door jambs or wet areas, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1347 — Heated Backlite Relay Circuit Failure (B1347): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by corroded or loose connectors, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1348 — OBD2 code B1348 flags a problem with the body electrical system (heated backlite relay circuit open). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1349 — OBD2 code B1349 flags a problem with the body electrical system (heated backlite relay short to battery). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1350 — Heated Backlite Relay Short To Ground (B1350): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system, corroded or loose connectors.
• B1351 — B1351 — Ignition Key-In Circuit Short To Battery. 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.
• B1352 — Ignition Key-In Circuit Failure (B1352): a body electrical 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, damaged coil wiring or connector, failed ignition coil or coil pack.
• B1353 — OBD2 code B1353 flags a problem with the ignition system (ignition key-in circuit open). 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.
• B1354 — OBD2 code B1354 flags a problem with the ignition system (ignition key-in circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: failed ignition coil or coil pack, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.
• B1355 — B1355 — Ignition Run Circuit Failure. 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, failed ignition coil or coil pack.
• B1356 — OBD2 code B1356 flags a problem with the ignition system (ignition run circuit open). Short, gentle driving to a shop is usually possible. Common culprits: damaged coil wiring or connector, moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap.
• B1357 — OBD2 code B1357 flags a problem with the ignition system (ignition run circuit short to battery). Short, gentle driving to a shop is usually possible. Common culprits: failed ignition coil or coil pack, moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM.
• B1358 — OBD2 code B1358 flags a problem with the ignition system (ignition run circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: failed ignition coil or coil pack, worn spark plugs or wrong plug gap, moisture or oil in the spark plug wells.
• B1359 — OBD2 code B1359 flags a problem with the ignition system (ignition run/acc circuit failure). 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.
• B1360 — B1360 — Ignition Run/Acc Circuit Open. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, moisture or oil in the spark plug wells, failed ignition coil or coil pack.
• B1361 — Ignition Run/Acc Circuit Short To Battery (B1361): a body electrical fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by failed ignition coil or coil pack, moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM.
• B1362 — B1362 — Ignition Run/Acc Circuit Short To Ground. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.
• B1363 — B1363 — Ignition Start Circuit Failure. 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, moisture or oil in the spark plug wells.
• B1364 — OBD2 code B1364 flags a problem with the ignition system (ignition start circuit open). Short, gentle driving to a shop is usually possible. Common culprits: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, moisture or oil in the spark plug wells.
• B1365 — Ignition Start Circuit Short To Battery (B1365): a body electrical fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by damaged coil wiring or connector, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.
• B1366 — Ignition Start Circuit Short To Ground (B1366): a body electrical 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.
• B1367 — B1367 — Ignition Tach Circuit Failure. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, moisture or oil in the spark plug wells.