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

• B2474 — B2474 — Passenger Door Lock Switch Circuit Shorted to Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B2475 — B2475 — Passenger Door Unlock Switch Circuit Shorted to Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B2476 — OBD2 code B2476 flags a problem with the body electrical system (RADIO PRESENT SWITCH ckt failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, damaged wiring in door jambs or wet areas, body control module (BCM) fault.
• B2477 — B2477 — Module Configuration Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B2478 — OBD2 code B2478 flags a problem with the body electrical system (ANTI THEFT INPUT SIGNAL SHORT TO GROUND). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
• B2479 — BRAKE PARK SWITCH CIRCUIT SHORT TO GROUND (B2479): a body electrical fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module.
• B2480 — OBD2 code B2480 flags a problem with the body electrical system (LF CORNER LAMP OUTPUT ckt short to battery). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, body control module (BCM) fault.
• B2481 — OBD2 code B2481 flags a problem with the body electrical system (convertible top up/down switch fault). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, body control module (BCM) fault.
• B2482 — OBD2 code B2482 flags a problem with the body electrical system (RF CORNER LAMP OUTPUT ckt short to battery). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B2483 — Enable Signal Open Circuit (B2483): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by blown fuse or failed relay, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B2484 — B2484 — Disable Signal Short to Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, blown fuse or failed relay, damaged wiring in door jambs or wet areas.
• B2485 — B2485 — LF SIDE REPEATER LAMP OUTPUT Ckt 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, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B2487 — RF SIDE REPEATER LAMP OUTPUT Ckt Short to Battery (B2487): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by faulty switch, motor or actuator of the affected system, blown fuse or failed relay, body control module (BCM) fault.
• B2489 — B2489 — UNDERHOOD LAMP OUTPUT CIRCUIT Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B2490 — OBD2 code B2490 flags a problem with the body electrical system (UNDERHOOD LAMP OUTPUT CIRCUIT short to battery). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B2491 — B2491 — RF PARK LAMP OUTPUT CIRCUIT Short to Battery. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, damaged wiring in door jambs or wet areas, body control module (BCM) fault.
• B2492 — B2492 — Already Programmed (Test Mode DTC Only !!!). A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, body control module (BCM) fault, blown fuse or failed relay.
• B2493 — B2493 — LF PARK LAMP OUTPUT 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, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
• B2494 — OBD2 code B2494 flags a problem with the body electrical system (ANTI THEFT HORN OUTPUT CIRCUIT short to batt). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, corroded or loose connectors, body control module (BCM) fault.
• B2495 — ANTI THEFT HORN OUTPUT CIRCUIT Failure (B2495): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by blown fuse or failed relay, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B2496 — OBD2 code B2496 flags a problem with the body electrical system (ANTI THEFT HORN OUTPUT CIRCUIT short to gnd). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, corroded or loose connectors, body control module (BCM) fault.
• B2499 — OBD2 code B2499 flags a problem with the body electrical system (COURTESY LAMP OUTPUT failure). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, blown fuse or failed relay, body control module (BCM) fault.
• B2500 — COURTESY LAMP OUTPUT Ckt Short to Battery (B2500): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.
• B2501 — LF LAMP LOW BEAM CIRCUIT Failure (B2501): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by blown fuse or failed relay, damaged wiring in door jambs or wet areas, body control module (BCM) fault.