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.

B2425 — B2425 — Remote Keyless Entry Out of Synchronization. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.
B2426 — Passenger Solar Radiation Sensor Circuit Open (B2426): 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.
B2427 — Passenger Solar Radiation Sensor Circuit Short to Ground (B2427): 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, faulty switch, motor or actuator of the affected system.
B2428 — B2428 — A/C Post Heater Sensor #2 Circuit 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
B2429 — OBD2 code B2429 flags a problem with the body electrical system (A/C post heater sensor #2 circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
B2431 — OBD2 code B2431 flags a problem with the body electrical system (transponder programming failed). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
B2432 — Drivers Seat Belt Buckle Switch Circuit Open (B2432): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by failed clockspring (driver airbag circuit), SRS control module fault or stored crash data, faulty impact or occupancy sensor.
B2433 — B2433 — Drivers Seat Belt Buckle Switch Circuit Short to Battery. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: depleted backup battery or low system voltage, damaged wiring under seats or in the steering column, failed clockspring (driver airbag circuit).
B2434 — OBD2 code B2434 flags a problem with the airbag / restraint system (SRS) (drivers seat belt buckle switch circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: damaged wiring under seats or in the steering column, SRS control module fault or stored crash data, depleted backup battery or low system voltage.
B2435 — Drivers Seat Belt Buckle Switch Resistance out of Range (B2435): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by SRS control module fault or stored crash data, faulty impact or occupancy sensor, damaged wiring under seats or in the steering column.
B2436 — B2436 — Passengers Seat Belt Buckle Switch Circuit Open. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: faulty impact or occupancy sensor, failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column.
B2437 — B2437 — Passengers Seat Belt Buckle Switch Circuit Short to Battery. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: depleted backup battery or low system voltage, failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column.
B2438 — OBD2 code B2438 flags a problem with the airbag / restraint system (SRS) (passengers seat belt buckle switch circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: depleted backup battery or low system voltage, failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column.
B2439 — OBD2 code B2439 flags a problem with the airbag / restraint system (SRS) (passengers seat belt buckle switch resistance out of range). Short, gentle driving to a shop is usually possible. Common culprits: failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.
B2440 — Passenger Side (B2440): 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, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
B2441 — Driver Side (B2441): 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, corroded or loose connectors, blown fuse or failed relay.
B2442 — Intrusion Sensor Fault (B2442): 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.
B2443 — Powertrain Performance Mode Switch Circuit failure (B2443): 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, body control module (BCM) fault.
B2444 — B2444 — Driver Side Crash Sensor Internal Fault. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: failed clockspring (driver airbag circuit), faulty impact or occupancy sensor, damaged wiring under seats or in the steering column.
B2445 — OBD2 code B2445 flags a problem with the airbag / restraint system (SRS) (passenger side crash sensor internal fault). Short, gentle driving to a shop is usually possible. Common culprits: failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column, depleted backup battery or low system voltage.
B2446 — B2446 — RESCU/VEMS Input Circuit Open. 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, body control module (BCM) fault, corroded or loose connectors.
B2447 — B2447 — RESCU/VEMS Input Circuit Short to Battery. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
B2448 — OBD2 code B2448 flags a problem with the body electrical system (RESCU/VEMS input circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
B2449 — Aux Heater Glow Plug Circuit Short to Ground (B2449): a body electrical fault affecting the diesel glow plug system. The car is usually drivable while you plan the repair. Most often caused by corroded glow plug connectors, burned-out glow plug, damaged glow plug wiring or connector.