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.

B1296 — OBD2 code B1296 flags a problem with the body electrical system (power supply sensor circuit failure). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, corroded or loose connectors, body control module (BCM) fault.
B1297 — Power Supply Sensor Circuit Open (B1297): 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
B1298 — Power Supply Sensor Circuit Short To Battery (B1298): 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.
B1299 — Power Supply Sensor Circuit Short To Ground (B1299): 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, faulty switch, motor or actuator of the affected system.
B1300 — Power Door Lock Circuit Failure (B1300): 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.
B1301 — B1301 — Power Door Lock 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, corroded or loose connectors, damaged wiring in door jambs or wet areas.
B1302 — OBD2 code B1302 flags a problem with the ignition system (accessory delay relay coil circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: failed ignition coil or coil pack, damaged coil wiring or connector, worn spark plugs or wrong plug gap.
B1303 — Accessory Delay Relay Coil Circuit Open (B1303): 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, faulty ignition control circuit in the ECM, damaged coil wiring or connector.
B1304 — Accessory Delay Relay Coil Circuit Short To Battery (B1304): 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, failed ignition coil or coil pack, worn spark plugs or wrong plug gap.
B1305 — Accessory Delay Relay Coil Circuit Short To Ground (B1305): a body electrical 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, moisture or oil in the spark plug wells, failed ignition coil or coil pack.
B1306 — Oil Level Switch Circuit Open (B1306): 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, corroded or loose connectors.
B1307 — Oil Level Switch Circuit Short To Battery (B1307): 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, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
B1308 — Oil Level Switch Circuit Short To Ground (B1308): 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, body control module (BCM) fault, blown fuse or failed relay.
B1309 — OBD2 code B1309 flags a problem with the body electrical system (power door lock circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.
B1310 — Power Door Unlock Circuit Failure (B1310): 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
B1311 — Power Door Unlock Circuit Open (B1311): 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.
B1312 — Lamp Headlamp Input Circuit Short To Battery (B1312): 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, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
B1313 — OBD2 code B1313 flags a problem with the ignition system (battery saver relay coil circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: moisture or oil in the spark plug wells, damaged coil wiring or connector, worn spark plugs or wrong plug gap.
B1314 — Battery Saver Relay Coil Circuit Open (B1314): 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, worn spark plugs or wrong plug gap, failed ignition coil or coil pack.
B1315 — B1315 — Battery Saver Relay Coil Circuit Short To Battery. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: faulty ignition control circuit in the ECM, worn spark plugs or wrong plug gap, damaged coil wiring or connector.
B1316 — B1316 is a body electrical trouble code triggered when the control unit detects the battery saver relay coil circuit shorted to ground. The fault can cause hard starting, misfires, reduced power, and increased fuel consumption. Most cases are safe to drive short distances to a repair shop, but flashing CEL indicates you should stop immediately—ongoing misfires can destroy the catalytic converter.
B1317 — B1317 — Battery Voltage High. 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.
B1318 — B1318 — Battery Voltage Low. 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.
B1319 — Driver Door Ajar Circuit Failure (B1319): 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, body control module (BCM) fault, damaged wiring in door jambs or wet areas.