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

• B1680 — Alarm Panic Input Circuit Short To Ground (B1680): 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, blown fuse or failed relay, body control module (BCM) fault.
• B1681 — PATS Transceiver Module Signal Is Not Received (B1681): 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, corroded or loose connectors.
• B1682 — PATS Is Disabled (Check Link Between PATS And Transponder) (B1682): 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, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1683 — OBD2 code B1683 flags a problem with the body electrical system (mirror driver/passenger switch circuit 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, corroded or loose connectors.
• B1684 — B1684 — Mirror Driver/Passenger Switch Circuit Open. 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, blown fuse or failed relay.
• B1685 — OBD2 code B1685 flags a problem with the body electrical system (lamp dome input circuit failure). 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.
• B1686 — B1686 — Lamp Dome Input Circuit Open. 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, corroded or loose connectors.
• B1687 — Lamp Dome Input Circuit Short To Battery (B1687): 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.
• B1688 — B1688 — Lamp Dome Input Circuit Short 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, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1689 — OBD2 code B1689 flags a problem with the body electrical system (autolamp delay circuit 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.
• B1690 — Autolamp Delay Circuit Open (B1690): 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, corroded or loose connectors.
• B1691 — OBD2 code B1691 flags a problem with the body electrical system (autolamp delay circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, blown fuse or failed relay, corroded or loose connectors.
• B1692 — OBD2 code B1692 flags a problem with the body electrical system (autolamp delay circuit short to ground). 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, corroded or loose connectors.
• B1693 — B1693 — Autolamp On Circuit Failure. 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.
• B1694 — Autolamp On Circuit Open (B1694): 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.
• B1695 — OBD2 code B1695 flags a problem with the body electrical system (autolamp on circuit short to battery). 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.
• B1696 — OBD2 code B1696 flags a problem with the body electrical system (autolamp on circuit short to ground). 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.
• B1697 — Mirror Driver/Passenger Switch Circuit Short To Battery (B1697): 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, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1698 — OBD2 code B1698 flags a problem with the body electrical system (mirror driver/passenger switch 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, body control module (BCM) fault.
• B1699 — OBD2 code B1699 flags a problem with the airbag / restraint system (SRS) (B1699 — seatbelt passenger pretensioner circuit short to battery: causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: damaged wiring under seats or in the steering column, faulty impact or occupancy sensor, depleted backup battery or low system voltage.
• B1700 — OBD2 code B1700 flags a problem with the airbag / restraint system (SRS) (B1700 — seatbelt passenger pretensioner circuit short to ground: causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: faulty impact or occupancy sensor, depleted backup battery or low system voltage, damaged wiring under seats or in the steering column.
• B1701 — B1701 — Seat Driver Recline Forward Switch Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1702 — OBD2 code B1702 flags a problem with the body electrical system (seat driver recline forward switch circuit open). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B1703 — B1703 — Seat Driver Recline Forward Switch 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, blown fuse or failed relay.