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

• B1776 — B1776 — Mirror Driver Up Circuit 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, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1777 — B1777 — B1777 — Seat Driver Backward Circuit Failure: Causes, Symptoms & Fix. 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.
• B1778 — B1778 — Mirror Driver Down Circuit Failure. 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, damaged wiring in door jambs or wet areas.
• B1779 — Mirror Driver Down Circuit Open (B1779): 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, faulty switch, motor or actuator of the affected system.
• B1780 — Mirror Driver Down Circuit Short To Battery (B1780): 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.
• B1781 — Mirror Driver Down Short To Ground (B1781): 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, corroded or loose connectors, body control module (BCM) fault.
• B1782 — Mirror Passenger Up Circuit Failure (B1782): 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, damaged wiring in door jambs or wet areas.
• B1783 — Mirror Passenger Up Circuit Open (B1783): 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.
• B1784 — B1784 — Mirror Passenger Up Circuit Short To Battery. 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, body control module (BCM) fault.
• B1785 — Mirror Passenger Up Circuit Short To Ground (B1785): 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, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1786 — OBD2 code B1786 flags a problem with the body electrical system (mirror passenger down circuit failure). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B1787 — B1787 — Mirror Passenger Down 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, blown fuse or failed relay.
• B1788 — Mirror Passenger Down Circuit Short To Battery (B1788): 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.
• B1789 — B1789 — Mirror Passenger Down 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.
• B1790 — B1790 — Autolamp Sensor Input 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, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1791 — B1791 — Autolamp Sensor Input Circuit Open. 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, faulty switch, motor or actuator of the affected system.
• B1792 — Autolamp Sensor Input Circuit Short To Battery (B1792): 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, body control module (BCM) fault, corroded or loose connectors.
• B1793 — B1793 — Autolamp Sensor Input Circuit Short To Ground. 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.
• B1794 — B1794 — Lamp Headlamp Low-Beam 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, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1795 — OBD2 code B1795 flags a problem with the body electrical system (lamp headlamp low-beam circuit open). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1796 — B1796 — Lamp Headlamp Low-Beam 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, damaged wiring in door jambs or wet areas.
• B1797 — OBD2 code B1797 flags a problem with the body electrical system (lamp headlamp low-beam 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.
• B1798 — Lamp Turn Signal Front Output Circuit Failure (B1798): 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.
• B1799 — B1799 — Lamp Turn Signal Front Output 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, damaged wiring in door jambs or wet areas, blown fuse or failed relay.