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

• B1584 — OBD2 code B1584 flags a problem with the body electrical system (dim panel decrease input circuit open). 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.
• B1585 — Dim Panel Decrease Input Circuit Short To Battery (B1585): 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.
• B1586 — Dim Panel Decrease Input Circuit Short To Ground (B1586): 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.
• B1587 — B1587 — Autolamp Delay Increase 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, damaged wiring in door jambs or wet areas, body control module (BCM) fault.
• B1588 — Autolamp Delay Increase Circuit Open (B1588): 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, damaged wiring in door jambs or wet areas, body control module (BCM) fault.
• B1589 — B1589 — Autolamp Delay Increase 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, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B1590 — Autolamp Delay Increase Circuit Short To Ground (B1590): 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, faulty switch, motor or actuator of the affected system.
• B1591 — OBD2 code B1591 flags a problem with the body electrical system (autolamp delay decrease 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, faulty switch, motor or actuator of the affected system.
• B1592 — B1592 — Autolamp Delay Decrease 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, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1593 — OBD2 code B1593 flags a problem with the body electrical system (autolamp delay decrease circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
• B1594 — Autolamp Delay Decrease Circuit Short To Ground (B1594): 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.
• B1595 — Ignition Switch Illegal Input Code (B1595): a body electrical fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by worn spark plugs or wrong plug gap, moisture or oil in the spark plug wells, failed ignition coil or coil pack.
• B1596 — OBD2 code B1596 flags a problem with the body electrical system (service continuous codes). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, body control module (BCM) fault, corroded or loose connectors.
• B1597 — B1597 — Autolamp Sensor Input Circuit Short To Ground: Causes, Symptoms & Fix (B1597): a vehicle 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, corroded or loose connectors.
• B1598 — B1598 — B1598 — Lamp Headlamp Low-Beam Circuit Failure: Causes, Symptoms & Fix. 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, blown fuse or failed relay, corroded or loose connectors.
• B1599 — B1599 — B1599 — Lamp Headlamp Low-Beam Circuit Open: Causes, Symptoms & Fix. 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.
• B1600 — B1600 — PATS Ignition Key Transponder Signal Is Not Received. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: damaged coil wiring or connector, moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM.
• B1601 — OBD2 code B1601 flags a problem with the ignition system (PATS received incorrect key-code from ignition key transponder). Short, gentle driving to a shop is usually possible. Common culprits: damaged coil wiring or connector, failed ignition coil or coil pack, moisture or oil in the spark plug wells.
• B1602 — OBD2 code B1602 flags a problem with the ignition system (PATS received invalid format of key-code from ignition key transponder). Short, gentle driving to a shop is usually possible. Common culprits: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, moisture or oil in the spark plug wells.
• B1603 — Lamp Anti-Theft Indicator Circuit Failure (B1603): 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, corroded or loose connectors.
• B1604 — B1604 — Lamp Anti-Theft Indicator 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, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
• B1605 — Lamp Anti-Theft Indicator Circuit Short To Battery (B1605): 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.
• B1606 — B1606 — Lamp Anti-Theft Indicator 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, blown fuse or failed relay.
• B1607 — OBD2 code B1607 flags a problem with the body electrical system (illuminated entry input circuit failure). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.