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

• B1944 — B1944 — Air Bag Crash Sensor #1 Ground 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, depleted backup battery or low system voltage, failed clockspring (driver airbag circuit).
• B1945 — B1945 — Air Bag Crash Sensor #2 Ground Circuit Open. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: SRS control module fault or stored crash data, damaged wiring under seats or in the steering column, failed clockspring (driver airbag circuit).
• B1946 — B1946 — Climate Control A/C Post Evaporator Sensor Circuit Failure. A fault in the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Typical causes: cracked EVAP hoses or lines, faulty purge valve (canister purge solenoid), faulty vent valve or leak detection pump.
• B1947 — OBD2 code B1947 flags a problem with the evaporative emission (EVAP) system (climate control A/C post evaporator sensor circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: loose, damaged or wrong fuel cap, faulty purge valve (canister purge solenoid), faulty vent valve or leak detection pump.
• B1948 — OBD2 code B1948 flags a problem with the body electrical system (climate control water temperature sensor circuit failure). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1949 — B1949 — Climate Control Water Temperature Sensor Circuit Short To Ground. 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, blown fuse or failed relay.
• B1950 — B1950 — Seat Rear Up/Down Potentiometer Feedback 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.
• B1951 — B1951 — Seat Rear Up/Down Potentiometer Feedback 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, body control module (BCM) fault.
• B1952 — OBD2 code B1952 flags a problem with the body electrical system (seat rear up/down potentiometer feedback circuit short to battery). 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.
• B1953 — OBD2 code B1953 flags a problem with the body electrical system (seat rear up/down potentiometer feedback circuit short to ground). 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.
• B1954 — OBD2 code B1954 flags a problem with the body electrical system (seat front up/down potentiometer feedback circuit failure). 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, damaged wiring in door jambs or wet areas.
• B1955 — Seat Front Up/Down Potentiometer Feedback Circuit Open (B1955): 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.
• B1956 — Seat Front Up/Down Potentiometer Feedback Circuit Short To Battery (B1956): 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, corroded or loose connectors.
• B1957 — Seat Front Up/Down Potentiometer Feedback Circuit Short To Ground (B1957): 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, corroded or loose connectors.
• B1958 — OBD2 code B1958 flags a problem with the body electrical system (seat recline forward/backward potentiometer feedback circuit failure). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.
• B1959 — Seat Recline Forward/Backward Potentiometer Feedback Circuit Open (B1959): 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, blown fuse or failed relay.
• B1960 — B1960 — Seat Recline Forward/Backward Potentiometer Feedback 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1961 — Seat Recline Forward/Backward Potentiometer Feedback Circuit Short To Ground (B1961): 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, blown fuse or failed relay.
• B1962 — B1962 — Seat Horizontal Forward/Rearward Potentiometer Feedback 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, body control module (BCM) fault.
• B1963 — Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Open (B1963): 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.
• B1964 — OBD2 code B1964 flags a problem with the body electrical system (seat horizontal forward/rearward potentiometer feedback circuit short to battery). 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.
• B1965 — B1965 — Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Short To Ground. 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.
• B1966 — B1966 — A/C Post Heater Sensor 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, blown fuse or failed relay, body control module (BCM) fault.
• B1967 — B1967 — A/C Post Heater Sensor Circuit Short To Ground. 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, blown fuse or failed relay.