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

• B1896 — B1896 — Driver's / Passenger's Door Ajar Output Circuit Short To Battery: Causes, Symptoms & Fix (B1896): a vehicle 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.
• B1897 — Horn Switch Circuit Failure (B1897): 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.
• B1898 — OBD2 code B1898 flags a problem with the body electrical system (chime input #2 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, faulty switch, motor or actuator of the affected system.
• B1899 — B1899 — Microphone Input Signal 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.
• B1900 — Driver Side Airbag Fault (B1900): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by damaged wiring under seats or in the steering column, depleted backup battery or low system voltage, faulty impact or occupancy sensor.
• B1901 — Air Bag Crash Sensor #1 Feed/Return Circuit Short To Ground (B1901): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by damaged wiring under seats or in the steering column, failed clockspring (driver airbag circuit), SRS control module fault or stored crash data.
• B1902 — Air Bag Crash Sensor #1 Ground Circuit Failure (B1902): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by damaged wiring under seats or in the steering column, SRS control module fault or stored crash data, depleted backup battery or low system voltage.
• B1903 — OBD2 code B1903 flags a problem with the airbag / restraint system (SRS) (air bag crash sensor #1 ground circuit short to battery). Short, gentle driving to a shop is usually possible. Common culprits: failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column, depleted backup battery or low system voltage.
• B1904 — Air Bag Crash Sensor #2 Feed/Return Circuit Failure (B1904): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by damaged wiring under seats or in the steering column, SRS control module fault or stored crash data, failed clockspring (driver airbag circuit).
• B1905 — B1905 — Air Bag Crash Sensor #2 Feed/Return Circuit Short To Battery. 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, faulty impact or occupancy sensor.
• B1906 — B1906 — Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: depleted backup battery or low system voltage, SRS control module fault or stored crash data, damaged wiring under seats or in the steering column.
• B1907 — Air Bag Crash Sensor #2 Ground Circuit Failure (B1907): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by damaged wiring under seats or in the steering column, faulty impact or occupancy sensor, SRS control module fault or stored crash data.
• B1908 — B1908 — Air Bag Crash Sensor #2 Ground Circuit Short To Battery. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.
• B1909 — OBD2 code B1909 flags a problem with the airbag / restraint system (SRS) (air bag crash sensor #2 ground circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: faulty impact or occupancy sensor, damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.
• B1910 — B1910 — Air Bag Diagnostic Monitor Ground Circuit Failure. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: depleted backup battery or low system voltage, SRS control module fault or stored crash data, damaged wiring under seats or in the steering column.
• B1911 — B1911 — Air Bag Diagnostic Monitor Ground Circuit Short To Battery. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: faulty impact or occupancy sensor, damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.
• B1912 — Air Bag Diagnostic Monitor Ground Circuit Short To Ground (B1912): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by depleted backup battery or low system voltage, failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column.
• B1913 — Air Bag Driver/Passenger Circuit Short To Ground (B1913): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by SRS control module fault or stored crash data, depleted backup battery or low system voltage, failed clockspring (driver airbag circuit).
• B1914 — OBD2 code B1914 flags a problem with the airbag / restraint system (SRS) (air bag crash sensors #1 / #2 circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: faulty impact or occupancy sensor, damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.
• B1915 — B1915 — Air Bag Driver Circuit Failure. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: depleted backup battery or low system voltage, SRS control module fault or stored crash data, faulty impact or occupancy sensor.
• B1916 — Air Bag Driver Circuit Short To Battery (B1916): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by damaged wiring under seats or in the steering column, faulty impact or occupancy sensor, SRS control module fault or stored crash data.
• B1917 — Air Bag Memory Clear Circuit Failure (B1917): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by SRS control module fault or stored crash data, depleted backup battery or low system voltage, failed clockspring (driver airbag circuit).
• B1918 — OBD2 code B1918 flags a problem with the airbag / restraint system (SRS) (air bag memory clear circuit open). Short, gentle driving to a shop is usually possible. Common culprits: SRS control module fault or stored crash data, damaged wiring under seats or in the steering column, failed clockspring (driver airbag circuit).
• B1919 — OBD2 code B1919 flags a problem with the airbag / restraint system (SRS) (air bag memory clear circuit short to battery). Short, gentle driving to a shop is usually possible. Common culprits: faulty impact or occupancy sensor, failed clockspring (driver airbag circuit), depleted backup battery or low system voltage.