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.

C1849 — OBD2 code C1849 flags a problem with the sensor and actuator circuits (master cylinder pressure out of range). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, blown fuse feeding the circuit.
C1850 — OBD2 code C1850 flags a problem with the sensor and actuator circuits (air suspension warning lamp circuit failure). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, corroded, loose or damaged connector, open or shorted wiring in the circuit.
C1851 — C1851 — Air Suspension Warning Lamp Circuit Open. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, blown fuse feeding the circuit, control module driver fault.
C1852 — OBD2 code C1852 flags a problem with the sensor and actuator circuits (air suspension warning lamp circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, faulty sensor or actuator of the affected circuit.
C1853 — Air Suspension Warning Lamp Circuit Short To Ground (C1853): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by open or shorted wiring in the circuit, poor ground connection, corroded, loose or damaged connector.
C1854 — C1854 — Motor Temperature Out of Range. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, control module driver fault, faulty sensor or actuator of the affected circuit.
C1855 — OBD2 code C1855 flags a problem with the sensor and actuator circuits (acceleration position sensor conflict). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, control module driver fault.
C1856 — C1856 — Traction Motor Encoder circuit Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, faulty ABS module or pump motor.
C1859 — OBD2 code C1859 flags a problem with the sensor and actuator circuits (PRNDL input #2 circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, poor ground connection.
C1860 — C1860 — PRNDL Input #3 Circuit Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, control module driver fault, corroded, loose or damaged connector.
C1861 — OBD2 code C1861 flags a problem with the sensor and actuator circuits (PRNDL input #4 circuit failure). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
C1862 — OBD2 code C1862 flags a problem with the sensor and actuator circuits (contactor circuit failure). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, control module driver fault, corroded, loose or damaged connector.
C1863 — External Charging Fault (C1863): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, control module driver fault.
C1864 — C1864 — Battery Module Fault. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
C1865 — Air Suspension Rear Inflator Solenoid Output Circuit Failure (C1865): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by poor ground connection, open or shorted wiring in the circuit, corroded, loose or damaged connector.
C1866 — Air Suspension Rear Inflator Solenoid Output Circuit Open (C1866): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, poor ground connection, control module driver fault.
C1867 — Air Suspension Rear Inflator Solenoid Output Circuit Short To Battery (C1867): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by blown fuse feeding the circuit, poor ground connection, corroded, loose or damaged connector.
C1868 — OBD2 code C1868 flags a problem with the sensor and actuator circuits (air suspension rear inflator solenoid output circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, poor ground connection.
C1869 — C1869 — Air Suspension Gate Solenoid Output Circuit Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, open or shorted wiring in the circuit, poor ground connection.
C1870 — Air Suspension Gate Solenoid Output Circuit Open (C1870): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, control module driver fault, blown fuse feeding the circuit.
C1871 — Air Suspension Gate Solenoid Output Circuit Short To Battery (C1871): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, blown fuse feeding the circuit, poor ground connection.
C1872 — OBD2 code C1872 flags a problem with the sensor and actuator circuits (air suspension gate solenoid output circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, blown fuse feeding the circuit.
C1873 — C1873 — Air Suspension RF Air Spring Solenoid Output Circuit Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, poor ground connection, corroded, loose or damaged connector.
C1874 — Air Suspension RF Air Spring Solenoid Output Circuit Open (C1874): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by open or shorted wiring in the circuit, poor ground connection, corroded, loose or damaged connector.