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.

C1924 — VAPS Solenoid Actuator Output Circuit Short To Ground (C1924): 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 faulty sensor or actuator of the affected circuit, poor ground connection, corroded, loose or damaged connector.
C1925 — VAPS Solenoid Actuator Return Circuit Failure (C1925): 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 control module driver fault, poor ground connection, open or shorted wiring in the circuit.
C1926 — OBD2 code C1926 flags a problem with the sensor and actuator circuits (VAPS solenoid actuator return circuit open). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, control module driver fault, faulty sensor or actuator of the affected circuit.
C1927 — OBD2 code C1927 flags a problem with the sensor and actuator circuits (VAPS solenoid actuator return circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, control module driver fault.
C1928 — OBD2 code C1928 flags a problem with the sensor and actuator circuits (VAPS solenoid actuator return circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit, poor ground connection.
C1929 — C1929 — Air Suspension Front Compressor Relay Circuit Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, control module driver fault, blown fuse feeding the circuit.
C1930 — OBD2 code C1930 flags a problem with the sensor and actuator circuits (air suspension front compressor relay circuit open). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
C1931 — OBD2 code C1931 flags a problem with the sensor and actuator circuits (air suspension front compressor relay circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, open or shorted wiring in the circuit.
C1932 — OBD2 code C1932 flags a problem with the sensor and actuator circuits (air suspension front compressor relay circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, control module driver fault.
C1933 — OBD2 code C1933 flags a problem with the sensor and actuator circuits (solenoid current out of range). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, blown fuse feeding the circuit, poor ground connection.
C1934 — HPU (Hydraulic Pump Unit) Pressurisation Failure (C1934): 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 faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, open or shorted wiring in the circuit.
C1935 — Chime Circuit Failure (C1935): 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, faulty sensor or actuator of the affected circuit, control module driver fault.
C1936 — Hydraulic Pump Relay Circuit Failure (C1936): 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, corroded, loose or damaged connector, open or shorted wiring in the circuit.
C1937 — OBD2 code C1937 flags a problem with the sensor and actuator circuits (steering wheel angle sensor offset failure). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, control module driver fault, open or shorted wiring in the circuit.
C1938 — OBD2 code C1938 flags a problem with the sensor and actuator circuits (invalid steering wheel angle sensor ID). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
C1939 — Brake Pressure Switch Input Circuit Failure (C1939): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by failed wheel speed sensor, damaged sensor wiring or corroded connector, blown fuse or low voltage to the ABS module.
C1940 — C1940 — Brake Pressure Switch Mechanical Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: blown fuse or low voltage to the ABS module, damaged tone (reluctor) ring on the hub, faulty ABS module or pump motor.
C1942 — OBD2 code C1942 flags a problem with the sensor and actuator circuits (unrecognized powertrain configuration). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, control module driver fault.
C1943 — OBD2 code C1943 flags a problem with the airbag / restraint system (SRS) (airbag deployment indication input fault). Short, gentle driving to a shop is usually possible. Common culprits: damaged wiring under seats or in the steering column, failed clockspring (driver airbag circuit), faulty impact or occupancy sensor.
C1944 — OBD2 code C1944 flags a problem with the sensor and actuator circuits (gauge driver circuit fault). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, control module driver fault, faulty sensor or actuator of the affected circuit.
C1945 — Park Switch Indicates Park with Vehicle Moving (C1945): 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 faulty sensor or actuator of the affected circuit, control module driver fault, corroded, loose or damaged connector.
C1946 — C1946 — Seat Track Position Switch Circuit Open. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: faulty sensor or actuator of the affected circuit, control module driver fault, open or shorted wiring in the circuit.
C1947 — OBD2 code C1947 flags a problem with the sensor and actuator circuits (seat track position switch circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, faulty sensor or actuator of the affected circuit, poor ground connection.
C1948 — Seat Track Position Switch Circuit Resistance Out of Range (C1948): 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 faulty sensor or actuator of the affected circuit, control module driver fault, blown fuse feeding the circuit.