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

• C1740 — C1740 — Right Front Center Sensor Circuit Failure. 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, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• C1741 — Right Front Center Sensor Circuit Fault (C1741): 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, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• C1742 — C1742 — Rear Sounder Circuit Failure. 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, blown fuse feeding the circuit, poor ground connection.
• C1743 — Rear Sounder Circuit Short to Vbatt (C1743): 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, control module driver fault, corroded, loose or damaged connector.
• C1744 — OBD2 code C1744 flags a problem with the sensor and actuator circuits (front sounder circuit failure). 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.
• C1745 — Front Sounder Circuit Short to Vbatt (C1745): 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, blown fuse feeding the circuit.
• C1748 — OBD2 code C1748 flags a problem with the sensor and actuator circuits (switch input circuit short to gnd). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• C1749 — C1749 — Trailer Input Circuit Failure. 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, open or shorted wiring in the circuit, control module driver fault.
• C1750 — OBD2 code C1750 flags a problem with the sensor and actuator circuits (accelerator position sensor out of range). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.
• C1751 — OBD2 code C1751 flags a problem with the sensor and actuator circuits (vehicle speed sensor # 1 output circuit short to vbatt). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, corroded, loose or damaged connector.
• C1752 — Vehicle Speed Sensor # 1 Output Circuit Short to Gnd (C1752): 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, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• C1753 — Hydraulic Clutch Actuator Valve Signal Fault (C1753): 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, open or shorted wiring in the circuit, poor ground connection.
• C1754 — C1754 — Hydraulic Clutch Actuator Valve 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, corroded, loose or damaged connector, control module driver fault.
• C1755 — Power Limit Shutdown Fault (C1755): 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, control module driver fault, faulty sensor or actuator of the affected circuit.
• C1756 — C1756 — Air Suspension Front Height Sensor High (SE) Signal Circuit Failure. 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, poor ground connection, corroded, loose or damaged connector.
• C1757 — Air Suspension Front Height Sensor High (SE) Signal Circuit Open (C1757): 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, faulty sensor or actuator of the affected circuit.
• C1758 — Air Suspension Front Height Sensor High (SE) Signal Circuit Short To Battery (C1758): 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, control module driver fault, corroded, loose or damaged connector.
• C1759 — Air Suspension Front Height Sensor High (SE) Signal Circuit Short To Ground (C1759): 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, blown fuse feeding the circuit.
• C1760 — OBD2 code C1760 flags a problem with the sensor and actuator circuits (air suspension rear height sensor high (SE) signal circuit failure). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• C1761 — OBD2 code C1761 flags a problem with the sensor and actuator circuits (air suspension rear height sensor high (SE) signal circuit open). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, poor ground connection, corroded, loose or damaged connector.
• C1762 — Air Suspension Rear Height Sensor High (SE) Signal Circuit Short To Battery (C1762): 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, control module driver fault, blown fuse feeding the circuit.
• C1763 — OBD2 code C1763 flags a problem with the sensor and actuator circuits (air suspension rear height sensor high (SE) signal circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, poor ground connection.
• C1765 — Air Suspension Rear Height Sensor Low Signal Circuit Failure (C1765): 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, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• C1766 — OBD2 code C1766 flags a problem with the sensor and actuator circuits (air suspension rear height sensor low signal circuit open). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, control module driver fault, open or shorted wiring in the circuit.