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

• P1745 — OBD2 code P1745 flags a problem with the automatic transmission control (torque converter clutch inductive signature malfunction). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P1746 — P1746 — Torque Converter Clutch Control Error. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: failed shift or pressure control solenoid, low or degraded transmission fluid, internal mechanical wear (clutches, torque converter).
• P1747 — Torque Converter Clutch Solenoid Failed On (P1747): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter), low or degraded transmission fluid.
• P1748 — P1748 — Torque Converter Clutch Solenoid Failied On. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: wiring or connector faults in the valve body harness, low or degraded transmission fluid, faulty transmission speed sensor.
• P1749 — Torque Converter Clutch System Performance (P1749): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter), low or degraded transmission fluid.
• P1750 — P1750 — Reverse Pressure Compensation Fault. Forward driving may be possible if the transmission otherwise operates normally, but avoid continued use if reverse slips, bangs, leaks, overheats, or fails to engage.
• P1751 — OBD2 code P1751 flags a problem with the sensor and actuator circuits (line pressure solenoid system). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, control module driver fault, blown fuse feeding the circuit.
• P1752 — P1752 — Shift Solenoid Valve A Short Circuit. If shifts remain normal, drive cautiously to a repair facility.
• P1754 — Pressure Control Solenoid "A" Open Circuit (P1754): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by valve body wear, faulty transmission speed sensor, low or degraded transmission fluid.
• P1755 — Pressure Control Solenoid "A" Short Circuit (P1755): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by faulty transmission speed sensor, failed shift or pressure control solenoid, valve body wear.
• P1756 — OBD2 code P1756 flags a problem with the sensor and actuator circuits (EPC malfunction). 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.
• P1757 — P1757 — Shift Solenoid Valve B Short Circuit. P1757 identifies an abnormal electrical path in the Shift Solenoid Valve B control circuit and can cause delayed, harsh, or incorrect shifting.
• P1758 — P1758 — Jaguar Pressure Solenoid Incorrect Current. P1758 can affect transmission pressure control.
• P1759 — P1759 — Mazda 2-4 Brake Failsafe Valve Malfunction. P1759 can leave the ABS and related stability-control functions unavailable even when basic hydraulic braking still works.
• P1760 — Pressure Control Solenoid Failed Low (P1760): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid, low or degraded transmission fluid.
• P1762 — Coast Clutch Solenoid Circuit Malfunction (P1762): a powertrain (engine/transmission) 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, control module driver fault.
• P1763 — P1763 — Towable AWD Lamp Short to Positive Supply. Have P1763 diagnosed promptly because a continuing short can damage wiring or cause a lamp failure.
• P1764 — P1764 — Towable AWD Lamp Circuit Fault. P1764 is a caution-level lamp-circuit fault and does not by itself prove that the AWD or towing system has failed.
• P1765 — Intermediate Speed Sensor (ISS) Malfunction (P1765): a powertrain (engine/transmission) 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, open or shorted wiring in the circuit.
• P1766 — P1766 — Shift Solenoid D Performance Fault. P1766 can affect shift quality and drivability, but the code alone does not establish an immediate failure.
• P1767 — OBD2 code P1767 flags a problem with the automatic transmission control (shift solenoid b performance). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.
• P1768 — P1768 — Pressure Control Solenoid "A" Short Circuit. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: valve body wear, faulty transmission speed sensor, wiring or connector faults in the valve body harness.
• P1769 — Shift Solenoid C Performance (P1769): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by wiring or connector faults in the valve body harness, valve body wear, low or degraded transmission fluid.
• P1770 — Overdrive Band Failed Off (P1770): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by poor ground connection, blown fuse feeding the circuit, control module driver fault.