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

• P074F — OBD2 code P074F flags a problem with the sensor and actuator circuits (unable to engage gear 7). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P0750 — OBD2 code P0750 flags a problem with the automatic transmission control (shift solenoid a malfunction). Short, gentle driving to a shop is usually possible. Common culprits: internal mechanical wear (clutches, torque converter), valve body wear, low or degraded transmission fluid.
• P0751 — Shift Solenoid A Performance or Stuck Off (P0751): 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, low or degraded transmission fluid.
• P0752 — P0752 — Shift Solenoid A Stuck 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, internal mechanical wear (clutches, torque converter).
• P0753 — P0753 — Shift Solenoid A Electrical. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: failed shift or pressure control solenoid, faulty transmission speed sensor, low or degraded transmission fluid.
• P0754 — Shift Solenoid A Intermittent (P0754): 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, internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid.
• P0755 — P0755 — Shift Solenoid B Malfunction. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter), wiring or connector faults in the valve body harness.
• P0756 — OBD2 code P0756 flags a problem with the automatic transmission control (shift solenoid b performance or stock off). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, wiring or connector faults in the valve body harness, valve body wear.
• P0757 — P0757 — Shift Solenoid B Stuck On. 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, faulty transmission speed sensor.
• P0758 — OBD2 code P0758 flags a problem with the automatic transmission control (shift solenoid b electrical). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, low or degraded transmission fluid, failed shift or pressure control solenoid.
• P0759 — P0759 — Shift Solenoid B Intermittent. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: low or degraded transmission fluid, valve body wear, wiring or connector faults in the valve body harness.
• P075A — OBD2 code P075A flags a problem with the automatic transmission control (shift solenoid g malfunction). Short, gentle driving to a shop is usually possible. Common culprits: wiring or connector faults in the valve body harness, faulty transmission speed sensor, low or degraded transmission fluid.
• P075B — P075B — Shift Solenoid G Performance/Stuck Off. 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, faulty transmission speed sensor, valve body wear.
• P075C — Shift Solenoid G Stuck On (P075C): 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, low or degraded transmission fluid, failed shift or pressure control solenoid.
• P075D — OBD2 code P075D flags a problem with the automatic transmission control (shift solenoid g electrical). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, low or degraded transmission fluid, failed shift or pressure control solenoid.
• P075E — OBD2 code P075E flags a problem with the automatic transmission control (shift solenoid g intermittent). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter).
• P075F — OBD2 code P075F flags a problem with the automatic transmission control (transmission fluid level too high). Short, gentle driving to a shop is usually possible. Common culprits: internal mechanical wear (clutches, torque converter), wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P0760 — OBD2 code P0760 flags a problem with the automatic transmission control (shift solenoid c 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, valve body wear.
• P0761 — OBD2 code P0761 flags a problem with the automatic transmission control (shift solenoid c performance or stuck off). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter).
• P0762 — Shift Solenoid C Stuck On (P0762): 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, faulty transmission speed sensor.
• P0763 — OBD2 code P0763 flags a problem with the automatic transmission control (shift solenoid c electrical). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, faulty transmission speed sensor, wiring or connector faults in the valve body harness.
• P0764 — Shift Solenoid C Intermittent (P0764): 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, low or degraded transmission fluid, valve body wear.
• P0765 — P0765 — Shift Solenoid D Malfunction. 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, faulty transmission speed sensor, internal mechanical wear (clutches, torque converter).
• P0766 — OBD2 code P0766 flags a problem with the automatic transmission control (shift solenoid d performance or stuck off). Short, gentle driving to a shop is usually possible. Common culprits: wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid.