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

• P0767 — P0767 — Shift Solenoid D 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, faulty transmission speed sensor, low or degraded transmission fluid.
• P0768 — Shift Solenoid D Electrical (P0768): 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, failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter).
• P0769 — Shift Solenoid D Intermittent (P0769): 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, wiring or connector faults in the valve body harness.
• P076A — P076A — Shift Solenoid H 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, valve body wear, wiring or connector faults in the valve body harness.
• P076B — P076B — Shift Solenoid H Performance/Stuck Off. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: valve body wear, internal mechanical wear (clutches, torque converter), faulty transmission speed sensor.
• P076C — OBD2 code P076C flags a problem with the automatic transmission control (shift solenoid h stuck on). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, failed shift or pressure control solenoid, valve body wear.
• P076D — P076D — Shift Solenoid H Electrical. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid, wiring or connector faults in the valve body harness.
• P076E — Shift Solenoid H Intermittent (P076E): 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, faulty transmission speed sensor.
• P076F — Gear 7 Incorrect Ratio (P076F): 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 open or shorted wiring in the circuit, control module driver fault, corroded, loose or damaged connector.
• P0770 — P0770 — Shift Solenoid E Malfunction. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: internal mechanical wear (clutches, torque converter), valve body wear, low or degraded transmission fluid.
• P0771 — Shift Solenoid E Performance or Stuck Off (P0771): 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, failed shift or pressure control solenoid, faulty transmission speed sensor.
• P0772 — Shift Solenoid E Stuck On (P0772): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by low or degraded transmission fluid, valve body wear, wiring or connector faults in the valve body harness.
• P0773 — Shift Solenoid E Electrical (P0773): 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), wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.
• P0774 — OBD2 code P0774 flags a problem with the automatic transmission control (shift solenoid e intermittent). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, internal mechanical wear (clutches, torque converter), wiring or connector faults in the valve body harness.
• P0775 — P0775 — Pressure Control Solenoid B Malfunction. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: internal mechanical wear (clutches, torque converter), faulty transmission speed sensor, failed shift or pressure control solenoid.
• P0776 — OBD2 code P0776 flags a problem with the automatic transmission control (pressure control solenoid b performance or stuck off). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, valve body wear, failed shift or pressure control solenoid.
• P0777 — P0777 — Pressure Control Solenoid B Stuck On. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: valve body wear, wiring or connector faults in the valve body harness, low or degraded transmission fluid.
• P0778 — Pressure Control Solenoid B Electrical (P0778): 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, failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter).
• P0779 — OBD2 code P0779 flags a problem with the automatic transmission control (pressure control solenoid b intermittent). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, internal mechanical wear (clutches, torque converter), wiring or connector faults in the valve body harness.
• P077A — P077A — Output Speed Sensor Circuit - Loss of Direction Signal. 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, blown fuse feeding the circuit.
• P077B — OBD2 code P077B flags a problem with the sensor and actuator circuits (output speed sensor circuit - direction error). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, open or shorted wiring in the circuit.
• P0780 — P0780 — Shift Malfunction. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• P0781 — OBD2 code P0781 flags a problem with the sensor and actuator circuits (1-2 shift malfunction). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
• P0782 — P0782 — 2-3 Shift Malfunction. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, corroded, loose or damaged connector, poor ground connection.