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

• P0877 — P0877 — Transmission Fluid Pressure Sensor/Switch "D" Circuit Low. 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, internal mechanical wear (clutches, torque converter).
• P0878 — OBD2 code P0878 flags a problem with the automatic transmission control (transmission fluid pressure sensor/switch "D" circuit high). 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, internal mechanical wear (clutches, torque converter).
• P0879 — P0879 — Transmission Fluid Pressure Sensor/Switch "D" Circuit Intermittent. 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.
• P0880 — OBD2 code P0880 flags a problem with the sensor and actuator circuits (TCM power input signal). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, corroded, loose or damaged connector.
• P0881 — OBD2 code P0881 flags a problem with the sensor and actuator circuits (TCM power input signal range/performance). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, control module driver fault, blown fuse feeding the circuit.
• P0882 — P0882 — TCM Power Input Signal Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P0883 — P0883 — TCM Power Input Signal High. 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, poor ground connection, control module driver fault.
• P0884 — OBD2 code P0884 flags a problem with the sensor and actuator circuits (TCM power input signal intermittent). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, open or shorted wiring in the circuit.
• P0885 — OBD2 code P0885 flags a problem with the sensor and actuator circuits (TCM power relay control circuit/open). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit, control module driver fault.
• P0886 — P0886 — TCM Power Relay Control Circuit Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• P0887 — P0887 — TCM Power Relay Control Circuit High. 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, poor ground connection, open or shorted wiring in the circuit.
• P0888 — P0888 — TCM Power Relay Sense Circuit. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P0889 — TCM Power Relay Sense Circuit Range/Performance (P0889): 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, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P088A — P088A — Transmission Fluid Filter Deteriorated. 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.
• P088B — P088B — Transmission Fluid Filter Very Deteriorated. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: faulty transmission speed sensor, wiring or connector faults in the valve body harness, valve body wear.
• P0890 — TCM Power Relay Sense Circuit Low (P0890): 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 faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P0891 — OBD2 code P0891 flags a problem with the sensor and actuator circuits (TCM power relay sense circuit high). 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, corroded, loose or damaged connector.
• P0892 — TCM Power Relay Sense Circuit Intermittent (P0892): 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, blown fuse feeding the circuit.
• P0893 — OBD2 code P0893 flags a problem with the sensor and actuator circuits (multiple gears engaged). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, control module driver fault.
• P0894 — Transmission Component Slipping (P0894): 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, wiring or connector faults in the valve body harness, valve body wear.
• P0895 — P0895 — Shift Time Too Short. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, control module driver fault, poor ground connection.
• P0896 — Shift Time Too Long (P0896): 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.
• P0897 — Transmission Fluid Deteriorated (P0897): 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, valve body wear.
• P0898 — Transmission Control System MIL Request Circuit Low (P0898): 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, internal mechanical wear (clutches, torque converter), valve body wear.