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

• P1568 — OBD2 code P1568 flags a problem with the sensor and actuator circuits (IMCC circuit malfunction). 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.
• P1569 — P1569 — Intake Manifold Control Circuit Fault. P1569 can affect idle control, acceleration, and power delivery.
• P1570 — P1570 — Intake Manifold Control Circuit. If the engine runs smoothly and P1570 is only stored, limited driving may be reasonable.
• P1571 — PSPS Out Of Self Test Range (P1571): 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, poor ground connection, blown fuse feeding the circuit.
• P1572 — Speed Control Command Switch Out of Range High (P1572): 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, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• P1573 — Speed Control Command Switch Out of Range Low (P1573): 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 control module driver fault, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• P1574 — Speed Control Output Circuit Continuity (P1574): 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, poor ground connection, control module driver fault.
• P1575 — OBD2 code P1575 flags a problem with the sensor and actuator circuits (speed control unable to hold speed). 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.
• P1576 — Brake Switch Malfunction (P1576): a powertrain (engine/transmission) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, faulty ABS module or pump motor.
• P1579 — Throttle Position Sensor Disagreement btwn Sensors (P1579): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by faulty throttle position sensor or pedal sensor, wiring or connector faults in the throttle circuit, dirty throttle body or stuck throttle plate.
• P1580 — OBD2 code P1580 flags a problem with the sensor and actuator circuits (pedal position out of self test range). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P1581 — OBD2 code P1581 flags a problem with the sensor and actuator circuits (pedal position not available). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, blown fuse feeding the circuit, control module driver fault.
• P1582 — OBD2 code P1582 flags a problem with the sensor and actuator circuits (pedal position sensor disagreement btwn sensors). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, corroded, loose or damaged connector, poor ground connection.
• P1583 — OBD2 code P1583 flags a problem with the sensor and actuator circuits (ETC power less than demand). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• P1584 — P1584 — ETC In Power Limiting Mode. 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, poor ground connection.
• P1585 — P1585 — Electronic Throttle Monitor PCM Override. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor, dirty throttle body or stuck throttle plate.
• P1586 — Electronic Throttle Monitor Malfunction (P1586): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by failed electronic throttle motor, wiring or connector faults in the throttle circuit, faulty throttle position sensor or pedal sensor.
• P1588 — P1588 — Electronic Throttle Monitor Cruise Disable. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: intake air leaks after the MAF sensor, contaminated or failed MAF/MAP sensor, failed electronic throttle motor.
• P1589 — TCU Detected IPE Circuit Malfunction (P1589): 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, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• P1591 — P1591 — Cruise-Control Distance-Decrease Signal Circuit Malfunction. P1591 usually affects a cruise-control input rather than basic engine operation, so manual driving can generally continue with cruise disabled.
• P1592 — P1592 — Vehicle Data Recorder Data Unavailable. P1592 usually affects recorder data recording or retrieval rather than basic propulsion, so the vehicle may remain drivable.
• P1600 — Throttle Control Unit Malfunction (P1600): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by dirty throttle body or stuck throttle plate, failed electronic throttle motor, faulty throttle position sensor or pedal sensor.
• P1601 — P1601 — Throttle Control Unit Throttle Position Malfunction. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: dirty throttle body or stuck throttle plate, failed electronic throttle motor, intake air leaks after the MAF sensor.
• P1603 — OBD2 code P1603 flags a problem with the throttle and intake air metering (throttle control unit detected loss of return spring). Short, gentle driving to a shop is usually possible. Common culprits: dirty throttle body or stuck throttle plate, intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor.