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.

P2584 — OBD2 code P2584 flags a problem with the sensor and actuator circuits (fuel additive control module requested MIL illumination). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
P2587 — P2587 — Turbocharger Boost Control Position Sensor "B" Circuit Range/Performance. A fault in the turbocharger / supercharger boost control. Short, gentle driving to a shop is usually possible. Typical causes: worn turbocharger, vacuum or actuator line damage, faulty boost pressure sensor.
P2588 — OBD2 code P2588 flags a problem with the turbocharger / supercharger boost control (turbocharger boost control position sensor "B" circuit low). Short, gentle driving to a shop is usually possible. Common culprits: worn turbocharger, boost leak in intercooler piping or hoses, clogged intake or exhaust (DPF/cat).
P2589 — Turbocharger Boost Control Position Sensor "B" Circuit High (P2589): a powertrain (engine/transmission) fault affecting the turbocharger / supercharger boost control. Short, gentle driving to a shop is usually possible. Most often caused by worn turbocharger, vacuum or actuator line damage, boost leak in intercooler piping or hoses.
P258A — P258A — Vacuum Pump Control Circuit/Open. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, control module driver fault, poor ground connection.
P258B — OBD2 code P258B flags a problem with the sensor and actuator circuits (vacuum pump control range/performance). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, control module driver fault.
P258C — P258C — Vacuum Pump 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, control module driver fault, blown fuse feeding the circuit.
P258D — Vacuum Pump Control Circuit High (P258D): 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, poor ground connection, open or shorted wiring in the circuit.
P258F — P258F — Torque Management Request Output Signal. 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, open or shorted wiring in the circuit, blown fuse feeding the circuit.
P2590 — OBD2 code P2590 flags a problem with the turbocharger / supercharger boost control (turbocharger boost control position sensor "B" circuit intermittent/erratic). Short, gentle driving to a shop is usually possible. Common culprits: vacuum or actuator line damage, boost leak in intercooler piping or hoses, stuck wastegate or faulty boost control solenoid.
P2591 — OBD2 code P2591 flags a problem with the sensor and actuator circuits (cruise control front distance range sensor left). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
P2592 — Cruise Control Front Distance Range Sensor Right (P2592): 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, control module driver fault.
P2600 — Coolant Pump "A" Control Circuit/Open (P2600): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by water pump or radiator issues, low coolant level or air in the system, failed cooling fan or fan relay.
P2601 — OBD2 code P2601 flags a problem with the engine cooling and temperature control (coolant pump "A" control circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: water pump or radiator issues, low coolant level or air in the system, thermostat stuck open or closed.
P2602 — Coolant Pump "A" Control Circuit Low (P2602): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by faulty coolant temperature sensor, water pump or radiator issues, thermostat stuck open or closed.
P2603 — OBD2 code P2603 flags a problem with the engine cooling and temperature control (coolant pump "A" control circuit high). Short, gentle driving to a shop is usually possible. Common culprits: thermostat stuck open or closed, failed cooling fan or fan relay, faulty coolant temperature sensor.
P2604 — P2604 — Intake Air Heater "A" Circuit Range/Performance. 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, intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor.
P2605 — P2605 — Intake Air Heater "B" Circuit/Open. 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, dirty throttle body or stuck throttle plate, failed electronic throttle motor.
P2606 — P2606 — Intake Air Heater "B" Circuit Range/Performance. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: faulty throttle position sensor or pedal sensor, failed electronic throttle motor, intake air leaks after the MAF sensor.
P2607 — OBD2 code P2607 flags a problem with the throttle and intake air metering (intake air heater "B" circuit low). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, dirty throttle body or stuck throttle plate, faulty throttle position sensor or pedal sensor.
P2608 — Intake Air Heater "B" Circuit High (P2608): 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, contaminated or failed MAF/MAP sensor, faulty throttle position sensor or pedal sensor.
P2609 — Intake Air Heater System Performance (P2609): 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, faulty throttle position sensor or pedal sensor, failed electronic throttle motor.
P260A — OBD2 code P260A flags a problem with the sensor and actuator circuits (PTO control circuit /open). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, open or shorted wiring in the circuit.
P260B — OBD2 code P260B flags a problem with the sensor and actuator circuits (PTO control circuit low). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, control module driver fault.