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.

P0081 — P0081 — Intake valve Control Solenoid Circuit (Bank 2). 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, poor ground connection.
P0082 — P0082 — Intake Valve Control Solenoid Circuit Low (Bank 2). 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, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
P0083 — OBD2 code P0083 flags a problem with the sensor and actuator circuits (intake valve control solenoid circuit high (bank 2)). 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.
P0084 — OBD2 code P0084 flags a problem with the sensor and actuator circuits (exhaust valve control solenoid circuit (bank 2)). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, poor ground connection, control module driver fault.
P0085 — OBD2 code P0085 flags a problem with the sensor and actuator circuits (exhaust valve control solenoid circuit low (bank 2)). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, blown fuse feeding the circuit.
P0086 — OBD2 code P0086 flags a problem with the sensor and actuator circuits (exhaust valve control solenoid circuit high (bank 2)). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, control module driver fault, open or shorted wiring in the circuit.
P0087 — OBD2 code P0087 flags a problem with the fuel delivery and mixture control (fuel rail/system pressure - too low). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, weak fuel pump or clogged fuel filter, contaminated or incorrect fuel.
P0088 — P0088 — Fuel Rail/System Pressure - Too High. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: clogged or leaking fuel injectors, contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture.
P0089 — Fuel Pressure Regulator 1 Performance (P0089): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by clogged or leaking fuel injectors, contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring.
P008A — OBD2 code P008A flags a problem with the fuel delivery and mixture control (low pressure fuel system pressure - too low). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator, vacuum or intake leaks skewing the mixture.
P008B — OBD2 code P008B flags a problem with the fuel delivery and mixture control (low pressure fuel system pressure - too high). Short, gentle driving to a shop is usually possible. Common culprits: vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors, contaminated or incorrect fuel.
P008C — P008C — Fuel Cooler Pump Control Circuit Open. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, open or shorted wiring in the circuit, corroded, loose or damaged connector.
P008D — OBD2 code P008D flags a problem with the sensor and actuator circuits (fuel cooler pump control circuit low). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, corroded, loose or damaged connector.
P008E — Fuel Cooler Pump Control Circuit High (P008E): 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, control module driver fault, blown fuse feeding the circuit.
P008F — OBD2 code P008F flags a problem with the engine cooling and temperature control (engine coolant temperature/fuel temperature correlation). Short, gentle driving to a shop is usually possible. Common culprits: thermostat stuck open or closed, wiring faults in the sensor circuit, failed cooling fan or fan relay.
P0090 — OBD2 code P0090 flags a problem with the fuel delivery and mixture control (fuel pressure regulator 1 control circuit). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring, contaminated or incorrect fuel.
P0091 — Fuel Pressure Regulator 1 Control Circuit Low (P0091): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by weak fuel pump or clogged fuel filter, vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator.
P0092 — OBD2 code P0092 flags a problem with the fuel delivery and mixture control (fuel pressure regulator 1 control circuit high). Short, gentle driving to a shop is usually possible. Common culprits: vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter, faulty fuel rail pressure sensor or wiring.
P0093 — P0093 — Fuel System Leak Detected - Large Leak. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel rail pressure sensor or wiring, clogged or leaking fuel injectors, weak fuel pump or clogged fuel filter.
P0094 — P0094 — Fuel System Leak Detected - Small Leak. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: weak fuel pump or clogged fuel filter, faulty fuel pressure regulator, contaminated or incorrect fuel.
P0095 — OBD2 code P0095 flags a problem with the throttle and intake air metering (intake air temperature sensor 2 circuit bank 1). Short, gentle driving to a shop is usually possible. Common culprits: failed electronic throttle motor, dirty throttle body or stuck throttle plate, contaminated or failed MAF/MAP sensor.
P0096 — Intake Air Temperature Sensor 2 Circuit Range/Performance Bank 1 (P0096): 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, contaminated or failed MAF/MAP sensor.
P0097 — P0097 — Intake Air Temperature Sensor 2 Circuit Low Bank 1. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor.
P0098 — OBD2 code P0098 flags a problem with the throttle and intake air metering (intake air temperature sensor 2 circuit high bank 1). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, dirty throttle body or stuck throttle plate, intake air leaks after the MAF sensor.