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

• P0210 — OBD2 code P0210 flags a problem with the fuel delivery and mixture control (injector circuit malfunction - cylinder 10). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or incorrect fuel, weak fuel pump or clogged fuel filter, vacuum or intake leaks skewing the mixture.
• P0211 — P0211 — Injector Circuit Malfunction - Cylinder 11. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel pressure regulator, contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring.
• P0212 — Injector Circuit Malfunction - Cylinder 12 (P0212): 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, faulty fuel rail pressure sensor or wiring, contaminated or incorrect fuel.
• P0213 — OBD2 code P0213 flags a problem with the fuel delivery and mixture control (cold start injector 1 malfunction). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator, clogged or leaking fuel injectors.
• P0214 — OBD2 code P0214 flags a problem with the fuel delivery and mixture control (cold start injector 2 malfunction). Short, gentle driving to a shop is usually possible. Common culprits: vacuum or intake leaks skewing the mixture, faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter.
• P0215 — P0215 — Engine Shutoff Solenoid Malfunction. 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, blown fuse feeding the circuit, corroded, loose or damaged connector.
• P0216 — P0216 — Injection Timing Control Circuit 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, blown fuse feeding the circuit, poor ground connection.
• P0217 — Engine Overtemp Condition (P0217): 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, poor ground connection.
• P0218 — Transmission Over Temperature Condition (P0218): 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).
• P0219 — P0219 — Engine Overspeed Condition. 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.
• P021A — P021A — Cylinder 7 Injection Timing. 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, poor ground connection, control module driver fault.
• P021B — OBD2 code P021B flags a problem with the sensor and actuator circuits (cylinder 8 injection timing). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, control module driver fault, blown fuse feeding the circuit.
• P021C — P021C — Cylinder 9 Injection Timing. 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, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
• P021D — OBD2 code P021D flags a problem with the sensor and actuator circuits (cylinder 10 injection timing). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, poor ground connection.
• P021E — OBD2 code P021E flags a problem with the sensor and actuator circuits (cylinder 11 injection timing). 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, poor ground connection.
• P021F — P021F — Cylinder 12 Injection Timing. 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, control module driver fault, corroded, loose or damaged connector.
• P0220 — P0220 — Throttle/Pedal Position Sensor/Switch B Circuit Malfunction. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: failed electronic throttle motor, dirty throttle body or stuck throttle plate, contaminated or failed MAF/MAP sensor.
• P0221 — P0221 — Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance. 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, contaminated or failed MAF/MAP sensor, failed electronic throttle motor.
• P0222 — OBD2 code P0222 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch b circuit low input). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor, failed electronic throttle motor.
• P0223 — OBD2 code P0223 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch b circuit high input). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor, contaminated or failed MAF/MAP sensor.
• P0224 — P0224 — Throttle/Pedal Position Sensor/Switch B Circuit Intermittent. 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, dirty throttle body or stuck throttle plate.
• P0225 — P0225 — Throttle/Pedal Position Sensor/Switch C Circuit Malfunction. 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, wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor.
• P0226 — P0226 — Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: contaminated or failed MAF/MAP sensor, failed electronic throttle motor, intake air leaks after the MAF sensor.
• P0227 — P0227 — Throttle/Pedal Position Sensor/Switch C Circuit Low Input. 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, failed electronic throttle motor, dirty throttle body or stuck throttle plate.