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

• P2129 — Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent (P2129): 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, intake air leaks after the MAF sensor, failed electronic throttle motor.
• P212A — P212A — Throttle Position Sensor/Switch "G" Circuit. 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, contaminated or failed MAF/MAP sensor.
• P212B — P212B — Throttle Position Sensor/Switch "G" 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, wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor.
• P212C — Throttle Position Sensor/Switch "G" Circuit Low (P212C): 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, failed electronic throttle motor, contaminated or failed MAF/MAP sensor.
• P212D — P212D — Throttle Position Sensor/Switch "G" Circuit High. 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, dirty throttle body or stuck throttle plate, faulty throttle position sensor or pedal sensor.
• P212E — OBD2 code P212E flags a problem with the throttle and intake air metering (throttle position sensor/switch "G" circuit intermittent). Short, gentle driving to a shop is usually possible. Common culprits: dirty throttle body or stuck throttle plate, faulty throttle position sensor or pedal sensor, wiring or connector faults in the throttle circuit.
• P2130 — P2130 — Throttle/Pedal Position Sensor/Switch "F" Circuit. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: failed electronic throttle motor, wiring or connector faults in the throttle circuit, faulty throttle position sensor or pedal sensor.
• P2131 — P2131 — Throttle/Pedal Position Sensor/Switch "F" 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, dirty throttle body or stuck throttle plate.
• P2132 — P2132 — Throttle/Pedal Position Sensor/Switch "F" Circuit Low. 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, dirty throttle body or stuck throttle plate.
• P2137 — Throttle/Pedal Pos Sensor/Switch B / C Voltage Correlation (P2137): 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, intake air leaks after the MAF sensor.
• P2139 — P2139 — Throttle/Pedal Pos Sensor/Switch D / F Voltage Correlation. 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.
• P213A — OBD2 code P213A flags a problem with the exhaust gas recirculation (EGR) system (exhaust gas recirculation throttle control circuit "B" /open). The car is usually drivable while you plan the repair. Common culprits: carbon buildup blocking the EGR valve or passages, vacuum leaks in EGR control lines, failed EGR valve or position sensor.
• P213B — P213B — Exhaust Gas Recirculation Throttle Control Circuit "B" Range/Performance. A fault in the exhaust gas recirculation (EGR) system. The car is usually drivable while you plan the repair. Typical causes: carbon buildup blocking the EGR valve or passages, vacuum leaks in EGR control lines, faulty EGR solenoid or wiring.
• P213C — OBD2 code P213C flags a problem with the exhaust gas recirculation (EGR) system (exhaust gas recirculation throttle control circuit "B" low). The car is usually drivable while you plan the repair. Common culprits: ECM control circuit fault, vacuum leaks in EGR control lines, carbon buildup blocking the EGR valve or passages.
• P213D — P213D — Exhaust Gas Recirculation Throttle Control Circuit "B" High. A fault in the exhaust gas recirculation (EGR) system. The car is usually drivable while you plan the repair. Typical causes: failed EGR valve or position sensor, ECM control circuit fault, carbon buildup blocking the EGR valve or passages.
• P213E — P213E — Fuel Injection System Fault - Forced Engine Shutdown. 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, control module driver fault, corroded, loose or damaged connector.
• P2140 — Throttle/Pedal Pos Sensor/Switch E / F Voltage Correlation (P2140): 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 contaminated or failed MAF/MAP sensor, wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor.
• P2141 — Exhaust Gas Recirculation Throttle Control Circuit "A" Low (P2141): a powertrain (engine/transmission) fault affecting the exhaust gas recirculation (EGR) system. The car is usually drivable while you plan the repair. Most often caused by failed EGR valve or position sensor, ECM control circuit fault, faulty EGR solenoid or wiring.
• P2142 — P2142 — Exhaust Gas Recirculation Throttle Control Circuit "A" High. A fault in the exhaust gas recirculation (EGR) system. The car is usually drivable while you plan the repair. Typical causes: failed EGR valve or position sensor, faulty EGR solenoid or wiring, carbon buildup blocking the EGR valve or passages.
• P2143 — Exhaust Gas Recirculation Vent Control Circuit/Open (P2143): a powertrain (engine/transmission) fault affecting the exhaust gas recirculation (EGR) system. The car is usually drivable while you plan the repair. Most often caused by carbon buildup blocking the EGR valve or passages, ECM control circuit fault, faulty EGR solenoid or wiring.
• P2144 — OBD2 code P2144 flags a problem with the exhaust gas recirculation (EGR) system (exhaust gas recirculation vent control circuit low). The car is usually drivable while you plan the repair. Common culprits: faulty EGR solenoid or wiring, vacuum leaks in EGR control lines, ECM control circuit fault.
• P2145 — P2145 — Exhaust Gas Recirculation Vent Control Circuit High. A fault in the exhaust gas recirculation (EGR) system. The car is usually drivable while you plan the repair. Typical causes: faulty EGR solenoid or wiring, failed EGR valve or position sensor, vacuum leaks in EGR control lines.
• P2146 — P2146 — Fuel Injector Group "A" Supply Voltage Circuit/Open. 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, vacuum or intake leaks skewing the mixture.
• P2148 — P2148 — Fuel Injector Group "A" Supply Voltage Circuit High. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel pressure regulator, weak fuel pump or clogged fuel filter, faulty fuel rail pressure sensor or wiring.