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

• P2100 — OBD2 code P2100 flags a problem with the throttle and intake air metering (throttle actuator "A" control motor circuit/open). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, wiring or connector faults in the throttle circuit, failed electronic throttle motor.
• P2104 — OBD2 code P2104 flags a problem with the throttle and intake air metering (throttle actuator control system - forced idle). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, faulty throttle position sensor or pedal sensor, intake air leaks after the MAF sensor.
• P2108 — P2108 — Throttle Actuator Control Module Performance. 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, contaminated or failed MAF/MAP sensor.
• P2109 — OBD2 code P2109 flags a problem with the throttle and intake air metering (throttle/pedal position sensor "A" minimum stop performance). Short, gentle driving to a shop is usually possible. Common culprits: failed electronic throttle motor, faulty throttle position sensor or pedal sensor, intake air leaks after the MAF sensor.
• P210A — OBD2 code P210A flags a problem with the throttle and intake air metering (throttle actuator "B" control motor circuit/open). Short, gentle driving to a shop is usually possible. Common culprits: faulty throttle position sensor or pedal sensor, wiring or connector faults in the throttle circuit, contaminated or failed MAF/MAP sensor.
• P210B — OBD2 code P210B flags a problem with the throttle and intake air metering (throttle actuator "B" control motor circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: faulty throttle position sensor or pedal sensor, contaminated or failed MAF/MAP sensor, wiring or connector faults in the throttle circuit.
• P210C — Throttle Actuator "B" Control Motor Circuit Low (P210C): 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 intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor, contaminated or failed MAF/MAP sensor.
• P210D — Throttle Actuator "B" Control Motor Circuit High (P210D): 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, contaminated or failed MAF/MAP sensor, intake air leaks after the MAF sensor.
• P210E — P210E — Throttle/Pedal Position Sensor/Switch "C"/"F" Voltage Correlation. 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, faulty throttle position sensor or pedal sensor.
• P2110 — Throttle Actuator Control System - Forced Limited RPM (P2110): 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 wiring or connector faults in the throttle circuit, contaminated or failed MAF/MAP sensor, failed electronic throttle motor.
• P2113 — P2113 — Throttle/Pedal Position Sensor "B" Minimum Stop 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, failed electronic throttle motor, dirty throttle body or stuck throttle plate.
• P2114 — OBD2 code P2114 flags a problem with the throttle and intake air metering (throttle/pedal position sensor "C" minimum stop performance). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, wiring or connector faults in the throttle circuit, faulty throttle position sensor or pedal sensor.
• P2115 — Throttle/Pedal Position Sensor "D" Minimum Stop Performance (P2115): 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 wiring or connector faults in the throttle circuit, dirty throttle body or stuck throttle plate, failed electronic throttle motor.
• P2116 — Throttle/Pedal Position Sensor "E" Minimum Stop Performance (P2116): 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, intake air leaks after the MAF sensor, dirty throttle body or stuck throttle plate.
• P2118 — Throttle Actuator Control Motor Current Range/Performance (P2118): 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, dirty throttle body or stuck throttle plate.
• P2119 — P2119 — Throttle Actuator Control Throttle Body 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, faulty throttle position sensor or pedal sensor, failed electronic throttle motor.
• P2120 — P2120 — Throttle/Pedal Position Sensor/Switch "D" 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, failed electronic throttle motor, contaminated or failed MAF/MAP sensor.
• P2121 — OBD2 code P2121 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch "D" circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, dirty throttle body or stuck throttle plate, contaminated or failed MAF/MAP sensor.
• P2122 — OBD2 code P2122 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch "D" circuit low). Short, gentle driving to a shop is usually possible. Common culprits: dirty throttle body or stuck throttle plate, contaminated or failed MAF/MAP sensor, faulty throttle position sensor or pedal sensor.
• P2123 — OBD2 code P2123 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch "D" circuit high). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, contaminated or failed MAF/MAP sensor, dirty throttle body or stuck throttle plate.
• P2124 — OBD2 code P2124 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch "D" circuit intermittent). Short, gentle driving to a shop is usually possible. Common culprits: wiring or connector faults in the throttle circuit, contaminated or failed MAF/MAP sensor, faulty throttle position sensor or pedal sensor.
• P2125 — P2125 — Throttle/Pedal Position Sensor/Switch "E" Circuit. 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.
• P2126 — OBD2 code P2126 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch "E" circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: failed electronic throttle motor, wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor.
• P2128 — OBD2 code P2128 flags a problem with the throttle and intake air metering (throttle/pedal position sensor/switch "E" circuit high). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, failed electronic throttle motor, dirty throttle body or stuck throttle plate.