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.

P2149 — P2149 — Fuel Injector Group "B" 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, contaminated or incorrect fuel, clogged or leaking fuel injectors.
P2150 — OBD2 code P2150 flags a problem with the fuel delivery and mixture control (fuel injector group "B" supply voltage circuit low). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring, vacuum or intake leaks skewing the mixture.
P2152 — P2152 — Fuel Injector Group "C" 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 pressure regulator, vacuum or intake leaks skewing the mixture, contaminated or incorrect fuel.
P2153 — OBD2 code P2153 flags a problem with the fuel delivery and mixture control (fuel injector group "C" supply voltage circuit low). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or incorrect fuel, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
P2154 — P2154 — Fuel Injector Group "C" 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 rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, contaminated or incorrect fuel.
P2155 — OBD2 code P2155 flags a problem with the fuel delivery and mixture control (fuel injector group "D" supply voltage circuit/open). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
P2156 — OBD2 code P2156 flags a problem with the fuel delivery and mixture control (fuel injector group "D" supply voltage circuit low). 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.
P2157 — Fuel Injector Group "D" Supply Voltage Circuit High (P2157): 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 faulty fuel rail pressure sensor or wiring, clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture.
P2158 — P2158 — Vehicle Speed Sensor "B". A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.
P2159 — P2159 — Vehicle Speed Sensor "B" Range/Performance. 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, blown fuse feeding the circuit.
P215A — Vehicle Speed - Wheel Speed Correlation (P215A): a powertrain (engine/transmission) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged sensor wiring or corroded connector, failed wheel speed sensor, blown fuse or low voltage to the ABS module.
P215B — P215B — Vehicle Speed - Output Shaft Speed Correlation. 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, poor ground connection.
P215C — OBD2 code P215C flags a problem with the ABS / stability control (output shaft speed - wheel speed correlation). Short, gentle driving to a shop is usually possible. Common culprits: failed wheel speed sensor, blown fuse or low voltage to the ABS module, damaged tone (reluctor) ring on the hub.
P2160 — Vehicle Speed Sensor "B" Circuit Low (P2160): 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 corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
P2161 — P2161 — Vehicle Speed Sensor "B" Intermittent/Erratic/High. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
P2163 — P2163 — Throttle/Pedal Position Sensor "A" Maximum Stop 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, contaminated or failed MAF/MAP sensor, intake air leaks after the MAF sensor.
P2164 — Throttle/Pedal Position Sensor "B" Maximum Stop Performance (P2164): 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.
P2165 — OBD2 code P2165 flags a problem with the throttle and intake air metering (throttle/pedal position sensor "C" maximum stop performance). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, failed electronic throttle motor, faulty throttle position sensor or pedal sensor.
P2166 — Throttle/Pedal Position Sensor "D" Maximum Stop Performance (P2166): 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, failed electronic throttle motor, faulty throttle position sensor or pedal sensor.
P2168 — OBD2 code P2168 flags a problem with the throttle and intake air metering (throttle/pedal position sensor "F" maximum stop performance). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, contaminated or failed MAF/MAP sensor, wiring or connector faults in the throttle circuit.
P2169 — OBD2 code P2169 flags a problem with the sensor and actuator circuits (exhaust pressure regulator vent solenoid control circuit/open). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, control module driver fault, poor ground connection.
P216A — P216A — Fuel Injector Group "E" 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 pressure regulator, vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter.
P216B — P216B — Fuel Injector Group "E" Supply Voltage Circuit Low. 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.
P216C — P216C — Fuel Injector Group "E" Supply Voltage Circuit High. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator, contaminated or incorrect fuel.