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.

P2269 — P2269 — Water in Fuel Condition. 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.
P226A — Water in Fuel Lamp Control Circuit (P226A): 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, blown fuse feeding the circuit, corroded, loose or damaged connector.
P226B — OBD2 code P226B flags a problem with the turbocharger / supercharger boost control (turbocharger/supercharger boost pressure too high - mechanical). Short, gentle driving to a shop is usually possible. Common culprits: clogged intake or exhaust (DPF/cat), worn turbocharger, vacuum or actuator line damage.
P2274 — O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 3 (P2274): a powertrain (engine/transmission) fault affecting the oxygen sensor circuit. The car is usually drivable while you plan the repair. Most often caused by damaged sensor wiring or connector, blown sensor heater fuse, oil or coolant contamination of the sensor tip.
P2275 — O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 3 (P2275): a powertrain (engine/transmission) fault affecting the oxygen sensor circuit. The car is usually drivable while you plan the repair. Most often caused by ECM signal circuit fault, blown sensor heater fuse, oil or coolant contamination of the sensor tip.
P2276 — OBD2 code P2276 flags a problem with the oxygen sensor circuit (O2 sensor signal biased/stuck lean bank 2 sensor 3). The car is usually drivable while you plan the repair. Common culprits: blown sensor heater fuse, aged or contaminated oxygen sensor, damaged sensor wiring or connector.
P2277 — O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 3 (P2277): a powertrain (engine/transmission) fault affecting the oxygen sensor circuit. The car is usually drivable while you plan the repair. Most often caused by ECM signal circuit fault, blown sensor heater fuse, oil or coolant contamination of the sensor tip.
P2278 — O2 Sensor Signals Swapped Bank 1 Sensor 3/Bank 2 Sensor 3 (P2278): a powertrain (engine/transmission) fault affecting the oxygen sensor circuit. The car is usually drivable while you plan the repair. Most often caused by ECM signal circuit fault, exhaust leak near the sensor, oil or coolant contamination of the sensor tip.
P2279 — Intake Air System Leak (P2279): 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, wiring or connector faults in the throttle circuit, dirty throttle body or stuck throttle plate.
P2280 — P2280 — Air Flow Restriction/Air Leak Between Air Filter and MAF. 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, dirty throttle body or stuck throttle plate.
P2281 — Air Leak Between MAF and Throttle Body (P2281): 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, wiring or connector faults in the throttle circuit, contaminated or failed MAF/MAP sensor.
P2282 — OBD2 code P2282 flags a problem with the throttle and intake air metering (air leak between throttle body and intake valves). 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.
P2283 — Injector Control Pressure Sensor Circuit (P2283): 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, vacuum or intake leaks skewing the mixture.
P2284 — P2284 — Injector Control Pressure Sensor Circuit Range/Performance. 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, faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator.
P2285 — Injector Control Pressure Sensor Circuit Low (P2285): 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, weak fuel pump or clogged fuel filter.
P2286 — Injector Control Pressure Sensor Circuit High (P2286): 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, faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator.
P2288 — P2288 — Injector Control Pressure Too High. 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, vacuum or intake leaks skewing the mixture, contaminated or incorrect fuel.
P2289 — Injector Control Pressure Too High - Engine Off (P2289): 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 vacuum or intake leaks skewing the mixture, faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter.
P228A — OBD2 code P228A flags a problem with the fuel delivery and mixture control (fuel pressure regulator 1 - forced engine shutdown). Short, gentle driving to a shop is usually possible. Common culprits: weak fuel pump or clogged fuel filter, vacuum or intake leaks skewing the mixture, contaminated or incorrect fuel.
P228C — P228C — Fuel Pressure Regulator 1 Exceeded Control Limits - Pressure Too 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, faulty fuel rail pressure sensor or wiring, vacuum or intake leaks skewing the mixture.
P228D — Fuel Pressure Regulator 1 Exceeded Control Limits - Pressure Too High (P228D): 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, clogged or leaking fuel injectors, faulty fuel rail pressure sensor or wiring.
P228E — Fuel Pressure Regulator 1 Exceeded Learning Limits - Too Low (P228E): 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, vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors.
P228F — P228F — Fuel Pressure Regulator 1 Exceeded Learning Limits - Too 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, faulty fuel pressure regulator, weak fuel pump or clogged fuel filter.
P2291 — OBD2 code P2291 flags a problem with the fuel delivery and mixture control (injector control pressure too low - engine cranking). 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.