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.

P1210 — P1210 — Injector Circuit Open / Shorted - Cylinder #3. 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, faulty fuel pressure regulator.
P1211 — Injector Circuit Open / Shorted - Cylinder #4 (P1211): 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, contaminated or incorrect fuel, faulty fuel pressure regulator.
P1212 — P1212 — Injector Circuit Open / Shorted - Cylinder #5. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator.
P1213 — OBD2 code P1213 flags a problem with the fuel delivery and mixture control (injector circuit open / shorted - cylinder #6). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter.
P1214 — P1214 — Injector Control Pressure System Fault. 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.
P1215 — OBD2 code P1215 flags a problem with the fuel delivery and mixture control (injector control pressure above expected level). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or incorrect fuel, clogged or leaking fuel injectors, faulty fuel pressure regulator.
P1216 — P1216 — Injector Control Pressure Sensor Above / Below Desired. 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, contaminated or incorrect fuel.
P1217 — OBD2 code P1217 flags a problem with the fuel delivery and mixture control (injector control pressure not detected during crank). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, clogged or leaking fuel injectors, contaminated or incorrect fuel.
P1218 — OBD2 code P1218 flags a problem with the fuel delivery and mixture control (start injector circuit malfunction). Short, gentle driving to a shop is usually possible. Common culprits: vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter, faulty fuel rail pressure sensor or wiring.
P1219 — OBD2 code P1219 flags a problem with the sensor and actuator circuits (pedal position sensor b circuit intermittent). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, corroded, loose or damaged connector, open or shorted wiring in the circuit.
P1220 — OBD2 code P1220 flags a problem with the sensor and actuator circuits (pedal position sensor c circuit low input). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, blown fuse feeding the circuit, control module driver fault.
P1221 — P1221 — Pedal Position Sensor C Circuit High Input. 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, corroded, loose or damaged connector, open or shorted wiring in the circuit.
P1222 — OBD2 code P1222 flags a problem with the sensor and actuator circuits (pedal position sensor c circuit intermittent). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit, poor ground connection.
P1224 — CID Low (P1224): 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, corroded, loose or damaged connector, open or shorted wiring in the circuit.
P1225 — Series Throttle Control System Malfunction (P1225): 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 dirty throttle body or stuck throttle plate, failed electronic throttle motor, contaminated or failed MAF/MAP sensor.
P1226 — P1226 — Traction Control System Malfunction. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector, failed wheel speed sensor.
P1227 — Traction Control Output Circuit Malfunction (P1227): 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, blown fuse or low voltage to the ABS module, faulty ABS module or pump motor.
P1228 — Pedal Demand Sensor B Circuit High Input (P1228): 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 open or shorted wiring in the circuit, control module driver fault, faulty sensor or actuator of the affected circuit.
P1229 — P1229 — Throttle Position Sensor B Out Of Self Test Range. 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, dirty throttle body or stuck throttle plate.
P1233 — P1233 — Wastegate Failed Open (Under Pressure). A fault in the turbocharger / supercharger boost control. Short, gentle driving to a shop is usually possible. Typical causes: stuck wastegate or faulty boost control solenoid, boost leak in intercooler piping or hoses, worn turbocharger.
P1235 — Fuel Pump Low Speed Malfunction (P1235): 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 pressure regulator, vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors.
P1236 — Fuel Pump Secondary Circuit Low (P1236): 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, weak fuel pump or clogged fuel filter.
P1238 — Fuel Pump Driver Module Off Line (P1238): 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 contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator.
P1239 — OBD2 code P1239 flags a problem with the fuel delivery and mixture control (fuel pump driver module off line). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors.