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.

P1513 — P1513 — Idle Control System Circuit Open. 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, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
P1514 — Idle Control System Circuit Shorted (P1514): 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 control module driver fault, poor ground connection, open or shorted wiring in the circuit.
P1515 — Idle Signal Circuit Malfunction (P1515): 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
P1516 — OBD2 code P1516 flags a problem with the throttle and intake air metering (idle switch (electric control throttle) circuit malfunction). Short, gentle driving to a shop is usually possible. Common culprits: failed electronic throttle motor, dirty throttle body or stuck throttle plate, faulty throttle position sensor or pedal sensor.
P1517 — P1517 — Intake Manifold Runner Control (Bank 1) Stuck Closed. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
P1518 — P1518 — Intake Manifold Runner Control (Bank 2) Stuck Closed. 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, poor ground connection, blown fuse feeding the circuit.
P1519 — P1519 — High Load Neutral/Drive Fault. 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, blown fuse feeding the circuit, control module driver fault.
P1520 — P1520 — Electric Current Circuit Malfunction. 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, poor ground connection.
P1521 — OBD2 code P1521 flags a problem with the sensor and actuator circuits (IMRC input error (bank 1)). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
P1523 — Intake Manifold Runner Control (Stuck Open) (P1523): 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, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
P1525 — P1525 — Intake Manifold Runner Control Circuit Malfunction. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, blown fuse feeding the circuit, open or shorted wiring in the circuit.
P1526 — P1526 — Variable Intake Solenoid #1 Circuit Malfunction. 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, faulty sensor or actuator of the affected circuit, control module driver fault.
P1527 — Variable Intake Solenoid #2 Circuit Malfunction (P1527): 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 faulty sensor or actuator of the affected circuit, control module driver fault, poor ground connection.
P1528 — OBD2 code P1528 flags a problem with the sensor and actuator circuits (IVC solenoid circuit malfunction). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, control module driver fault, blown fuse feeding the circuit.
P1529 — Variable Intake Solenoid System (P1529): 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, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
P1530 — Air Bypass Valve System (P1530): 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, corroded, loose or damaged connector, blown fuse feeding the circuit.
P1531 — Air Bypass System (P1531): 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, open or shorted wiring in the circuit, corroded, loose or damaged connector.
P1532 — Accelerate Warmup Solenoid Circuit Malfunction (P1532): 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 faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, poor ground connection.
P1533 — Subsidiary Throttle Valve Solenoid Circuit Malfunction (P1533): 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, contaminated or failed MAF/MAP sensor, intake air leaks after the MAF sensor.
P1534 — SCAIR Solenoid Circuit Malfunction (P1534): 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, control module driver fault.
P1535 — OBD2 code P1535 flags a problem with the sensor and actuator circuits (A/C clutch circuit malfunction). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, control module driver fault.
P1536 — P1536 — Invalid Test - Accelerator Pedal Movement. 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, intake air leaks after the MAF sensor, contaminated or failed MAF/MAP sensor.
P1537 — IMCC Circuit Malfunction (P1537): 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 blown fuse feeding the circuit, control module driver fault, open or shorted wiring in the circuit.
P1538 — AAI Circuit Malfunction (P1538): 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 control module driver fault, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.