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.

B2593 — Power Sliding Door Opened During Module Close Command (B2593): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by blown fuse or failed relay, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
B2594 — OBD2 code B2594 flags a problem with the body electrical system (no movement detected after an unlatch during power open). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, corroded or loose connectors, blown fuse or failed relay.
B2595 — Anti Theft Input Signal Circuit Failure (B2595): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by body control module (BCM) fault, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
B2596 — OBD2 code B2596 flags a problem with the body electrical system (headlamp aim output relay circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, blown fuse or failed relay, corroded or loose connectors.
B2597 — B2597 — Headlamp Aim Output Relay Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
B2598 — OBD2 code B2598 flags a problem with the body electrical system (headlamp relay circuit failure). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, body control module (BCM) fault, blown fuse or failed relay.
B2599 — Tailgate Release Open Circuit (B2599): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by damaged wiring in door jambs or wet areas, corroded or loose connectors, body control module (BCM) fault.
B2600 — OBD2 code B2600 flags a problem with the body electrical system (double locking door motor frozen). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
B2601 — B2601 — No Latch Signal Sensed on Closing and Door Reversed. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: damaged wiring in door jambs or wet areas, corroded or loose connectors, body control module (BCM) fault.
B2602 — Missing Latch Signal During Power Sliding Door Unlatch (B2602): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by damaged wiring in door jambs or wet areas, body control module (BCM) fault, corroded or loose connectors.
B2603 — PSD Not Fully Closed During Self-Test (B2603): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by blown fuse or failed relay, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
B2604 — B2604 — Power Sliding Door On/Off Switch Open Circuit. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: damaged wiring in door jambs or wet areas, body control module (BCM) fault, blown fuse or failed relay.
B2605 — B2605 — Disable Signal Open Circuit. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, blown fuse or failed relay, damaged wiring in door jambs or wet areas.
B2606 — B2606 — A/C Temperature Sensor Out of Range. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, blown fuse or failed relay, damaged wiring in door jambs or wet areas.
C0030 — OBD2 code C0030 flags a problem with the sensor and actuator circuits (C0030 — left front tone wheel (subfault): causes, symptoms & fix). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, control module driver fault.
C0031 — C0031 — C0031 — Left Front Wheel Speed Sensor (Subfault): Causes, Symptoms & Fix. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, blown fuse or low voltage to the ABS module, failed wheel speed sensor.
C0032 — OBD2 code C0032 flags a problem with the ABS / stability control (C0032 — left front wheel speed sensor supply (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.
C0033 — C0033 — Right Front Tone Wheel (Subfault): Causes, Symptoms & Fix (C0033): a vehicle 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, poor ground connection, faulty sensor or actuator of the affected circuit.
C0034 — OBD2 code C0034 flags a problem with the ABS / stability control (C0034 — right front wheel speed sensor (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: damaged sensor wiring or corroded connector, damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module.
C0035 — C0035 — Right Front Wheel Speed Sensor Supply (Subfault): Causes, Symptoms & Fix (C0035): a vehicle fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by blown fuse or low voltage to the ABS module, faulty ABS module or pump motor, damaged sensor wiring or corroded connector.
C0036 — C0036 — C0036 — Left Rear Tone Wheel (Subfault): Causes, Symptoms & Fix. 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, poor ground connection.
C0037 — C0037 — Left Rear Wheel Speed Sensor (Subfault): Causes, Symptoms & Fix (C0037): a vehicle 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, faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub.
C0038 — OBD2 code C0038 flags a problem with the ABS / stability control (C0038 — left rear wheel speed sensor supply (subfault): causes, symptoms & fix). 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.
C0039 — C0039 — C0039 — Right Rear Tone Wheel (Subfault): Causes, Symptoms & Fix. 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, open or shorted wiring in the circuit, poor ground connection.