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.

• Engine misfire
• Engine overheating
• Rough idle
• Check engine light
• Poor fuel economy
• Hard starting
• Engine stalling
• Catalytic converter efficiency
• Oxygen sensor fault
• EVAP leak
• Thermostat not reaching temperature
• Lean air-fuel mixture
• Rich air-fuel mixture
• EGR flow fault
• Engine knock
• Charging system
• Throttle position
• Mass airflow sensor
• Turbo underboost
• Coolant temperature sensor
• Transmission fault

• B1200 — B1200 — Climate Control Pushbutton Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1201 — B1201 — Fuel Sender Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: faulty switch, motor or actuator of the affected system, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1202 — OBD2 code B1202 flags a problem with the body electrical system (fuel sender circuit open). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1203 — OBD2 code B1203 flags a problem with the body electrical system (fuel sender 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, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1204 — Fuel Sender Circuit Short To Ground (B1204): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by faulty switch, motor or actuator of the affected system, body control module (BCM) fault, corroded or loose connectors.
• B1205 — EIC Switch-1 Assembly Circuit Failure (B1205): 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, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1206 — OBD2 code B1206 flags a problem with the body electrical system (EIC switch-1 assembly circuit open). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1207 — B1207 — EIC Switch-1 Assembly Circuit Short To Battery. 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.
• B1208 — EIC Switch-1 Assembly Circuit Short To Ground (B1208): 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, blown fuse or failed relay.
• B1209 — B1209 — EIC Switch-2 Assembly Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B1210 — B1210 — EIC Switch-2 Assembly Circuit Open. 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.
• B1211 — B1211 — EIC Switch-2 Assembly Circuit Short To Battery. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.
• B1212 — OBD2 code B1212 flags a problem with the body electrical system (EIC switch-2 assembly circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, damaged wiring in door jambs or wet areas, body control module (BCM) fault.
• B1213 — OBD2 code B1213 flags a problem with the body electrical system (anti-theft number of programmed keys is below minimum). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1214 — OBD2 code B1214 flags a problem with the body electrical system (running board lamp circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1215 — OBD2 code B1215 flags a problem with the body electrical system (running board lamp 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.
• B1216 — Emergency & Road Side Assistance Switch Circuit Short to Ground (B1216): 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, faulty switch, motor or actuator of the affected system, corroded or loose connectors.
• B1217 — B1217 — Horn Relay Coil Circuit Failure. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, moisture or oil in the spark plug wells, failed ignition coil or coil pack.
• B1218 — OBD2 code B1218 flags a problem with the ignition system (horn relay coil circuit short to vbatt). Short, gentle driving to a shop is usually possible. Common culprits: failed ignition coil or coil pack, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.
• B1219 — Fuel Tank Pressure Sensor Circuit Failure (B1219): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by corroded or loose connectors, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1220 — B1220 — Fuel Tank Pressure Sensor Circuit Open. 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, blown fuse or failed relay, body control module (BCM) fault.
• B1221 — B1221 — B1221 — See Manufacturer: Causes, Symptoms & Fix. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1222 — OBD2 code B1222 flags a problem with the body electrical system (fuel temperature sensor #1 circuit failure). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, corroded or loose connectors, body control module (BCM) fault.
• B1223 — Fuel Temperature Sensor #1 Circuit Open (B1223): 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.