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.

U0124 — Lost Communication With Lateral Acceleration Sensor Module (U0124): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by poor grounds or low battery voltage, water ingress in harness junctions, corroded connectors, especially in wet areas.
U0125 — U0125 — Lost Communication With Multi-axis Acceleration Sensor Module. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas, a faulty module pulling the bus down.
U0126 — U0126 — Lost Communication With Steering Angle Sensor Module. 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, damaged sensor wiring or corroded connector.
U0127 — OBD2 code U0127 flags a problem with the vehicle network (CAN bus) communication (lost communication with tire pressure monitor module). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, a faulty module pulling the bus down, water ingress in harness junctions.
U0128 — OBD2 code U0128 flags a problem with the ABS / stability control (lost communication with park brake control module). Short, gentle driving to a shop is usually possible. Common culprits: damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector, blown fuse or low voltage to the ABS module.
U0130 — OBD2 code U0130 flags a problem with the vehicle network (CAN bus) communication (lost communication with steering effort control module). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, water ingress in harness junctions, poor grounds or low battery voltage.
U0132 — U0132 — Lost Communication With Ride Level Control Module. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: aftermarket equipment interfering with the bus, water ingress in harness junctions, poor grounds or low battery voltage.
U0133 — OBD2 code U0133 flags a problem with the vehicle network (CAN bus) communication (lost communication with active roll control module). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, a faulty module pulling the bus down, water ingress in harness junctions.
U0134 — U0134 — Lost Communication With Power Steering Control Module Rear. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage, corroded connectors, especially in wet areas.
U0135 — OBD2 code U0135 flags a problem with the vehicle network (CAN bus) communication (lost communication with differential control module front). Short, gentle driving to a shop is usually possible. Common culprits: damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage, corroded connectors, especially in wet areas.
U0136 — Lost Communication With Differential Control Module Rear (U0136): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by water ingress in harness junctions, poor grounds or low battery voltage, corroded connectors, especially in wet areas.
U0137 — Lost Communication With Trailer Brake Control Module (U0137): a vehicle network fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.
U0138 — U0138 — Lost Communication With All Terrain Control Module. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.
U0139 — U0139 — Lost Communication With Suspension Control Module "B". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: poor grounds or low battery voltage, corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground.
U0141 — U0141 — Lost Communication With Body Control Module "A". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: poor grounds or low battery voltage, corroded connectors, especially in wet areas, a faulty module pulling the bus down.
U0142 — Lost Communication With Body Control Module "B" (U0142): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by corroded connectors, especially in wet areas, poor grounds or low battery voltage, a faulty module pulling the bus down.
U0143 — Lost Communication With Body Control Module "C" (U0143): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage, corroded connectors, especially in wet areas.
U0144 — Lost Communication With Body Control Module "D" (U0144): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by corroded connectors, especially in wet areas, aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground.
U0145 — Lost Communication With Body Control Module "E" (U0145): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by damaged CAN bus wiring or short to power/ground, water ingress in harness junctions, aftermarket equipment interfering with the bus.
U0147 — OBD2 code U0147 flags a problem with the vehicle network (CAN bus) communication (lost communication with gateway "B"). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, a faulty module pulling the bus down, water ingress in harness junctions.
U0148 — U0148 — Lost Communication With Gateway "C". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: poor grounds or low battery voltage, water ingress in harness junctions, corroded connectors, especially in wet areas.
U0149 — Lost Communication With Gateway "D" (U0149): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by aftermarket equipment interfering with the bus, a faulty module pulling the bus down, poor grounds or low battery voltage.
U0150 — Lost Communication With Gateway "E" (U0150): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by water ingress in harness junctions, a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground.
U0152 — Lost Communication With Side Restraints Control Module Left (U0152): a vehicle network fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by depleted backup battery or low system voltage, damaged wiring under seats or in the steering column, faulty impact or occupancy sensor.