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.

U0513 — Invalid Data Received From Yaw Rate Sensor Module (U0513): a vehicle network 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, damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module.
U0516 — Invalid Data Received From "Door Switch A" (U0516): 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, poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground.
U0517 — U0517 — Invalid Data Received From "Door Switch B". 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, damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage.
U0518 — Invalid Data Received From "Door Switch C" (U0518): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by a faulty module pulling the bus down, water ingress in harness junctions, corroded connectors, especially in wet areas.
U0519 — Invalid Data Received From "Door Switch D" (U0519): 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, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.
U051A — U051A — Invalid Data Received From "Door Switch E". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: water ingress in harness junctions, aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground.
U0520 — U0520 - Invalid Data Received From Active Safety Control Module 83 (U0520): a vehicle 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, poor grounds or low battery voltage, water ingress in harness junctions.
U0521 — OBD2 code U0521 flags a problem with the vehicle network (CAN bus) communication (invalid data received from "door switch F"). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, water ingress in harness junctions, aftermarket equipment interfering with the bus.
U0522 — OBD2 code U0522 flags a problem with the vehicle network (CAN bus) communication (invalid data received from "door switch G"). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, a faulty module pulling the bus down, water ingress in harness junctions.
U0523 — Invalid Data Received From "Door Window Motor A" (U0523): 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, aftermarket equipment interfering with the bus, corroded connectors, especially in wet areas.
U0524 — U0524 — Invalid Data Received From "Door Window Motor B". 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, a faulty module pulling the bus down, water ingress in harness junctions.
U0525 — U0525 — Invalid Data Received From "Door Window Motor C". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: a faulty module pulling the bus down, aftermarket equipment interfering with the bus, corroded connectors, especially in wet areas.
U0526 — OBD2 code U0526 flags a problem with the vehicle network (CAN bus) communication (invalid data received from "door window motor D"). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground.
U0527 — OBD2 code U0527 flags a problem with the vehicle network (CAN bus) communication (invalid data received from "door window motor E"). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, aftermarket equipment interfering with the bus, water ingress in harness junctions.
U0528 — U0528 — Invalid Data Received From "Door Window Motor F". 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.
U0529 — Invalid Data Received From "Door Window Motor G" (U0529): 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.
U052A — U052A — Invalid Data Received From Heated Steering Wheel 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, aftermarket equipment interfering with the bus, a faulty module pulling the bus down.
U0530 — U0530 - Invalid Data Received From Active Safety Control Module 93 (U0530): a vehicle 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, water ingress in harness junctions, corroded connectors, especially in wet areas.
U0531 — Invalid Data Received From Rear Gate Module (U0531): 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, corroded connectors, especially in wet areas, poor grounds or low battery voltage.
U0532 — U0532 — Invalid Data Received From Rain Sensing Module. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: water ingress in harness junctions, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.
U0533 — U0533 — Invalid Data Received From Side Obstacle Detection Control Module Left. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.
U0534 — Invalid Data Received From Side Obstacle Detection Control Module Right (U0534): 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, aftermarket equipment interfering with the bus.
U0535 — OBD2 code U0535 flags a problem with the vehicle network (CAN bus) communication (invalid data received from convenience recall module). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, corroded connectors, especially in wet areas, poor grounds or low battery voltage.
U0536 — U0536 — Invalid Data Received From Lateral Acceleration Sensor 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, a faulty module pulling the bus down, corroded connectors, especially in wet areas.