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.

U044A — U044A — Invalid Data Received From Gateway "D". 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, a faulty module pulling the bus down, poor grounds or low battery voltage.
U0451 — U0451 — Invalid Data Received From Gateway "E". 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, aftermarket equipment interfering with the bus.
U0452 — U0452 — Invalid Data Received From Restraints Control Module. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: SRS control module fault or stored crash data, depleted backup battery or low system voltage, faulty impact or occupancy sensor.
U0453 — Invalid Data Received From Side Restraints Control Module Left (U0453): a vehicle network fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by failed clockspring (driver airbag circuit), faulty impact or occupancy sensor, damaged wiring under seats or in the steering column.
U0454 — Invalid Data Received From Side Restraints Control Module Right (U0454): a vehicle network fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by damaged wiring under seats or in the steering column, depleted backup battery or low system voltage, faulty impact or occupancy sensor.
U0456 — Invalid Data Received From Coolant Temperature Control Module (U0456): a vehicle network fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by water pump or radiator issues, wiring faults in the sensor circuit, thermostat stuck open or closed.
U0457 — Invalid Data Received From Information Center "A" (U0457): 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, damaged CAN bus wiring or short to power/ground.
U0458 — U0458 — Invalid Data Received From Information Center "B". 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, corroded connectors, especially in wet areas, a faulty module pulling the bus down.
U0459 — U0459 — Invalid Data Received From Head Up Display. 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.
U045A — OBD2 code U045A flags a problem with the vehicle network (CAN bus) communication (invalid data received from parking assist control module "A"). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, poor grounds or low battery voltage, water ingress in harness junctions.
U0460 — U0460 — U0460 - Invalid Data Received From Active Safety Control Module 23. 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, aftermarket equipment interfering with the bus.
U0461 — U0461 — Invalid Data Received From Audible Alert 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, a faulty module pulling the bus down.
U0462 — U0462 — Invalid Data Received From Compass 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, a faulty module pulling the bus down, water ingress in harness junctions.
U0463 — Invalid Data Received From Navigation Display Module (U0463): 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, damaged CAN bus wiring or short to power/ground, water ingress in harness junctions.
U0464 — OBD2 code U0464 flags a problem with the vehicle network (CAN bus) communication (invalid data received from navigation control module). Short, gentle driving to a shop is usually possible. Common culprits: water ingress in harness junctions, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.
U0465 — Invalid Data Received From PTO Control Module (U0465): 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, water ingress in harness junctions.
U0466 — U0466 — Invalid Data Received From HVAC 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, water ingress in harness junctions, poor grounds or low battery voltage.
U0467 — OBD2 code U0467 flags a problem with the vehicle network (CAN bus) communication (invalid data received from fuel additive control module). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, water ingress in harness junctions, a faulty module pulling the bus down.
U0468 — U0468 — Invalid Data Received From Fuel Cell Control Module. 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.
U0469 — OBD2 code U0469 flags a problem with the vehicle network (CAN bus) communication (invalid data received from starter / generator control module). 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, a faulty module pulling the bus down.
U046A — U046A — Invalid Data Received From Sunroof Control Module. 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, poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground.
U046B — OBD2 code U046B flags a problem with the vehicle network (CAN bus) communication (invalid data received from global positioning system module). Short, gentle driving to a shop is usually possible. Common culprits: damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas, water ingress in harness junctions.
U0470 — U0470 - Invalid Data Received From Active Safety Control Module 33 (U0470): a vehicle 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.
U0471 — OBD2 code U0471 flags a problem with the airbag / restraint system (SRS) (invalid data received from "restraints system sensor A"). Short, gentle driving to a shop is usually possible. Common culprits: depleted backup battery or low system voltage, damaged wiring under seats or in the steering column, failed clockspring (driver airbag circuit).