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

• U0472 — OBD2 code U0472 flags a problem with the airbag / restraint system (SRS) (invalid data received from "restraints system sensor B"). Short, gentle driving to a shop is usually possible. Common culprits: damaged wiring under seats or in the steering column, depleted backup battery or low system voltage, SRS control module fault or stored crash data.
• U0473 — U0473 — Invalid Data Received From "Restraints System Sensor C". A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: damaged wiring under seats or in the steering column, SRS control module fault or stored crash data, faulty impact or occupancy sensor.
• U0474 — Invalid Data Received From "Restraints System Sensor D" (U0474): 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), depleted backup battery or low system voltage, faulty impact or occupancy sensor.
• U0475 — Invalid Data Received From "Restraints System Sensor E" (U0475): a vehicle network fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by SRS control module fault or stored crash data, depleted backup battery or low system voltage, damaged wiring under seats or in the steering column.
• U0476 — Invalid Data Received From "Restraints System Sensor F" (U0476): 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), depleted backup battery or low system voltage, SRS control module fault or stored crash data.
• U0478 — U0478 — Invalid Data Received From "Restraints System Sensor H". 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, faulty impact or occupancy sensor, failed clockspring (driver airbag circuit).
• U0479 — Invalid Data Received From "Restraints System Sensor I" (U0479): 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, failed clockspring (driver airbag circuit).
• U047A — Invalid Data Received From "Restraints System Sensor J" (U047A): 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, failed clockspring (driver airbag circuit), SRS control module fault or stored crash data.
• U047B — U047B — Invalid Data Received From "Restraints System Sensor K". A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: damaged wiring under seats or in the steering column, SRS control module fault or stored crash data, depleted backup battery or low system voltage.
• U047C — OBD2 code U047C flags a problem with the airbag / restraint system (SRS) (invalid data received from "restraints system sensor L"). 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, SRS control module fault or stored crash data.
• U047D — OBD2 code U047D flags a problem with the airbag / restraint system (SRS) (invalid data received from "restraints system sensor M"). Short, gentle driving to a shop is usually possible. Common culprits: failed clockspring (driver airbag circuit), depleted backup battery or low system voltage, damaged wiring under seats or in the steering column.
• U047E — Invalid Data Received From "Restraints System Sensor N" (U047E): 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, failed clockspring (driver airbag circuit).
• U047F — Invalid Data Received From Seatbelt Pretensioner Module "A" (U047F): a vehicle network fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by faulty impact or occupancy sensor, SRS control module fault or stored crash data, damaged wiring under seats or in the steering column.
• U0480 — Invalid Data Received From Seatbelt Pretensioner Module "B" (U0480): a vehicle network fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by faulty impact or occupancy sensor, SRS control module fault or stored crash data, damaged wiring under seats or in the steering column.
• U0481 — Invalid Data Received From Automatic Lighting Control Module (U0481): 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, water ingress in harness junctions, a faulty module pulling the bus down.
• U0482 — U0482 — Invalid Data Received From Headlamp Leveling Control 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, poor grounds or low battery voltage.
• U0483 — Invalid Data Received From Lighting Control Module Front (U0483): 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.
• U0484 — U0484 — Invalid Data Received From Lighting Control Module Rear "A". 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.
• U0485 — OBD2 code U0485 flags a problem with the vehicle network (CAN bus) communication (invalid data received from radio). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas.
• U0486 — OBD2 code U0486 flags a problem with the vehicle network (CAN bus) communication (invalid data received from antenna control module). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, a faulty module pulling the bus down, water ingress in harness junctions.
• U0487 — Invalid Data Received From Audio Amplifier "A" (U0487): 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, corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground.
• U0488 — Invalid Data Received From Digital Disc Player/Changer Module "A" (U0488): 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.
• U0489 — OBD2 code U0489 flags a problem with the vehicle network (CAN bus) communication (invalid data received from digital disc player/changer module "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.
• U048A — U048A — Invalid Data Received From Digital Disc Player/Changer Module "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, damaged CAN bus wiring or short to power/ground.