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.

U3053 — U3053 - Module Calibration Incomplete (U3053): a vehicle 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.
U3054 — OBD2 code U3054 flags a problem with the vehicle network (CAN bus) communication (U3054 - module calibration failure). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, water ingress in harness junctions, aftermarket equipment interfering with the bus.
U3055 — U3055 — U3055 - Module Initialization Error. 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, water ingress in harness junctions, aftermarket equipment interfering with the bus.
U3056 — OBD2 code U3056 flags a problem with the vehicle network (CAN bus) communication (U3056 - module initialization incomplete). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, poor grounds or low battery voltage, a faulty module pulling the bus down.
U3057 — U3057 - Module Initialization Failure (U3057): 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, corroded connectors, especially in wet areas.
U3058 — U3058 — U3058 - Module Self-Test Failure. 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.
U3059 — U3059 - Module Internal Performance (U3059): a vehicle 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.
U3060 — OBD2 code U3060 flags a problem with the vehicle network (CAN bus) communication (U3060 - module internal fault). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, poor grounds or low battery voltage, a faulty module pulling the bus down.
U3061 — U3061 - Module Internal Memory Error (U3061): a vehicle 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, a faulty module pulling the bus down.
U3062 — U3062 — U3062 - Module Internal Processor Error. 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, a faulty module pulling the bus down.
U3063 — U3063 — U3063 - Module Internal Clock Error. 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, corroded connectors, especially in wet areas.
U3064 — U3064 - Module Internal Watchdog Error (U3064): a vehicle 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, damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas.
U3065 — OBD2 code U3065 flags a problem with the vehicle network (CAN bus) communication (U3065 - module internal A/D converter error). Short, gentle driving to a shop is usually possible. Common culprits: water ingress in harness junctions, poor grounds or low battery voltage, a faulty module pulling the bus down.
U3066 — OBD2 code U3066 flags a problem with the vehicle network (CAN bus) communication (U3066 - module internal D/A converter error). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.
U3067 — U3067 — U3067 - Module Internal Communication Error. 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.
U3068 — U3068 - Module Internal Bus Error (U3068): 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, corroded connectors, especially in wet areas.
U3069 — U3069 — U3069 - Module Internal Timer Error. 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, aftermarket equipment interfering with the bus, a faulty module pulling the bus down.
U3070 — U3070 - Module Internal Sensor Error (U3070): 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, a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground.
U3071 — OBD2 code U3071 flags a problem with the vehicle network (CAN bus) communication (U3071 - module internal actuator error). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, corroded connectors, especially in wet areas, poor grounds or low battery voltage.
U3072 — U3072 - Module Internal Relay Error (U3072): a vehicle 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, poor grounds or low battery voltage.
U3073 — U3073 - Module Internal Switch Error (U3073): a vehicle 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, a faulty module pulling the bus down, corroded connectors, especially in wet areas.
U3074 — U3074 - Module Internal LED Error (U3074): a vehicle 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, aftermarket equipment interfering with the bus, poor grounds or low battery voltage.
U3075 — U3075 — U3075 - Module Internal Display Error. 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.
U3076 — U3076 — U3076 - Module Internal Communication Timeout. 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, poor grounds or low battery voltage, a faulty module pulling the bus down.