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

• U0343 — OBD2 code U0343 flags a problem with the vehicle network (CAN bus) communication (U0343 - lost communication with active safety control module 31). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, water ingress in harness junctions, a faulty module pulling the bus down.
• U0344 — U0344 — U0344 - Lost Communication With Active Safety Control Module 32. 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, a faulty module pulling the bus down.
• U0345 — U0345 — U0345 - Lost Communication With Active Safety Control Module 33. 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, poor grounds or low battery voltage, water ingress in harness junctions.
• U0346 — OBD2 code U0346 flags a problem with the vehicle network (CAN bus) communication (U0346 - lost communication with active safety control module 34). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas.
• U0347 — U0347 - Lost Communication With Active Safety Control Module 35 (U0347): 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.
• U0348 — U0348 — U0348 - Lost Communication With Active Safety Control Module 36. 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, corroded connectors, especially in wet areas, water ingress in harness junctions.
• U0349 — OBD2 code U0349 flags a problem with the vehicle network (CAN bus) communication (U0349 - lost communication with active safety control module 37). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground.
• U0350 — U0350 — U0350 - Lost Communication With Active Safety Control Module 38. 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, poor grounds or low battery voltage.
• U0351 — OBD2 code U0351 flags a problem with the vehicle network (CAN bus) communication (U0351 - software incompatibility with active safety control module 1). Short, gentle driving to a shop is usually possible. Common culprits: damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down, poor grounds or low battery voltage.
• U0352 — U0352 - Software Incompatibility With Active Safety Control Module 2 (U0352): 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, poor grounds or low battery voltage.
• U0353 — U0353 - Software Incompatibility With Active Safety Control Module 3 (U0353): 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.
• U0354 — U0354 - Software Incompatibility With Active Safety Control Module 4 (U0354): 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, a faulty module pulling the bus down.
• U0355 — OBD2 code U0355 flags a problem with the vehicle network (CAN bus) communication (U0355 - software incompatibility with active safety control module 5). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground.
• U0356 — OBD2 code U0356 flags a problem with the vehicle network (CAN bus) communication (U0356 - software incompatibility with active safety control module 6). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, water ingress in harness junctions, aftermarket equipment interfering with the bus.
• U0357 — U0357 — U0357 - Software Incompatibility With Active Safety Control Module 7. 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, water ingress in harness junctions.
• U0358 — U0358 - Software Incompatibility With Active Safety Control Module 8 (U0358): 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, water ingress in harness junctions, aftermarket equipment interfering with the bus.
• U0359 — U0359 - Software Incompatibility With Active Safety Control Module 9 (U0359): a vehicle 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, poor grounds or low battery voltage.
• U0360 — U0360 — U0360 - Software Incompatibility With Active Safety Control Module 10. 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.
• U0361 — U0361 - Software Incompatibility With Active Safety Control Module 11 (U0361): 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, water ingress in harness junctions, a faulty module pulling the bus down.
• U0362 — OBD2 code U0362 flags a problem with the vehicle network (CAN bus) communication (U0362 - software incompatibility with active safety control module 12). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground.
• U0363 — U0363 — U0363 - Software Incompatibility With Active Safety Control Module 13. 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, aftermarket equipment interfering with the bus.
• U0364 — OBD2 code U0364 flags a problem with the vehicle network (CAN bus) communication (U0364 - software incompatibility with active safety control module 14). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, aftermarket equipment interfering with the bus, corroded connectors, especially in wet areas.
• U0365 — OBD2 code U0365 flags a problem with the vehicle network (CAN bus) communication (U0365 - software incompatibility with active safety control module 15). 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.
• U0366 — U0366 - Software Incompatibility With Active Safety Control Module 16 (U0366): 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.