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

• U1048 — U1048 — SCP (J1850) Invalid or Missing Data for Primary Id. 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.
• U1049 — SCP (J1850) Invalid or Missing Data for Primary Id (U1049): 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, aftermarket equipment interfering with the bus, poor grounds or low battery voltage.
• U1050 — U1050 — SCP (J1850) Invalid or Missing Data for Brakes. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.
• U1051 — U1051 — SCP (J1850) Invalid or Missing Data for Brakes. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub, failed wheel speed sensor.
• U1053 — U1053 — SCP (J1850) Invalid or Missing Data for Steering / Steering Wheel. 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, corroded connectors, especially in wet areas.
• U1058 — U1058 — SCP (J1850) Invalid or Missing Data for Transmission / Transaxle / PRNDL. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: faulty transmission speed sensor, internal mechanical wear (clutches, torque converter), valve body wear.
• U1059 — SCP (J1850) Invalid or Missing Data for Transmission / Transaxle / PRNDL (U1059): a vehicle network fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, faulty transmission speed sensor, internal mechanical wear (clutches, torque converter).
• U1060 — U1060 — SCP (J1850) Invalid or Missing Data for Primary Id. 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, water ingress in harness junctions, aftermarket equipment interfering with the bus.
• U1062 — OBD2 code U1062 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for primary id). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground.
• U1063 — OBD2 code U1063 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for primary id). Short, gentle driving to a shop is usually possible. Common culprits: water ingress in harness junctions, corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground.
• U1064 — U1064 — SCP (J1850) Invalid or Missing Data for Primary Id. 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, corroded connectors, especially in wet areas.
• U1065 — U1065 — SCP (J1850) Invalid or Missing Data for Primary Id. 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.
• U1066 — SCP (J1850) Invalid or Missing Data for Primary Id (U1066): 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, a faulty module pulling the bus down, water ingress in harness junctions.
• U1067 — SCP (J1850) Invalid or Missing Data for Primary Id (U1067): 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, corroded connectors, especially in wet areas, aftermarket equipment interfering with the bus.
• U1068 — SCP (J1850) Invalid or Missing Data for Primary Id (U1068): 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, poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground.
• U1069 — U1069 — SCP (J1850) Invalid or Missing Data for Primary Id. 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, a faulty module pulling the bus down, corroded connectors, especially in wet areas.
• U1070 — OBD2 code U1070 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for engine sensors). 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, a faulty module pulling the bus down.
• U1073 — OBD2 code U1073 flags a problem with the engine cooling and temperature control (SCP (J1850) invalid or missing data for engine coolant). Short, gentle driving to a shop is usually possible. Common culprits: low coolant level or air in the system, thermostat stuck open or closed, water pump or radiator issues.
• U1074 — U1074 — SCP (J1850) Invalid or Missing Data for Engine Oil. 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.
• U1075 — OBD2 code U1075 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for engine oil temp). 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.
• U1076 — SCP (J1850) Invalid or Missing Data for Primary Id (U1076): 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, aftermarket equipment interfering with the bus, water ingress in harness junctions.
• U1077 — OBD2 code U1077 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for primary id). 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, corroded connectors, especially in wet areas.
• U1078 — OBD2 code U1078 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for primary id). 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.
• U1079 — U1079 — SCP (J1850) Invalid or Missing Data for Primary Id. 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, damaged CAN bus wiring or short to power/ground.