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

• U1192 — SCP (J1850) Invalid or Missing Data for Primary Id (U1192): 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, corroded connectors, especially in wet areas, water ingress in harness junctions.
• U1193 — OBD2 code U1193 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: damaged CAN bus wiring or short to power/ground, water ingress in harness junctions, aftermarket equipment interfering with the bus.
• U1194 — OBD2 code U1194 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for mirrors). 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, water ingress in harness junctions.
• U1195 — OBD2 code U1195 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for mirrors). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground.
• U1196 — U1196 — SCP (J1850) Invalid or Missing Data for Door Locks. 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, water ingress in harness junctions.
• U1197 — OBD2 code U1197 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for door locks). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, corroded connectors, especially in wet areas, water ingress in harness junctions.
• U1199 — U1199 — SCP (J1850) Invalid or Missing Data for External Access (Doors). 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.
• U1200 — U1200 — SCP (J1850) Invalid or Missing Data for Seat Motion / Control. 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.
• U1201 — OBD2 code U1201 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for seat motion / control). 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.
• U1202 — OBD2 code U1202 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for windows). 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.
• U1203 — SCP (J1850) Invalid or Missing Data for Windows (U1203): 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, water ingress in harness junctions.
• U1204 — SCP (J1850) Invalid or Missing Data for Steering Column (U1204): 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, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.
• U1206 — OBD2 code U1206 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, damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage.
• U1207 — U1207 — 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, poor grounds or low battery voltage.
• U1208 — OBD2 code U1208 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for seat switches). 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, aftermarket equipment interfering with the bus.
• U1209 — OBD2 code U1209 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for seat switches). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, a faulty module pulling the bus down, poor grounds or low battery voltage.
• U1210 — OBD2 code U1210 flags a problem with the airbag / restraint system (SRS) (SCP (J1850) invalid or missing data for restraints). Short, gentle driving to a shop is usually possible. Common culprits: failed clockspring (driver airbag circuit), faulty impact or occupancy sensor, depleted backup battery or low system voltage.
• U1211 — OBD2 code U1211 flags a problem with the airbag / restraint system (SRS) (SCP (J1850) invalid or missing data for restraints). Short, gentle driving to a shop is usually possible. Common culprits: depleted backup battery or low system voltage, SRS control module fault or stored crash data, faulty impact or occupancy sensor.
• U1212 — SCP (J1850) Invalid or Missing Data for Primary Id (U1212): 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, a faulty module pulling the bus down.
• U1213 — OBD2 code U1213 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: a faulty module pulling the bus down, aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground.
• U1215 — SCP (J1850) Invalid or Missing Data for Primary Id (U1215): 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.
• U1216 — U1216 — SCP (J1850) Invalid or Missing Data for External Lamp Outage. 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.
• U1217 — U1217 — SCP (J1850) Invalid or Missing Data for External Lamp Outage. 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, a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground.
• U1218 — SCP (J1850) Invalid or Missing Data for External Lamps (U1218): 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, corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground.