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

• U0578 — U0578 — U0578 - Invalid Data Received From Active Safety Control Module 141. 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, corroded connectors, especially in wet areas.
• U0579 — U0579 - Invalid Data Received From Active Safety Control Module 142 (U0579): 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, aftermarket equipment interfering with the bus.
• U0580 — OBD2 code U0580 flags a problem with the vehicle network (CAN bus) communication (U0580 - invalid data received from active safety control module 143). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground.
• U0581 — U0581 - Invalid Data Received From Active Safety Control Module 144 (U0581): 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, aftermarket equipment interfering with the bus.
• U0582 — OBD2 code U0582 flags a problem with the vehicle network (CAN bus) communication (U0582 - invalid data received from active safety control module 145). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas.
• U0583 — U0583 — U0583 - Invalid Data Received From Active Safety Control Module 146. 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, poor grounds or low battery voltage.
• U0584 — OBD2 code U0584 flags a problem with the vehicle network (CAN bus) communication (U0584 - invalid data received from active safety control module 147). Short, gentle driving to a shop is usually possible. Common culprits: damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus, water ingress in harness junctions.
• U0585 — U0585 - Invalid Data Received From Active Safety Control Module 148 (U0585): 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, poor grounds or low battery voltage, corroded connectors, especially in wet areas.
• U0586 — U0586 - Invalid Data Received From Active Safety Control Module 149 (U0586): 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, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.
• U0587 — Invalid Data Received From With Radiator Anti Tamper Device (U0587): 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, water ingress in harness junctions, aftermarket equipment interfering with the bus.
• U0588 — Invalid Data Received From Transmission Fluid Pump Module (U0588): a vehicle network fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter), low or degraded transmission fluid.
• U0589 — U0589 — Invalid Data Received From DC to AC Converter Control Module "A". 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, corroded connectors, especially in wet areas, a faulty module pulling the bus down.
• U058A — U058A — Invalid Data Received From DC to AC Converter Control Module "B". 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, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.
• U0590 — U0590 - Invalid Data Received From Active Safety Control Module 153 (U0590): 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, poor grounds or low battery voltage.
• U0591 — U0591 — U0591 - Invalid Data Received From Active Safety Control Module 154. 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, water ingress in harness junctions.
• U0592 — U0592 — Invalid Data Received From Gear Shift Control Module "B". A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid.
• U0593 — U0593 — Invalid Data Received From Drive Motor Control Module "B". 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.
• U0594 — U0594 — Invalid Data Received From Hybrid Powertrain 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, poor grounds or low battery voltage, corroded connectors, especially in wet areas.
• U0595 — U0595 — Invalid Data Received From Powertrain Control Monitor Module. 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, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.
• U0596 — OBD2 code U0596 flags a problem with the vehicle network (CAN bus) communication (invalid data received from AC to AC converter control module). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, corroded connectors, especially in wet areas, aftermarket equipment interfering with the bus.
• U0597 — U0597 — Invalid Data Received From AC to DC Converter Control Module "A". 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, corroded connectors, especially in wet areas.
• U0598 — Invalid Data Received From AC to DC Converter Control Module "B" (U0598): 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, damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas.
• U0599 — OBD2 code U0599 flags a problem with the vehicle network (CAN bus) communication (invalid data received from DC to DC converter control module "A"). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, corroded connectors, especially in wet areas, water ingress in harness junctions.
• U059A — U059A — Invalid Data Received From DC to DC Converter Control Module "B". 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.