diagnostic trouble code

A **diagnostic trouble code** (DTC) is a specific code generated by a vehicle’s onboard diagnostic system that signals a problem or issue within the vehicle. These codes help mechanics and vehicle owners identify the root cause of engine, transmission, or other system malfunctions. Understanding and interpreting DTCs is essential for effective vehicle maintenance and timely repairs. This tag covers topics related to reading, clearing, and troubleshooting diagnostic trouble codes using OBD-II scanners and other diagnostic tools.