What causes edc light to come on?

The EDC (Electronic Diesel Control) light typically illuminates when there is an issue with the engine management system, particularly in diesel engines. Common causes include problems with the fuel system, such as low fuel pressure or contaminated fuel, as well as issues with sensors (like the mass airflow sensor or oxygen sensors) or the exhaust system. It can also indicate malfunctions in the engine's performance or emissions systems. If the light comes on, it's advisable to have the vehicle diagnosed with a scan tool to identify the specific issue.