The EPC light or Electronic Power Control light is a warning signal that lights up when there’s a problem with the systems and sensors in the engine. The exact cause could be related to any number of things, including throttle, fuelling, traction control or cruise control and indicates you should take the car to a workshop capable of reading the fault codes via diagnostic equipment. This will then help the mechanic track down the exact cause of the issue and fix it or replace the faulty component as required.