Is the harness broken when epc light is on?

EPC stands for engine electronic stability system. Constant light indicates that the engine and electronic system are out of order. If the light stays on after ignition or during driving, the throttle may be dirty and should be cleaned. It is also possible that the brake light is not on, so it is necessary to check the brake switch and wiring.

Also, due to the oil problem, the EPC fault light will also light up.