Electronic Power Control (EPC) Warning Light

Electronic Power Control (EPC) warning lamp in instrument cluster, significance

The Electronic Power Control (EPC) warning lamp is the Malfunction Indicator Lamp for the electronic accelerator (EPC) system.

Location of EPC warning lamp







The engine control module checks all the important functions of the electronic accelerator system after switching on the ignition.

The engine control module switches the EPC warning lamp on for about 1 second during the test of this component. If a malfunction is recognized during the test, the lamp will light continuously.

If malfunctions are recognized in electronic accelerator system (EPC) when the engine is in operation, the engine control module will switch on the EPC lamp (these malfunctions are marked in the Diagnostic Trouble Code (DTC) table). Simultaneously an entry is made in the engine control module DTC memory.

Functional check
- Switch ignition on:

EPC warning lamp must light up.

If the EPC warning lamp does not light-up with ignition switched on:
- Check instrument cluster and EPC warning lamp as follows:

If the EPC warning lamp lights up with ignition switched on, continue check as follows:

- Start engine and run at idle speed:

EPC warning lamp must go out after a few seconds.

If the EPC warning lamp does not go out:

- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, Diagnostic Trouble Code (DTC) memory, checking and erasing. Reading Diagnostic Trouble Codes
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes