Function Check

Check Electronic Power Control (EPC) Warning Lamp In Instrument Cluster

Significance of EPC warning lamp

"EPC" is an abbreviation and stands for Electronic Power Control and means "electronic engine load control" (E-gas).

Installation location of EPC warning lamp







If malfunctions are recognized in the E-gas system during operation of the engine, the Engine Control Module (ECM) switches on the EPC warning lamp. (These malfunctions are listed in the DTC table). An entry is made in DTC memory at the same time.

Recommended special tools and equipment

- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1594 connector test kit
- Wiring diagram

Test requirement







- The respective fuses of instrument cluster must be OK.

Test sequence

- Switch on ignition: EPC warning lamp must light up.

If EPC warning lamp does not light up when ignition is switched on:
- Switch ignition off.
- Remove instrument cluster.
- Check wire connection of databus to instrument cluster.

If no malfunction is detected in wire connection to instrument cluster:
- Replace instrument cluster.

If EPC warning lamp lights up when ignition is switched on:
- Start engine and let run at idle: The EPC warning lamp must go out after a few seconds.

If EPC warning lamp does not go out:
- Check DTC memory of Engine Control Module (ECM), Diagnostic mode 3: Check DTC memory. Diagnostic Mode 3: Check DTC Memory
- Repair existing malfunctions and erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes