An EPC (Electronic Power Control) is a computerized ignition and engine management system found in many VAG Group (Audi, Skoda, Volkswagen, Seat) vehicles.
Most of the time, a lit EPC warning light on the dash brings noticeable changes to a car’s operation, such as sluggish performance and loss of power (LIMP mode).
Not always when an EPC light comes on is an engine problem. A variety of malfunctions or issues could trigger the EPC warning light.
Originally designed to manage ignition and throttle functions, the EPC’s role now includes overseeing a number of electronic systems such as electronic stability control (ESP), ABS, power steering, and cruise control.
In normal operation, the vehicle’s electronic control unit (ECU) is the “brain” of the car, allowing the engine, transmission, and other systems to function properly.
What to do if an EPC warning light comes on in the dashboard
The EPC works together with the ECU to monitor functions. If something is not working in the parameters, then an EPC light stays on intermittently on the board.
At the same time, depending on the fault, other warning lights, such as the Check Engine warning light, may come on. The cruise control system may turn itself off and the electronic stability control (ESP) may stop working. The warning light can also light up due to a problem with the ABS system.
To try to protect the engine, the EPC system might activate a failure mode. This will drastically reduce engine power. Don’t panic, keep driving to your destination and go to a car service for diagnostics and repairs.
Even if the car appears to be operating normally, do not continue to drive longer than necessary.
Use an OBDII diagnostic to find out what errors are being logged by the car. Most of the time, a machine will show several errors, and the first one sometimes triggers the rest.
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After the repair is done and the fault code is cleared, the EPC dash light will disappear.
10 Possible faults that illuminate the EPC warning light
The most common causes of an EPC light are:
- faulty throttle,
- a faulty ABS sensor, a cracked ABS ring,
- a faulty brake pressure sensor
- a faulty brake pedal switch
- wiring issues or other electrical issues.
- Engine speed sensor,
- ESP failure,
- cruise control system malfunction,
- brake light switch faulty,
- issues with the emission measurement system.