Wiring Issuesīecause of all the electronic wiring in modern cars, there is a high risk that there is a wiring problem that is causing the EPC light. Keep reading to find out how to determine which of these sensors is causing the EPC light. Some of the engine sensors that can trigger the EPC light are the MAF sensor, the IAT sensor, the ECT sensor, or the O2 sensor. It is therefore important to read the trouble codes when you see the EPC light to be able to pinpoint where the problem is. The EPC system uses a lot of different engine sensors to function properly, and if there is an issue with one of the engine sensors, it could result in an EPC light on your dashboard. RELATED: 4 Signs of a Bad Steering Angle Sensor (& Replacement Cost) 6. This clock spring is known to fail, and if it fails, it may look like a problem with the steering angle sensor. To be able to turn the steering wheel, there is also a clock spring where the wires to the steering wheel angle sensor and the steering wheel buttons go. The EPC system will use this information to determine which direction you turn the steering wheel and correct the brake force with this information. The steering angle sensor sits behind your steering wheel and is used to measure which position the steering wheel is in. Often you need to replace the entire ABS control module if there is a problem with the sensor, which can be very expensive. Unfortunately, the brake pressure sensor on many VW models is located inside the ABS control module, making it quite difficult to replace. The brake pressure sensor works like the brake light switch, but it doesn’t just measure ON/OFF, it actually measures the brake pressure you apply through the brake pedal. If you have a Volkswagen car and an EPC light on your dashboard, there is a high risk that the brake pressure sensor has failed. READ MORE: 4 Signs of a Bad ABS Wheel Speed Sensor (Replacement Cost) 4. It can also be an issue with the ABS reluctor ring, from which the ABS sensor is measuring the speed from. The ABS sensors are located on the wheel hubs and are very exposed to dirt, rust, and water, and are therefore prone to failure. It uses this information mainly for the ABS system, but there are other systems that use this information and the EPC system is one of them. The ABS sensors measure the speed of each wheel on your car. READ MORE: 5 Symptoms of a Bad Brake Light Switch (& Replacement Cost) 3. If there is a problem with the brake pedal switch, the EPC system will not be able to recognize when you press the brake pedal or not, and therefore it will illuminate the EPC light and store a fault code. The switch is also used for other functions such as the cruise control system or the EPC system. The brake pedal switch or brake light switch is used to know when you press the brake pedal, so the car should activate the brake lights. RELATED: 8 Symptoms of a Bad Throttle Body (& Replacement Cost) 2. Most throttle bodies today are electric, and if there is a problem with it, it will light up a check engine light and an EPC light on your dashboard. The EPC system uses the throttle body to control the engine power, and if there is an issue with the throttle body, the EPC system will not be able to function properly. The throttle body controls how much air should enter the engine when you press the gas pedal. Here are a few of the issues that could trigger the EPC light: 1. It can also be caused by wiring issues or other electrical issues. The most common causes of an EPC light are a faulty throttle body, a faulty ABS sensor, a cracked ABS ring, a bad brake pressure sensor, or a faulty brake pedal switch. RELATED: How Many Car Brands Does Volkswagen Own? What Causes An EPC Light? The EPC system is Volkswagen Group’s traction control system, and therefore you will also find the EPC system in Audi, Skoda and Seat car models. The Electronic Power Control system is monitored by the engine control unit, brake control unit, transmission control unit, and steering control unit. The EPC light often shows up together with the Engine, ABS, or ESP Light, depending on where the problem is. It means there is a trouble code stored in the EPC system. The EPC light is a warning light related to your vehicle’s electronic power control (EPC) system.
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