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EPC Light and Reduced Power on my 2017 Audi A6 2.0T

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Mike T. · rep 0 · May 26, 3:45 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A6 2.0T Premium Plus

Hello A6 owners! I'm experiencing a worrying problem with my 2017 Audi A6 2.0T Premium Plus. While driving, the EPC (Electronic Power Control) light came on, and the car immediately went into a reduced power mode. It felt like I lost most of the acceleration and the engine just wouldn't rev up properly.

I pulled over, turned the car off and on again, and the light went away for a bit, but then came back. I'm afraid to drive it too much like this. What could be causing this? Is it safe to drive to a mechanic, or should I get it towed? Any insights or similar experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:45 AM

0

ClearTheCode admin answer:

The EPC (Electronic Power Control) light indicates a problem with the electronic throttle control system, which manages engine power output. When it comes on, especially with reduced power (often called 'limp mode'), it's a clear signal that something is amiss. Driving extensively in limp mode is generally not recommended as it can potentially exacerbate an underlying issue.

Common Causes for EPC Light & Reduced Power:

  1. Throttle Body Malfunction: A dirty or faulty throttle body is a very common culprit. Carbon buildup can prevent the throttle plate from opening or closing correctly.
  2. Accelerator Pedal Position Sensor: The sensor that translates your pedal input into an electronic signal could be failing.
  3. Brake Light Switch: Believe it or not, a faulty brake light switch can sometimes trigger the EPC light as it's part of the engine's control system.
  4. Ignition System Issues: Problems with spark plugs, ignition coils, or even fuel injectors can sometimes manifest with an EPC light.
  5. Vacuum Leaks: Leaks in the intake system can throw off air-fuel mixture readings, leading to performance issues and an EPC light.

Relevant OBD-II Codes:

  • P2101 - Throttle Actuator Control Motor Circuit Range/Performance
  • P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem
  • P0221 - Throttle Position Sensor/Switch B Circuit Range/Performance Problem
  • P0300 series (P0301-P0306) - Misfire Detected

What to Do:

  1. Get a Diagnostic Scan: The absolute first step is to get the vehicle scanned for fault codes using an OBD-II scanner. Many auto parts stores offer this service for free. The specific code will narrow down the potential issues significantly.
  2. Check Brake Lights: Verify your brake lights are working correctly. If not, replacing the brake light switch is a cheap and easy fix.

When to See a Shop:

While you might be able to drive it a short distance to a mechanic if the limp mode isn't severe, it's best to have it towed if the power reduction is significant or if the light keeps coming back immediately. A professional shop can accurately diagnose the problem using specialized tools and perform necessary repairs, whether it's cleaning/replacing the throttle body, replacing a sensor, or addressing ignition system components.

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