Audi A6 ECU Issues: Symptoms and Fix Guide

I dealt with a very similar issue on my 2017 Audi A4 last winter and understand your concern about the engine performance problems. Having some experience with automotive electronics, I first suspected a computer module failure, but it turned out to be a faulty main relay affecting the ECU functionality. Initially, the vehicle electronics showed similar symptoms, reduced power and error codes. After investigating multiple potential causes, my workshop identified that the main relay was causing intermittent power supply issues to the engine control unit. The total repair cost was 120 Euro, which included diagnostics and replacing the main relay. The fix completely resolved both the power issues and error codes. The vehicle electronics returned to normal operation immediately after the repair. Before suggesting more specific solutions, could you share: Which exact error codes are stored in your system? Does the reduced power occur immediately after starting or only after driving for a while? Have you noticed any other electrical issues, like flickering lights or inconsistent gauge readings? This information would help determine if your A6 is experiencing the same root cause as my A4 did.

Latest service was at 75000 KM. Yes, I checked those exact points. The error codes in my automotive electronics are P0506 and P0507 specifically. The reduced power occurs about 10 minutes into driving, not immediately on startup. No other electrical issues present, gauges and lights work perfectly normal. The system reset suggestions sound promising. Did your mechanic mention if relay issues could trigger these specific codes? The workshop quoted me 550 Euro for a complete ECU repair, which seems quite steep compared to your relay fix.

Thanks for providing those specific error codes and symptoms. Since my A4 repair experience, I've learned these P0506/P0507 codes typically point to idle control issues rather than the relay problem I encountered. The engine control system is more complex than I initially thought. The car diagnostics in my case showed different error codes, which is why the relay fix worked for me at that lower cost. For your specific codes, a 550 Euro ECU repair quote actually sounds reasonable since idle control problems often require more extensive engine performance troubleshooting. A few things worth checking before committing to the full ECU repair: Throttle body condition and cleaning, Idle air control valve functionality, Vacuum line integrity The timing of your symptoms (10 minutes into driving) suggests the computer module might be responding to actual mechanical issues rather than being faulty itself. My mechanic explained that vehicle electronics often trigger these codes as a protective measure when detecting irregular idle patterns. Consider getting a second opinion focused specifically on the idle control system before proceeding with the full ECU repair. The root cause might be simpler and less expensive to fix than originally quoted.

Thanks for sharing those details and comparing situations. After hearing about your relay experience and pricing, I will definitely seek a second opinion focusing on the idle control system before committing to the full 550 Euro ECU repair. The car diagnostics showing P0506/P0507 codes does suggest a different underlying issue than your case. What you mentioned about the engine control system potentially responding to mechanical problems rather than having a faulty computer module makes a lot sense. I will have another workshop check the throttle body, idle control valve, and vacuum lines first. The engine performance issues starting 10 minutes into driving rather than immediately does hint at a progressive mechanical problem rather than pure automotive electronics failure. Appreciate the detailed breakdown of how your situation differed from mine. This gives me a much clearer path forward with the repair decisions. Will update once I get that second opinion and identify the actual cause behind these system codes.