Audi S4 Electrical Glitches: Nav System Dead Alert

Had a similar issue with my 2014 Audi S5 last year. Have some experience with ECU problems and electrical gremlins in these models. The symptoms you describe match exactly what I encountered, multiple electrical glitches and navigation failures pointed to a control module issue. After running basic diagnostics myself, the control unit showed implausible values and needed a complete software reset. Took it to a workshop where they confirmed the ECU problems were due to a software malfunction in the main control module. The fix involved reprogramming the control unit and updating all module software to the latest version. Total cost was 240 Euro for diagnostics and programming. The software reset resolved all electrical issues and everything has worked perfectly since then. These control module problems are not uncommon in this platform. To provide more specific advice about your situation, could you share: Complete error messages you are seeing, Whether other electrical systems are affected, If the issues started suddenly or developed gradually, If any recent work was done on the electrical system This would help determine if your S4 is facing the same control unit issues I experienced.

Last service was at 74440KM. After onboard diagnostics, I discovered the navigation glitch appears intermittently and coincides with other electrical fluctuations. Our workshop confirmed through testing that a software recalibration might resolve these issues. They are scheduling a comprehensive software update next week, quoted at 280 Euro for the complete service. The vehicle software anomalies seem consistent with what you experienced. Good to know the programming resolved similar symptoms. Will update on results after the scheduled maintenance.

Thanks for the update on your S4. Those mileage-based issues align perfectly with what I experienced. The quoted 280 Euro for the software update is reasonable and close to what I paid for similar work. The intermittent navigation glitches combined with electrical fluctuations strongly indicate a control module communication problem, exactly like my case. The control unit often needs recalibration around this mileage point due to accumulated software bugs in the system. After my vehicle software update, the workshop also performed a complete control module reset to ensure all systems synced correctly. This extra step proved crucial for long-term stability. Might be worth asking if thats included in your scheduled service. The software reset fixed not just the obvious navigation issues but also cleared up minor electrical quirks I hadnt even noticed were developing. Looking forward to hearing if your results match my experience after the update. Also worth mentioning, following the control unit reprogramming, I noticed improved system responsiveness overall. Keep track of any performance changes you observe after the update.

Great to hear about the workshop confirming the diagnosis. The recurring electrical fluctuations with navigation issues definitely point toward a software malfunction, similar to others experiences. The 280 Euro quote sounds fair considering the comprehensive vehicle software work needed. My onboard diagnostics showed multiple error codes related to these control module issues. Since the problems appeared after reaching 74000km, this reinforces the theory about software calibration being needed at this service interval. Will document all electrical symptoms before and after the software update next week to track improvements. The workshop mentioned the control unit reprogramming should address both the navigation system and other electrical anomalies, which matches the feedback about comprehensive fixes. Hoping the software reset provides the same long-term solution others have experienced. Will post an update after the scheduled maintenance to confirm if the control module update resolved everything. Thanks for sharing the detailed repair experience, it helped validate the diagnosis and planned fix.