Audi S6 Electronics Failure: Speedometer & Cruise Issues

Had similar electronics malfunction on my Audi S4 2017. The cruise control and speedometer issues often trace back to faulty wiring connections at the steering wheel control module. The diagnostics revealed multiple error codes related to the control area network. Root cause was a damaged wiring harness where cables connect to the steering angle sensor. Over time, constant steering wheel movement can wear down these connections. This turned into a serious repair job because accessing the steering column components required partial dashboard removal. The fix involved replacing the entire steering angle sensor unit and rewiring the connections. Several electronic systems are interconnected here, when the steering angle sensor fails, it affects speedometer readings and disables cruise control as a safety measure. Unusual error messages are typical symptoms of this issue. Getting this fixed requires proper diagnostic equipment and expertise with Audi electronics systems. Would recommend having it checked at a shop that specializes in German car electronics, as generic scanners might not catch the specific malfunction codes. Common problem that needs proper attention, driving with faulty steering sensors can affect other electronic safety systems.

Thanks for sharing your experience. I had those exact steering wheel control module issues with my S6 last winter. The entire module needed replacement due to corrupted firmware. The cruise control stayed non-functional for weeks until proper diagnostics revealed the root cause. Can you share how much the repair ended up costing you? Did you experience any electronic malfunctions after the fix? Just want to compare notes since these issues can be quite tricky to diagnose correctly.

Good to share that fixing the faulty system with my S4 proved successful. The entire repair, including resolving the cruise control problems, came to 95 Euro, mainly covering the cable and plug connection replacement. Since the repair, all electronics have worked flawlessly. The key was finding a mechanic who properly diagnosed the steering wheel control module issues. Getting the right diagnostic equipment made all the difference in pinpointing the exact connection problem in the fuse box area and throttle body sensors. Unlike your experience with firmware issues, my repair was straightforward once they identified the loose connections. The cruise control and all related functions returned to normal immediately after the fix, with no recurring electronic glitches. The relatively low repair cost in my case shows how important accurate diagnostics are, sometimes its just a simple connection issue rather than needing complete module replacement.

Following up on my earlier posts, finally got the S6 properly fixed last week. After getting a second opinion, took it to a certified Audi specialist who actually knew what they were doing with car electronics. The actuator in the steering wheel control module needed a complete replacement, plus they found some damaged wiring. Total repair came to 780 Euro including diagnostics and labor. More than expected, but worth it to have everything working properly again. The speedometer now works perfectly and the cruise control functions like new. No more unusual error messages or electronic malfunctions popping up on the dashboard. What a relief after dealing with this headache for weeks. Far better experience than my first mechanic visit where they just ran basic diagnostics and couldn't figure out the real problem. Lesson learned, finding the right specialist makes all the difference with modern car electronics.