Audi A6 Cruise Control & Speedometer Failure Fix Needed

Last year my 2006 Audi A4 2.0 TDI had similar symptoms. The cruise control failure combined with speedometer errors often points to a faulty system in the throttle body connection or its wiring harness. The diagnostics revealed multiple stored errors related to the electronic throttle control. After inspection, the main issue was traced to corroded connections in the wiring harness near the throttle body. Several wire terminals had deteriorated due to engine bay heat and moisture exposure. This required removing the throttle body assembly to access the wiring connector. The car electronics needed a full reset after replacing the damaged wiring section. The throttle position sensor also required recalibration using specialized diagnostic equipment. The repair was moderately serious since it affected critical driving functions. Driving with this issue risks sudden drop in power control. The fuse box was also checked during repairs, but it wasnt the source of the problem. Look for a shop with Audi-specific diagnostic tools, as generic scanners might not fully communicate with all control modules. Request they specifically check the throttle body wiring harness and connections before replacing any major components.

Thanks for sharing that experience, actually sounds really similar to what I dealt with on my A6 last month. The steering wheel controls for cruise were completely dead and the speedometer was acting up, just like you described. My case also turned out to be wiring-related malfunction rather than a full throttle body failure. Would you mind sharing what the final repair cost was in your case? I paid 480 Euro for the complete fix, including labor and parts. Just curious if that was in the right ballpark. Also, has everything been working properly since the repair? No more electronic glitches showing up?

Since fixing the cruise control malfunction at the shop, my A4 has been running perfectly. The repair was much simpler and cheaper than expected, just 95 Euro to repair a faulty cable connection near the actuator. The mechanic found that moisture had caused corrosion in a crucial plug connector, leading to the cruise control system failure. No electronic glitches have appeared since then. Your repair cost of 480 Euro seems a bit high compared to my experience, though it might have involved more extensive work on the wiring harness or other components in the fuse box area. The important thing is that both our cars are back to proper working order with functioning cruise control systems. The steering wheel controls and all electronic functions have been working flawlessly for months now. Regular inspections of electrical connections can help prevent these issues from recurring.

The mechanic visit turned out much better than expected. After checking multiple electronic components, they found the non-functional cruise control was due to a simple wiring issue near the throttle body. The diagnostics revealed corroded connections that were causing intermittent failures in the system. The total repair took about 3 hours and cost 480 Euro, which included a thorough check of the car electronics and replacement of some damaged wiring. While this was more expensive than some similar repairs, the shop did a complete diagnostic scan and fixed several potential issues that could have caused problems later. Since the repair, the cruise control and speedometer have been working perfectly. No more error messages or electronic glitches. The actuator response is much smoother now, and all steering wheel controls are functioning as they should. Definitely worth getting it properly fixed rather than trying temporary solutions or ignoring the problem.