Audi A1 Cruise Control Failure: Module Error Fix

As a hobby mechanic with some experience, I had a very similar issue with my 2017 Audi A3. The cruise control completely stopped responding, showing the same symptoms you describe. After checking the fault codes, my workshop discovered a damaged cable connection between the cruise control module and the throttle position sensor. The wire harness had some wear and tear causing intermittent connection issues. The repair involved replacing the wiring harness and checking all related plug connections. Total repair cost was 95 Euro, which covered both diagnostics and the repair work. The fix took about an hour and has been working perfectly since then. Before suggesting specific solutions, could you share: Current mileage on your A1, Whether the check engine light is on, If you notice any other electrical issues, Whether the brake lights are functioning normally These details would help determine if your issue matches what I experienced, as faulty brake lights or speed sensor issues can also cause cruise control failures in these models.

Last service completed at 151349 KM. The steering wheel controls and dashboard lights are functioning fine in all other aspects. Had the brake lights checked and they work perfectly normal. No check engine light is showing either. I noticed the issue started gradually, first the cruise control would work intermittently before failing completely. My main concern is whether this could be related to the clock spring, as I heard this can cause similar symptoms and would make the repair significantly more expensive. The throttle position works normally when accelerating and decelerating, so I am hoping it is just a wiring issue like in your case. Would be relieved if it could be fixed for under 100 Euro.

Thanks for providing those additional details. Based on what you describe, this really does sound identical to the wiring issue I encountered with my A3. The gradual failure pattern is particularly telling, this is exactly how mine started before complete failure. Since your throttle position response is normal and the steering wheel controls work for other functions, we can likely rule out a clock spring issue. In my experience, when the clock spring fails, you typically see multiple steering wheel control failures simultaneously, not just cruise control. I checked my old repair documents, the specific issue was corrosion in the wiring harness connector that links to the throttle position sensor. The intermittent behavior happens when the connection deteriorates over time. The good news is this typically requires just cleaning or replacing the connector and associated wiring section. The repair cost should be similar to what I paid (95 Euro), assuming no other complications are found. Since your symptoms match mine exactly, even down to the gradual failure pattern, I would bet on this being the same issue rather than a more complex problem. Just make sure the workshop checks the wiring harness connection points first before replacing any major components. A blown fuse or more serious electrical issue would typically trigger dashboard light warnings, which you are not experiencing.

As the original poster, I want to thank you for the detailed explanation. Your experience matches my situation so closely that I feel much more confident about what to expect now. I will schedule an appointment and specifically ask them to inspect the wiring harness and connections near the throttle position sensor first. The fact that other drivers have resolved this with a relatively simple wiring repair for under 100 Euro gives me hope that I wont need an expensive clock spring replacement or other major work. Just noticed that when checking the fuse box earlier, all the cruise control related fuses appear intact, which further supports your theory about it being a wiring connection issue rather than a blown fuse or more serious electrical problem. Will update once I get it checked out, but wanted to thank you for helping narrow down the likely cause. The gradual failure pattern really does seem to be the key indicator here pointing to wiring rather than component failure.