Alfa Romeo Stelvio Brake Warning Light Fix Guide

As someone with some experience working on cars, I had a very similar issue with my 2017 Giulia diesel. The brake pedal sensor was triggering warning lights and affecting various vehicle safety systems. After checking online forums, I discovered this was often caused by dirt accumulation around the brake pedal switch. The brake system warning lights can be triggered when debris interferes with the sensor contacts. The fix was surprisingly simple and cost nothing. I cleaned the area around the brake pedal switch with electrical contact cleaner, paying special attention to the mechanical parts of the switch. This completely resolved the warning lights and error codes. Before attempting any repairs on your Stelvio, could you share: Does the brake light warning appear immediately when starting the car? Are there any noticeable changes in brake pedal feel? Which specific error codes are stored? Have you noticed any other electrical issues? This information would help determine if your situation matches what I experienced or if you might be dealing with a different brake system issue that requires professional attention. Basic troubleshooting like checking the brake pedal switch area for debris might save you an unnecessary workshop visit, but never compromise on vehicle safety if youre unsure about any repair steps.

Latest service was at 65000 KM, about 2 months ago. Thanks for sharing your experience. I do see similar symptoms. The brake light warning comes on out of nowhere while driving, not at startup. The brake pedal feels normal with no changes in pressure or response. The stored error code is P0504 (Brake Switch A/B Correlation). No other electrical problems noted. I will try cleaning the automotive switch contacts first, as suggested. The brake switch area does look a bit dirty, so this could be causing the intermittent warnings affecting the vehicle safety systems. If cleaning doesnt resolve it, I might need a complete switch replacement. Anyone know the typical cost range for parts and labor on these? In the meantime, I am documenting when these warnings occur to help identify any patterns. Will update once I try the cleaning solution.

Thanks for the detailed follow-up about your Stelvio. The P0504 code definitely points to a brake switch correlation issue, just like I experienced with my Giulia. The unusual warnings while driving versus at startup actually makes the brake switch theory even more likely. When these automotive switches get dirty or start failing, they often create intermittent signals that confuse the vehicle safety systems. After I cleaned mine, I monitored it for about 2 weeks before considering the problem fully resolved. If cleaning doesnt work, a new brake switch typically costs between 50 Euro-120 Euro, with labor usually running another 80 Euro-150 Euro depending on access difficulty. The electrical issue you describe matches the classic symptoms of a failing brake switch, unusual warnings without actual brake performance problems. Since your brake pedal feel remains normal, this further supports a switch-related problem rather than a mechanical brake system issue. Keep monitoring those warning patterns, in my case, they occurred more frequently during wet weather, which was another clue pointing to electrical contact issues. Let us know how the cleaning works out. If you need specific guidance on accessing the switch area safely, just ask.

Thanks everyone for the helpful advice. I can confirm the cleaning of the brake switch worked perfectly. After using electrical contact cleaner and letting it dry completely, I haven't seen any brake light warnings for a week now. The P0504 error code is gone too. This saved me from an expensive switch replacement and unnecessary workshop visit. The vehicle safety systems are all functioning normally again. Will keep monitoring the situation, but its good to know the typical costs for a brake switch replacement (50 Euro-120 Euro plus labor) in case the problem returns. For anyone searching with similar issues, definitely try cleaning the automotive switch first if you have unusual brake light warnings with normal brake pedal feel. Just ensure you use proper electrical contact cleaner and wait for it to dry fully before testing. Really grateful for all the guidance here. Made what seemed like a complex electrical issue into a simple DIY fix.