Q5 ABS Light & Traction Issues Need Expert Fix

Had the same issue on my 2011 Audi A4 2.0T. The ABS malfunction ended up being more than just a sensor problem. When the dashboard warning appeared, initial diagnostic tests pointed to the ABS control unit rather than individual sensors. The control unit needed complete replacement as moisture had damaged internal components. This explained both the speedometer fluctuations and traction control issues. The repair involved removing the old unit, programming and calibrating the new one to communicate properly with other vehicle systems. This is considered a serious repair since the ABS system is critical for safety. The job requires specialized diagnostic equipment to properly code the new unit. After replacement, all systems needed testing to ensure proper integration with the cars electronic systems. Worth noting the symptoms matched exactly, persistent ABS light on dashboard and reduced traction control performance. Would suggest getting a second opinion from a shop that specializes in Audi electronic systems, as general mechanics sometimes misdiagnose these specific control unit failures as simple sensor issues.

Thanks for sharing this experience. I had nearly identical symptoms with my Q5 last winter. Those control unit failures can be tricky to diagnose correctly. My transmission and ABS started acting up at the same time, causing the ECM to throw multiple error codes. Could you remember roughly how much the repair cost in your case? Also curious if youve had any other dashboard warning lights or ABS issues since getting it fixed? Mine has been running fine for 6 months but always good to know what to watch out for.

Thanks for asking about the follow-up. Since getting the affected control unit replaced, the speed signal fault cleared completely and the ABS system has worked flawlessly. The repair cost me 1000 Euro for the complete job, including programming and testing the new unit with the ECM. The dashboard has stayed clear of warning lights since the fix. The input from the ABS sensors now properly communicates with the control module, and the odometer readings are stable. No more error codes or traction issues, even in bad weather. For peace of mind, I regularly check the ABS functionality, but haven't experienced any problems in the 18 months since the repair. The investment was worth it considering how critical these systems are for safety. The specialist shop did a thorough job ensuring all electronic components were properly integrated. Good to hear your Q5 is running well after 6 months, sounds like you also got the right fix for the issue.

After dealing with those annoying ABS issues, I finally got my Q5 properly fixed at a specialized workshop. Took multiple diagnostic tests but they found a faulty control module that was causing both the speedometer issues and traction problems. The ECM was getting confused signals which triggered those persistent dashboard warnings. The total repair came to 1200 Euro including parts and programming. Pretty steep but cheaper than the first shop quoted. The specialist mechanic showed me the corroded components in the old unit which explained the erratic behavior. They ran comprehensive testing after installation to ensure all systems were talking to each other correctly. Six months later and the odometer reads steady, no more warning lights on the dashboard, and the ABS works perfectly even on wet roads. Definitely worth finding the right shop that knows these electronic systems inside out. Much better than throwing parts at the problem hoping it fixes itself.