VW Polo ABS Warning + Traction Loss Needs Diagnosis

Recently dealt with similar symptoms on my 2006 VW Golf TDI. The ABS warning light combined with traction issues pointed to a wheel speed sensor failure, but the diagnostic revealed a more complex issue with the ECM and ABS control module communication. The input from the wheel speed sensors was reaching the ABS module, but the signal processing was faulty. The mechanic ran a full diagnostic scan which showed multiple error codes related to the ABS control unit. The control unit itself was defective and required replacement, as internal electronic components had failed. This is considered a serious issue since it affects critical safety systems. The ABS, traction control, and stability systems all rely on proper control unit function. Without repair, the risk of losing control during emergency braking or adverse weather conditions increases significantly. The transmission also started showing erratic behavior because modern systems use wheel speed sensor data for various functions. The repair involved replacing the ABS control unit and recalibrating the entire system. After installation, all sensors needed proper initialization to communicate correctly with the new unit. Worth getting this checked immediately, as driving with compromised ABS and traction control puts both vehicle and occupants at risk.

Thanks for that detailed response about the control unit malfunction. Your situation sounds very similar to mine. Did you recall roughly how much the ABS control unit replacement ended up costing? Also curious if the speedometer and other systems have been working properly since the repair. Mine started showing some odd readings on the dash recently too.

Since getting the ABS control unit replaced, all systems are working flawlessly, including the speedometer which had been showing incorrect readings on the odometer. The Speed signal fault was completely resolved after fixing the defective control unit. The total repair came to 1000€ for parts and labor, which included diagnostic testing and recalibration of all related systems. While it was a significant expense, having reliable ABS and traction control functioning properly again made it worthwhile for safety reasons. The ECM now communicates perfectly with all sensors, and the dashboard readings are accurate. The mechanic explained that these control unit failures are somewhat common in older VW models, and waiting too long for repair can lead to additional complications with connected systems. My recommendation would be to have it checked soon, as the symptoms you describe match exactly what I experienced before the repair.

I took my Polo to the mechanic yesterday after reading about your similar experience. The diagnostic confirmed it was indeed the ABS control unit causing the malfunction. My mechanic found multiple error codes during testing, just like in your case. The total bill came to 950€ including parts, labor and system recalibration. Initially felt like a hefty cost, but the difference in driving performance is remarkable. The ECM is now properly communicating with all systems, the speedometer readings are accurate again, and most importantly the ABS and traction control are working perfectly. Had a chance to test it this morning in wet conditions and the improvement in grip and braking response is significant. The dashboard warning lights have all cleared and the odometer is reading correctly now too. Definitely worth getting it fixed rather than risk any safety issues. Thanks for sharing your experience, it helped me identify the problem quickly and avoid potentially more expensive repairs down the line.