VW Up Belt Tensioner Making Strange Noises, Fix Tips

The belt squeal symptoms you describe with the VW Up electric match what I experienced with my 2017 VW e-Golf. The serpentine belt tensioner required complete replacement after similar noise patterns developed. Initial symptoms started with intermittent squealing, particularly during cold starts. The automobile maintenance inspection revealed significant wear on the tensioner pulley bearings, which caused improper belt alignment and tension. This created uneven pressure across the belt system. The issue requires immediate attention. A failing belt tensioner can lead to complete serpentine belt failure, which affects multiple engine components including the alternator, power steering, and AC compressor. In my case, the tensioner assembly had worn prematurely due to a manufacturing defect. The repair process involved: Complete tensioner assembly replacement, New serpentine belt installation, Pulley alignment check, Belt tension adjustment Post-repair, engine performance returned to normal with no belt noise. While this was a serious repair requiring specialized tools, addressing it early prevented more extensive damage to other components. For proper diagnosis, have a mechanic specifically check: Belt tension measurements, Tensioner pulley movement, Bearing wear patterns, Belt alignment across all pulleys

Thanks for sharing that detailed experience. I also had the same symptoms and resolution with my VW Up last year. The serpentine belt and idler pulley both needed replacement after similar noises started. Quick question, do you remember the total repair cost for the tensioner and belt work? Also curious if youve had any related issues since the fix? My repair has held up well so far but always good to know what to watch for with these timing belt systems.

The total repair cost for the tensioner replacement came to 455€, which included both parts and labor. The idler pulley and belt tensioner system have worked flawlessly since the repair. Early detection of the failing belt tensioner saved additional engine components from potential damage. The automobile maintenance tech confirmed the original diagnosis was spot on, the tensioner pulley had developed excessive play, causing improper belt tracking. The repair involved a complete tensioner assembly replacement along with new bearings to ensure optimal engine performance. After 8 months and several thousand kilometers, the belt system continues running smoothly with no noise or tension issues. Regular inspections show proper belt alignment and normal wear patterns. The tensioner pulley maintains correct pressure, which is crucial for the entire belt drive system. For preventive maintenance, it helps to listen for any unusual sounds during cold starts and monitor belt tension during routine service checks. A properly functioning belt tensioner system is essential for long-term reliability.

Following my mechanic visit last week, I wanted to update on my VW Up belt tensioner situation. After hearing the concerning engine noise, I took it to a certified shop that specializes in electric vehicles. The diagnosis confirmed what many suggested, the serpentine belt tensioner needed replacement. Total cost came to 480€ including parts and labor. The mechanic found significant wear on the tensioner pulley, which explained the unusual sounds during startup. The repair was completed in about 3 hours. They replaced both the tensioner assembly and the belt drive components. Engine performance improved immediately, and the squealing noise completely disappeared. Its been a week since the fix, and everything runs perfectly now. No more strange noises during cold starts, and the belt tension stays consistent. Will keep monitoring, but so far very satisfied with the resolution. Just wanted to close the loop and thank everyone for the helpful advice. Catching this early definitely prevented more expensive repairs down the road.