VW Taos Auto-Stop Failure Causing Random Shutdowns

I had a similar issue with my 2019 VW Tiguan. As someone with intermediate car repair experience, I can relate to your automatic restart concerns. The symptoms were nearly identical, unusual engine shutdowns and warning lights. Initially thought it was the starter motor, but after a workshop diagnosis, they found the car battery was severely discharged despite appearing fine on basic tests. The workshop performed: Full battery diagnostic test, System voltage check, Replacement of the main battery, Reset of the engine start management system Total cost was 290€, including parts and labor. The issue completely resolved after the repair. Key points learned: Modern start-stop systems are highly sensitive to battery condition, Regular battery checks are crucial, Warning lights often appear before complete failure Before suggesting more specific solutions, could you share: Current mileage, When the issue first started, Any recent electrical upgrades, Whether the problem occurs more frequently in specific conditions, Complete error codes from your diagnostic scan This information would help determine if your situation matches what I experienced with my Tiguan.

Last service was at 142000km and issue started shortly after. The error codes from my OBD scan are P0513 and P0562, which seem consistent with others experiencing similar idle stop system problems. The workshop advisor initially suspected a starter motor malfunction, but after reading these responses, Im now thinking the battery management system might be the culprit. Recently noticed the eco mode sometimes disables itself, possibly connected to the engine stalling incidents. The battery issue theory makes sense since these problems started appearing more frequently during cold starts. Would a battery replacement definitely solve the unusual shutdowns, or should I push for a complete electrical system diagnostic first? The current battery is still original equipment from 2021.

Based on your error codes P0513 and P0562, this definitely aligns with my Tiguan experience. These codes typically indicate voltage issues, which matches exactly what I encountered before my repair. After getting my car battery replaced and systems reset, the unusual engine stalling completely stopped. The eco mode stayed consistently engaged without out of nowhere deactivating. The error codes you mentioned are classic indicators of a failing battery management system, often triggered by a weakening battery. Given that your battery is the original from 2021, and considering the high mileage, a replacement is likely needed. However, I would still recommend a full electrical diagnostic first. In my case, the workshop found that the constant start-stop cycling had accelerated battery wear beyond normal expectations. Important findings from my repair: Battery voltage was fluctuating under start-stop loads, Engine stalling occurred more frequently in cold weather, Eco mode inconsistency was directly linked to low voltage, New battery resolved all symptoms including warning lights The complete diagnostic before replacement helped confirm there were no underlying issues with the alternator or starter motor. This extra step saved potential complications later.

Thanks for the detailed information about your Tiguan repair experience. These voltage-related symptoms definitely sound similar to what Im experiencing. After tracking the engine start problems more closely, Ive noticed the issues are most frequent during morning cold starts, which strengthens the battery theory. Ill schedule a complete electrical diagnostic first, then likely proceed with the battery replacement. The increasing frequency of engine stalling and eco mode disabling matches what you described with your vehicle. Its reassuring to know a new battery solved these exact symptoms, especially the unusual shutdowns. The start-stop system issues have become more annoying lately, so Ill get this addressed before winter when battery problems typically worsen. Given the high mileage and original battery, replacing it seems like the logical next step after confirming no other electrical problems exist. Really appreciate the thorough explanation about your repair process. The suggested diagnostic-first approach makes perfect sense to avoid any costly misdiagnosis.