1.0 TSI Battery/Turbo Wastegate stuck shut

[simoid]

Car hasn’t been driven for a few weeks, but was totally fine in June and before.

Started it up this week and it had the engine management light on and after a short drive the EPC light came on solid and performance was restricted. Called local VW dealer to ask if there was anything simple it might be after lying dormant. They suggested getting breakdown out if I had any first. So I did. Breakdown assistance discovers battery is gubbed (plenty charge but the resistance in the battery) and there’s a fault code for electronic turbo wastegate stuck shut.

Car is in limp mode as soon as you put more than a throttle on so it’s useless just now (presumably this is once it notices the turbo valve issue)

No room at garages nearby for weeks.

Is it maybe the battery causing all the faults?

Wouldn’t want to change the battery and then VW won’t sort the turbo because I’ve changed the battery and driven it about more to bork it, similarly I wouldn’t want to be without the car for a month then find out it just needed a battery

[TimmyMallett]

I wouldn't be surprised. Low voltage can throw all sorts or weird unconnected errors. Certainly of the wastegate is an electronically controlled actuator.

[SDW2022]

Coincidentally this exact issue has just arisen on my partners 1.0tsi Polo - Undriven for a week or so and now throws EPC Light, Limp Mode & Engine light. Error code seems to relate to the Turbo Actuator 'Position A Overboost Limit Exceeded'. Seems to be a common issue on these engines - car has only done 29K Miles.

It's booked in next week but I may try a new battery first, will keep you posted if I have any luck.

[Belle427]

Had a similar issue on a family members A3 that was parked up a week or two whilst I did some work on it.
I reset the code twice when it came up after a lay up and it didn't return.
May be worth you investing in a cheapish code reader to reset it and monitor it.

[stevemcs]

Its usually the actuator, no doubt revised again - knowing VW. Normally 1 hours work to swap, reset and clear any codes with a roadtest and £300 for the part.

[simoid]

Thanks all! Peculiar that I didn’t have any warnings about the turbo until the dormant period but I suppose there’ll be a reason or it’s just coincidental.

Car is still under warranty thankfully. I’ve left it with VW dealer as I’ll manage without it but it is a pain in the neck.