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Jan 21, 2026
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Hi,

I have had my 2017 Cupra 300 for 6 months. It was recently in to have the 6th gear synchro replaced. Got the car back yesterday and since then have been having various issues - was wondering if anyone has any ideas on the cause - is it coincidence, or is it related to the gearbox work somehow?

I get a warning that there is a fault with the electronic parking brake. The auto function seems to work fine for a while - even with that warning - but will then stop working. The car at times feels like it is driving with resistance, although I've felt the wheels and they aren't hot as you might expect if anything was binding.

The Auto start-stop also doesn't seem to be working, and this evening at the same time as the auto brake failed after working fine, the auto hold also failed - I have warnings in the vehicle status for all 3 issues.

At the same time, the screen is fairly continuously showing the park assist, and the rear wiper keeps going even though set to the off position - almost like the car thinks it's in reverse?

I spoke to the garage that did the work and they've said I can bring it down for them to look for any codes, but that nothing they did should have an impact (I didn't actually mention anything other than the parking brake issue because the other stuff hadn't started happening).

Has anyone experienced anything similar? Any thoughts would be appreciated!