MajorCommonElectrical

Cupra Formentor: 12V battery drain — car dead after sitting (worst on eHybrid VZe)

12V battery drain — car dead after sitting (worst on eHybrid VZe) is a common electrical fault on the Cupra Formentor on the 2022 onward cars, and we rate it major. Putting it right costs $300 to $900 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 8 documented faults on the Cupra Formentor.

Vehicle: Cupra Formentor
Years: 2022 onward
System: Electrical

This page covers the Cupra Formentor as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Cupra Formentor faults8 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the 12V battery yet. We would rather show none than show a picture of a different part.

What goes wrong

Formentor owners report flat 12V batteries after the car sits for only a few days, with the eHybrid plug-in especially affected because its battery-management software can over-discharge the 12V system; Cupra has issued battery-management software updates for exactly this complaint. A flat 12V battery locks you out and prevents starting even when the hybrid pack is charged. Cars that repeatedly go flat and haven't had the update or a new battery will keep doing it.

What you would notice

Car dead or won't unlock after sitting several days
Repeated jump-starts needed
Warning messages about the 12V system
Start-stop system inactive

How to check it

Where to look. 12V battery in the engine bay; battery-management software

Ask directly whether the car has ever gone flat and whether the 12V battery has been replaced — look for a dated sticker on the battery.
Ask a Cupra dealer whether battery-management software updates are outstanding for the VIN.
On an eHybrid, ask if the owner kept a trickle charger connected, which is a tell.

Parts involved: 12V battery.

What it costs to put right

$300 to $900 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the 12V battery ever gone flat, and how often is the car driven?”
“Has the battery-management software update been applied?”

Now check the Cupra Formentor you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

SEATCUPRA.NET — 'Formentor battery drain' thread
SEATCUPRA.NET — 'Car Dead!' thread
Speak EV — 'Cupra Low Voltage battery discharged' thread

Cupra Formentor buyer questions

Is 12v battery drain — car dead after sitting (worst on ehybrid vze) serious on a Cupra Formentor?

We rate it major and common on the Cupra Formentor. Formentor owners report flat 12V batteries after the car sits for only a few days, with the eHybrid plug-in especially affected because its battery-management software can over-discharge the 12V system; Cupra has issued battery-management software updates for exactly this complaint. A flat 12V battery locks you out and prevents starting even when the hybrid pack is charged. Cars that repeatedly go flat and haven't had the update or a new battery will keep doing it.

How much does it cost to fix on a Cupra Formentor?

$300 to $900 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Cupra Formentor years are affected?

Our research records this fault on the 2022 onward Cupra Formentor. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Ask directly whether the car has ever gone flat and whether the 12V battery has been replaced — look for a dated sticker on the battery. Ask a Cupra dealer whether battery-management software updates are outstanding for the VIN. On an eHybrid, ask if the owner kept a trickle charger connected, which is a tell. Look here: 12V battery in the engine bay; battery-management software