Hi

Ive noticed my start stop system isnt working and car showing high power consumption when i switch the start stop system to on. Doing so even when no air con is on etc.

Display even said engine needed to be running evening though it was!

Im guessing battery is on its way out?

Has someone in the past fitted a "stop start defeat device" ? that tricks the ecu into seeing a lower voltage that inhibits stop start ?

3 hours ago, Crucian said:

Has someone in the past fitted a "stop start defeat device" ? that tricks the ecu into seeing a lower voltage that inhibits stop start ?

You can disable it with vcds

8 hours ago, chrisski said:

Hi

Ive noticed my start stop system isnt working and car showing high power consumption when i switch the start stop system to on. Doing so even when no air con is on etc.

Display even said engine needed to be running evening though it was!

Im guessing battery is on its way out?

How old is the battery?

@chrisski battery will need coding in , in order for the car to charge it properly. My original battery (AGM) on my TDI was 9years old when it gave up, I have VCDs so swap was easy and battery cost £165 from Halfords for a nice new Yuasa.

Edited Monday at 17:525 days by paulski

On 06/07/2026 at 01:18, ords said:

How old is the battery?

Not sure. Havemnt replaced the battery since ive had the car so think its the original. Did take about 10secs to start car after work today.

8 hours ago, chrisski said:

Not sure. Havemnt replaced the battery since ive had the car so think its the original. Did take about 10secs to start car after work today.

How old is the car?

There is usually a date stamp on the top face of the battery negative terminal, particularly if the battery is original.

Format is WW/YY - so March 2016 would be something like 10/16.

On 05/07/2026 at 21:57, nickytheshaft said:

You can disable it with vcds

Thanx