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diesel Dave



Member Since: 14 Aug 2015
Location: Stockport
Posts: 442

England 2015 Range Rover Autobiography SDV8 Loire Blue

Heyloft wrote:
Yep got that it’s battery related

The main battery is 98% charged and 13.8v so I’m happy with that.

The Aux battery after 2 hrs of charge is 10% charged and 10.2v. That’s just not right.

I don’t want to fix it, it’s under warranty, I just want to tell the dealer that they’re talking sh*te and it’s the aux battery not the main one, rather than them blaming the main starting battery again. I’m evidence gathering, I guess.


Charge your aux battery overnight, if it’s not now well over 12 volts it’s useless and the stop start will not work.

Tell the dealer your results, also for info the aux battery is used to keep the system stable on a restart, IE it does not start the engine, the main battery does, it just stops other systems dropping below a voltage threshold to stop unwanted fault codes.
Once either battery fails the stop start will be disabled. The dealer will need to fit a new aux battery then tell the system it has been fitted via a quick plug in of their diagnostic equipment. Even basic equipment can do this so there should be no excuse. Hope you get sorted Thumbs Up

Post #580098 17th Jan 2021 11:33am
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