Starting issues when hot w219 320 cdi

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Carrgti

New Member
Joined
Mar 29, 2021
Messages
1
Location
Barnard castle
Car
2009 cls w219 329 cdi
Hi guys,
So my car has been a slow starter for a while now but it has been into a garage to look at, the main issue was after the car had been running for a while if you pulled over it would fail to start when hot.
So it's had a new turbo,new injector seals,new lambda senson ,full service new filters etc etc.
And now the only code that is coming up is po9003 and it says voltage issue.
The battery is holding charge but as soon as you crank it the voltage drastically drops. The alternator is putting power back once its running however.
On looking into it the mechanic has told me there's a good chance its the battery control module.

HOWEVER absolutely every Google post that shows you were it is, every parts supplier I have rang have said its in the boot at the left, we have completely stripped all the boot trim and taken the back seat out but we cannot find it anywhere??? Does anybody have a location or even better a picture in the location
 
Assuming it has one is it not connected to the battery positive terminal?
 

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