How long had the car been off..?? 12.6 is a fully charged battery, I bet this is dropping overnight, as you turn on the ignition, the gearbox ECU reads the voltage as low and chucks the fault up.... ?? Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I just charged it other day. As I said before, within a couple weeks, it will be down 50% charged. Even after long runs, it doesn't increase the charge.

Probably the battery then, it's certainly the cheapest thing to try first anyway...  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Exactly, process of elimination. Cheapest thing first.

even cheaper is a system discharge / battery reset.

Nothing to loose before you buy a battery.

Then yes a battery would be next cheapest thing to try
. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

I was getting similar readings to that, but as Haylands says it's probably losing some power overnight, and once they get weak and you turn the key its game over as the voltage drops right down.

How do you do the system reset and discharge?

It's in the WIKI, just a battery disconnection procedure, worth a try but don't hold your breath...! Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I think I've tried that. Taking battery leads off, then touching them together?

Just got old battery out. There was a label on the breather pipe on old battery dated 18/11/2010

Oh well new battery in, no difference.

Also I checked new battery charge percentage it was 70%. After I fitted it, I did the battery replacement on diagnostic tool. After that I put charger back on and it was 50%. Getting a replacement tomorrow to see if its the new battery.

Got new battery today. Still the same message. Also noticed not going into low box.

Lo box working, didn't do procedure correctly.

Shawser1203 wrote:

No fault codes came up.