Hi,
I have recently purchased a 2008 Continental GT Speed.
After a week or so the low battery warning light appeared and I was advised that the main battery in the boot (LH side) needed replacing, the smaller battery was fine.
The place I bought the vehicle from agreed to fit a new AGM battery and it was fine for a few days.
However, the warning light has appeared again despite the car being used daily.
Has anyone experienced this before, any ideas?

Thank you

 

I should have added that this is the second new battery that it has had in the space of a week, thought there was an issue with the first one so they replaced it.

 

what color of the mesage is - white or orange? there may be battery issue in your fob.

 

I concur.

Johnny

 

Hi,
Thank you both for the replies.
The low battery warning light is orange on the dash, I will get a new battery for the key fob and hopefully that works!
The only fault showing on the scan after the LH battery was replaced was for an oxygen sensor - the garage have ordered and awaiting delivery.

Cheers

Kieran

 

Hello @KieranB ,
Please let us know the outcome after changing the fob battery.

Johnny

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Hi guys,
So I changed the key fob battery yesterday and and tried the car again this morning.
Same issue, had to open vehicle with the key and start it turning the key anti clockwise.
Although I originally said the Low Battery warning light was orange, apologies, it is actually white!
I'm dropping it back into the garage that fitted the new house battery for further investigation as this is the second new battery.
It always starts off the key no problem - after its been taken for a run it will start off the button for the rest of the day.
However, if I leave it overnight and try next morning I have to use the key to open and start.
Any ideas what could be draining it?
I will let you know what the garage finds.

Thanks

Kieran

 

Hello @KieranB ,
I would verify that the house battery has actually been changed, have a load test performed on said battery, check the date on the battery, anyway to verify that it has been changed twice, or did the shop just put a charge on it and send you on your way, did you visually see a new battery being installed, what brand is it, along with size and proper amperage, it should be an H8.

Being that you have to use the key-blade to unlock the door, it points to a dead house (left) battery, along with the white low battery message, that's why you need to verify it's definitely a new battery along with a load test of said new battery.

As to what could be draining the battery, tell us, are you daily driving the vehicle, if so, how many miles and time each way, do you have a battery tender for the GT Speed, do you have the Ross-Tech VCDS for scanning yourself, can you park the vehicle indoors at night in a dark very quiet place, therefore you can leave passenger front window fully down so that you can stick your head in and listen at the glovebox area, to see if the CD changer or the NAV DVD drive is constantly running, another member here found one of them to be the cause of their battery drain, I can not recall which one at the moment, but I will search for the thread.


Edit: I forgot the explanation for the dark setting for parking, so, as you approach the vehicle as parked, take notice if any interior lighting is illuminated, even the two yellowish gold LED'S that shine down form the rear view mirror, as with the vehicle alarmed and asleep, with the keyfob in the house, and the interior motion detector turned off, those two lights shining down should not be on, if they are, the vehicle is not fully asleep.

Note:
If you do the window down to listen to the drives, be sure to arm the vehicle when parking, then leave the keyfob far away from the vehicle (in the house), do not touch the door handles or trunk at all, you want to vehicle to be as it is sleeping, so 30 minutes or so after you park it, prior to parking it, you may also want to go into the Infotainment head unit menu and turn off the interior motion detector, it is the "SET UP" button, then "ALARM SYSTEM" then "INTERIOR", if you don't, be sure to stick your head in very slowly, as the interior motion detector will set off the alarm.

Johnny

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SET UP. .

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ALARM SYSTEM. .

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INTERIOR MOTION DETECTOR. .

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Hi Johnny,
Thank you so much for the detailed response.
It was definitely a new battery that was installed, again I will get them to test the battery and check the date.
On average it is probably only being driven 30-40 minutes per day, as it is being used daily I haven't been using the tenderer (I do have a CTEK)
I will try all the other tests you suggested, I will drop it back to the garage at the weekend, they will scan and see what they can find.
Thanks again.
Kieran

 

@KieranB ,
If you do the test for the CD changer/NAV DVD drive, be sure to open the glovebox after you stick your head in, if either are running, you would hear it, but also see it by the buttons being illuminated red.

Also check out post number 21 by @redstr3842 in the linked thread below, he had a bad KESSY module, he had a parasitic draw of 6 amps, after the repair or replacement of the KESSY module, he still had a 0.50 amp draw, which turned out to be the glovebox light, now of course only the glovebox light would not be your issue alone, but all things add up, so worth a check.

I would use the clamp amp meter to check which main feed is having the draw, then start pulling and replacing fuses one at a time to find the item creating said draw at respective fuse-box.

Also, I just went out and tested the automatic shutdown of all interior lighting along with boot lighting, I left both doors wide open, the bootlid up, keyfob in the house, I meant to check on it in 10 minutes, but I received a phone call and lost track of time, but I can confirm that after 26 minutes all interior lighting along with the boot were out, this will allow you to get a true amperage draw without the interior or boot lighting interfering with the actual reading of the parasitic draw, nor having to pull any fuses for same that might interfere with possible power supply to other items.

https://www.6speedonline.com/forums/...weeks-why.html

Johnny

 

It wasn't an easy process to get to the root of the battery drain, however hopefully sorted now.
The battery was attached to a gauge to monitor voltage drop, and after disconnecting many components and the dash, the garage traced it as 2 faults in the circuit.
After removing the infotainment system there was a greatly reduced voltage drop, however after a few days, there was still a small drain.
This was the phone control unit, both have been replaced and been fine so far.
Thanks for all the help

 

@KieranB ,
Thank you for the update !

Johnny