f355spider
$50 Site Donor 2025
Batteries are finicky products. Even good quality, well known brands have occasional premature failures, which are documented here.
Under 6 Volts on my VW GTI Battery
- Thread starter ET16
- Start date
Can't you jump start it from another vehicle or one of those jump starter packs? Or is the battery too depleted for this to work?
Time to delve into the egg money...It's bad.
f355spider
$50 Site Donor 2025
Last evening I was telling the kids next door...when I was growing up, eggs and toilet paper were so plentiful we went out at night and threw at the neighbor's house for fun!
As long as the battery does not overheat, that should be OK.
Way back, long ago, wives took their chicken's eggs to sell at the general store for extra money. That's what I actually meant by "egg money".
My LR2 H7 AGM battery died last Jan. It too has voltage less than 10 volts. Set it on a charger for 2 days and it does not go beyond 11 volts. It is still under warranty but had to wait for it to be tested. The battery failed the test, and I got a new one.
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Been there. My wife’s 24 battery completely crapped out setting at the Detroit airport in less than a week. No warning, nothing! AAA got us going and the dealer replaced it. What’s worrisome is the tech told me that they have new cars coming off the car haulers with bad batteries. Apparently there’s little pride taken in battery manufacturing now days. I’m watching this battery like a hawk and have jump packs in all our cars now.
Did you happen to confirm AGM or EFB? If it's an AGM, there will be no sense in leaving it on the charger as it probably won't get above 11-11.5 volts. The battery is damaged/failed internally and no lengthy amount of charging will bring it back to fully usable voltage that will allow you to start and drive it without causing issue in one of the multitude of control modules, if not shut down while underway due to low voltage in one or more of those modules. If your dealer is worth their weight, they will have a tech come out and drop a new battery in it for you or provide a tow.
Most VW batteries are EFB, but pretty sure a GTI could have either.
My EFB clearly said EFB on it, I believe the AGMs do as well.
FWIW VW says an AGM in the engine compartment MUST have a battery cover.
I would not try to recover a battery that was under warranty personally.
My EFB clearly said EFB on it, I believe the AGMs do as well.
FWIW VW says an AGM in the engine compartment MUST have a battery cover.
I would not try to recover a battery that was under warranty personally.
If it's VW labeled OEM it will. VW seems to be trying to phase out EFBs recently and going AGM for start/stop. My local dealer does not even keep any EFBs in stock anymore.
I'm at 11.83V now, but battery tester says replace.
Mine is AGM (Varta).
Probably, my Tiguan did in a way. Not a code really but a serial number , capacity and battery type. AGM is “fleece” in VW world. Under warranty the dealer should set this, but I did it in VCDS. You can use OBDeleven as well. Out of warranty my dealer wanted $130 for about a minute of effort. That’s more than the cost of OBDeleven!
The change isn’t “required” but it tells the computer that you have a new battery and the type will set the charging voltage. It will still work without making any changes.
This hasn't really been a VW thing for about a decade.
And even back then, the car would work "fine" without coding.
I think this is probably best. I got the car started and my battery tester now says "good, recharge," but the car is all wonky with multiple errors coming up. I'm not sure I want to drive it.
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