You have a drain fault, its not magic ...... find it and fix it. In a car as complex as Treg, the start is what data VCDS can give you. The battery history data from VDCS may help, post a full auto scan as a start The next level is start monitoring the drain from the battery and finding what circuit its coming from.. If you cant do that if you dont have the equipment or knowledge then find a friend who does or pay someone to do it for you.

 

That’s my problem except for the door latch fault VCDS never shows any faults, all data is perfect and I checked battery for drain every day for 2 weeks with no drain found , but like I said it can go months before it happens again.

 

 

Thanks, that’s super useful for this new owner 👏

 

Thanks but plastic key broke in lock and wouldn’t open with battery completely flat anyway. I got it open and managed to get screen shots from vcds before my laptop battery also went flat,looks like this happened early morning.

 

Thanks but plastic key broke in lock and wouldn’t open with battery completely flat anyway.

It seems You have one disaster after another. The key should open the door nevertheless...

I don't think I'll be much help in here. If I were You I'd start with plugging in the battery charger. Then clearing all the faults with VCDS and than rescanning them again. Maybe You'll get this way the proper fault code, pointing what is causing battery malfunction.Those You've posted may be mostly related to undervoltage problems, not the damage/short circuit itself.

 

Something in the car is not shutting down properly but it looks like it happens intermittently which makes it hard to troubleshoot. Has any other work been done on the car or modifications made before this problem started ?

The common problems appear to be with the Kessy system / door locks or after market radio mods but many other possibilities exist. Get a wiring diagram and start working through each fuse trying to find the drain when the problem occurs. Get a clamp on amp meter and check the car shuts down correctly when parked, I believe it may take 15 minutes to fully shut down. When it does not shutdown properly then you can start looking for the drain via the fuses

 

Also don't keep your key anywhere near the locked car as the car and key keep talking to each other.

 

I have to crawl under and connect jump lead to starter to let me unlock car

😂
I guess adding a pigtail to the jumper posts in the engine bay and tucking it near your front grille would be too convenient

 

You're dealing with a real head-scratcher. Random battery drains can be a pain, especially when they leave you locked out of your own car!
Since you've already replaced the battery and the driver's door actuator, it might be worth checking for any other electrical issues that could be causing the drain. Sometimes it's a faulty module or a short circuit somewhere in the system.
Given that you've had VAGCOM on it recently and found no faults, it might be a bit tricky to pinpoint the exact cause. But if this keeps happening, it might be worth taking it to a professional auto electrician who can do a more thorough diagnosis.

 

Identifying the offending circuit requires a DVOM, youtube, and 15min max.... 30min if you drink while doing it.

 

Thanks everyone, it was fine again today and normally will be for another 4-6weeks , I’ve made an emergency bonnet release cable for next time.it is a bit of a pain carrying around a booster pack when you park car overnight somewhere. Tried auto electricians but there’s no fault and no drain until it happens then it’s fine after I get it started, just wondered if there were any common problems that could drain it so quickly.

 

I have had a similar problem where the battery drained overnight for no apparent reason, VCDS scan run after recharge of battery did not provide answer.
A possible explanation in my case, is that most of my use are short trips of 5 km or less, giving insufficient time for full recharge, although alternator output is around 14v. I have instituted a 6 weekly overnight recharge regime to compensate.
When this first happened, with a almost new quality battery I performed extensive checks on every circuit, but could not identify any problems. Since instituting the regularly scheduled charge program i have not had a re-occurrence.

 

As already directed by @rgh0 above, pull the history file and analyze it to get a better idea of what's happening.

 

I just made a big battery post in reply to someone else. Short version is install a better battery like Odyssey.

Worked wonders in my V10.

 

How about actually giving a link to your all knowing post rather than being a smart a

 

What makes you think I'm going to go out of my way to help you after that kind of a comment? Learn how to use the forum functions as I've given you plenty of hints... I'm not your secretary.

 

Pull the bulb out of your engine compartment , under the hood. Probably the switch is bad and your car computer is not reading that it's off...