2016 Toyota Tundra Battery Goes Dead After Not Driving It For A Week > WHY?

I discovered that it wasn't a bad battery but the truck's electrical system is draining the battery from not being driven for a few days to a week or so, WHY ?

 

You've gotta parasitic drain.

 

If you live in a hot place, you will go through batteries fairly quickly. I went through similar issues when I first got my 2nd gen and after a week at the dealer with some Texan techs, and overnight engineers from Japan they got it mostly figured out to the point where it stopped killing batteries, just because I didn't drive it for 15 minutes.

 

There isn't any aftermarket goods in or on the truck. The battery is new (2 months old). I did replace the battery a second time after this battery drain started thinking it might have a dead cell, I guess it wasn't the battery. What was the fix that the Texan Techs came up with?

 

Thanks for sharing your info. What did the Texan Techs find and what was the fix?

@blackdemon_tt

 

They never shared from what I remember. I'll look up the details on the maintenance records and share. From what I remember it was just diagnostics and repair and that was it.

 

sometimes caused by a bad diode in the alternator...........

 

After logging into the service records site, I've noticed alot of changes to what was there before. At first there were 0 records, now there are a few to which I remember there were a lot more, all my battery visits are now gone. Either way. They claimed there was 2 DTC codes and was the MAF sensor and another one that wasn't reported. I'm sure there was another record isolating the electrical issue, but this is the only one I have on here. I will look into my paper records, since I'm positive I have it in some folder somewhere in my garage. It's like my 7th move since then so I have stuff everywhere...

 

Thanks for the help.