2019 Tahoe 5.3 LT Battery Drain

[2019Tahoe]

Cold air puts moisture in weird places. Winters seem to enjoy the havoc.

Although the battery cables are known to corrode from the inside out, this problem sounds more like frost forming underneath the engine fuse block and creating the new connection.

Remove the fuse block and check underneath. Consider replacing the battery cable, if you haven’t already.

Are you taking about the fuse block located on the battery or the actual box that has all the fuses located on the drivers side?

 

[RoadTrip]

Are you taking about the fuse block located on the battery or the actual box that has all the fuses located on the drivers side?

Driver’s side.

 

[blondie70]

How does one pull that fusebox apart ???

 

[rdefeo]

Same thing is happening to me (2018 Tahoe Premier). While at home, I noticed that my phone would gain/lose a connection periodically. But it happened so quick I didn't know what it was - the car "waking up" could be the culprit. Temps have been below 30F and my battery died. It died again after a recharge and I figured it was time to replace it since it's been 6+ years. New battery died after the first day, but it's possible that it wasn't fully charged to begin with? (Although that seems unlikely). I have not changed the location of the key fob when it's been inside, but will try to keep it further away from the vehicle. I may also try to check under the fuse box, but I can't see how moisture/ice would get there. While it has been cold, there hasn't been any recent precipitation. Keeping a jump pack in my car for now...

 

[fozzi58]

Cold air puts moisture in weird places. Winters seem to enjoy the havoc.

Although the battery cables are known to corrode from the inside out, this problem sounds more like frost forming underneath the engine fuse block and creating the new connection.

Remove the fuse block and check underneath. Consider replacing the battery cable, if you haven’t already.

Completely agree with @RoadTrip but I would add 2 ground wires anyway just to be safe. Using some high quality 8 guage wire (Oxygen free copper (OFC) over copper covered aluminum (CCA)) add a ground wire from battery terminal to the body and one from the engine block to the body - preferably 2 different spots. You can use an alternator anchor bolt or something for the engine to body ground. Just make sure it's metal to metal.

How does one pull that fusebox apart ???

Google is a free service but here's a youtube vid on a silverado. Same principles....

 

[Montana _Tahoe]

Completely agree with @RoadTrip but I would add 2 ground wires anyway just to be safe. Using some high quality 8 guage wire (Oxygen free copper (OFC) over copper covered aluminum (CCA)) add a ground wire from battery terminal to the body and one from the engine block to the body - preferably 2 different spots. You can use an alternator anchor bolt or something for the engine to body ground. Just make sure it's metal to metal.


Google is a free service but here's a youtube vid on a silverado. Same principles....

Let me ask you this... Did you buy your truck from a Buy here pay here dealer? If so look for the GPS tracker and the kill switch they install along with it. I had one on my Tahoe that killed my battery every 3 days if I wasn't driving it. If the kill switch was wired in incorrectly it will put a constant drain on the battery.

 

[Roux]

I have a 2019 Tahoe 5.3 LT. When the truck is off and the temperature outside 30° and below the steering wheel lights light up and then the infotainment screen illumitaes grey and then goes out. 3 minutes later the same thing, steering wheel lights up then the radio screen grey and then goes out. The colder it gets the more it happens. This eventually continues all night till the battery is dead. I have to start the truck every 2 hours or the battery dies. When its warm its fine no issues all summer. As soon as the temp drops below freezing this happens. Help is appreciated

Are you getting these batteries from the same place? Maybe a bad batch? I had a similar situation, but mine ended up being several bad cells within the battery. (had to crank the Yukon every 2 days to remain charged). Would insulating the battery help?