2019 Tahoe 5.3 LT Battery Drain

2019Tahoe · Jan 20, 2025

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

PPV_2018 · Jan 20, 2025

Something is “waking up” the BCM

when this is happening, is the truck locked, or unlocked

How old is your battery, and is it confirmed good . . . Have you inspected and confirmed clean & tight battery connections, posts, terminals, grounds . . .

Fless · Jan 20, 2025

Move the FOBs across the house and/or use a Faraday bag for them as a test. They may be close enough to wake things up.

2019Tahoe · Jan 20, 2025

PPV_2018 said:
Something is “waking up” the BCM

when this is happening, is the truck locked, or unlocked

How old is your battery, and is it confirmed good . . . Have you inspected and confirmed clean & tight battery connections, posts, terminals, grounds . . .

Battery is brand new as of sunday. This is the 3rd battery ive replaced. It happens when truck is locked and unlocked, and after it sits in the cold untill it happens. Like today my wife took it for a ride to the store got home it sat for 2 hours in 24 degree weather and it was happening every 3minutes

2019Tahoe · Jan 20, 2025

Fless said:
Move the FOBs across the house and/or use a Faraday bag for them as a test. They may be close enough to wake things up.

The key fobs? Really? That can trigger that to happen?

Fless · Jan 20, 2025

Yes, they can. Try it and let us know if things change. Seems repeatable.

2019Tahoe · Jan 21, 2025

Fless said:
Yes, they can. Try it and let us know if things change. Seems repeatable.

I tried it its still doing it. It only happens when the temp is 30 and below? All summer its fine

PPV_2018 · Jan 21, 2025

PPV_2018 said:
Have you inspected and confirmed clean & tight battery connections, posts, terminals, grounds . . .

?

2019Tahoe · Jan 23, 2025

PPV_2018 said:
?

Yes just installed new battery myself everything is clean and tight

RoadTrip · Jan 24, 2025

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.

2019 Tahoe 5.3 LT Battery Drain

2019Tahoe

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PPV_2018

Senior Member

Fless

2019Tahoe

TYF Newbie

2019Tahoe

TYF Newbie

Fless

2019Tahoe

TYF Newbie

PPV_2018

Senior Member

2019Tahoe

TYF Newbie

RoadTrip

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