Serious electrical issue on 2021 Z71. Anyone had this?

[Donnation]

I was out of town for a week and came home to a completely dead battery in my 2021 Tahoe. After having it towed in, the dealer says a battery cell went bad and that it needed to be replaced. They put a new battery in it and I drove it home.

The next morning I try to start it and the dash lights up with all of these warnings. It won’t start and the dash won’t shut off. It’s got power but won’t start at all. I tow it back to the dealer. They are now telling me there is something wrong with one of the “modules” but don’t know which one or what it is. They’ve had it for 4 days now and nothing and their last response to me was that they are still testing modules and searching for the issue.

Has anyone ran across this? I’m starting to worry here. Thank you!

 

[K5-Z71]

Their first resolution was total BS, they were hoping the problem just wouldn't show back up. I would be skeptical of this shop.

The bad battery cell didn't cause the battery to go dead. The battery going dead is what caused the cell to fail. - Common sense for any tech...

They are on the right track with suspecting one of the BCM's. I would guess its taking forever because they are using outside tech support

 

[bam01]

I was out of town for a week and came home to a completely dead battery in my 2021 Tahoe. After having it towed in, the dealer says a battery cell went bad and that it needed to be replaced. They put a new battery in it and I drove it home.

The next morning I try to start it and the dash lights up with all of these warnings. It won’t start and the dash won’t shut off. It’s got power but won’t start at all. I tow it back to the dealer. They are now telling me there is something wrong with one of the “modules” but don’t know which one or what it is. They’ve had it for 4 days now and nothing and their last response to me was that they are still testing modules and searching for the issue.

Has anyone ran across this? I’m starting to worry here. Thank you!

I am having a similar issue. Left it for 2 days and came back to a dead battery. Happened once last year too. Both times it was while on vacation, perhaps being left in the heat for two days, or maybe having the spare set of keys left in the vehicle? I haven’t asked the dealer about it yet…

 

[salisburyv]

that's probably exactly it. the fob communicates with the computers in the truck, so if they're all talking to each other and the battery doesn't get charged from driving.... Viola'

when i was a writer, when those types of fobs came out, i used to tell my customers if they garage the car and its attached to the house store the key as far away as possible, in a coffee can or something metal to block the signal. because it made the computers in the car keep running. Do you know how hard it was to explain to a 70 yr old lady about the key and the car talking to each other?? lol