Battery dies overnight

[TxSam]

Just to follow-up - I do believe the slightly loose negative terminal was the likely culprit. After cleaning and re-installing and a 24 hr recharge, the Yukon seems fine. Even seems to be 'turning over' faster when starting. I think it may have been an issue all along, but we had no way of knowing until it didn't want to turn-over. Seems hard to believe after 5 months and 10k miles though.

Anyway, I would suggest to other owners who may have had a Yukon or Tahoe that sat waiting a chip(s) to double-check the negatively battery terminal for cleanliness and proper torque.

Well - After a night in the garage, the next morning it wouldn't start again. Did some DMM measurements, voltage was around 11.0VDC on the battery, went ahead and did the battery charger for a while. Voltage up to 12.6 VDC. Started it up, measured the voltage while running, alternator seems to be working watched the voltage climb from 12.6 to about 14.1 VDC and stabilize there. Turn vehicle off. Voltage dropped back down to around 12.6 which seems normal to me. Checked the voltage next morning before starting. Voltage down to 12.0. Didn't start or drive, checked the next morning, voltage down to 11.8. My only guess right now is that either something is running the battery down over time or the battery has a weak cell that's just loosing charge overtime. I am not very well educated on the design/composition of AGM batteries so I'm not sure if my theory is accurate. Anyway, looks like a dealer visit for me.

P.S. I apologize if this was a hi-jack of this thread - I just figured I would add my issues and info to an existing thread concerning the battery issue and keep the info somewhat consolidated for future reference.

 

[jforb]

I would not be surprised if it needs a new battery.

 

[TxSam]

I would not be surprised if it needs a new battery.

Just an update to keep the thread current. Ended up at dealer. Technician identified the battery had a bad cell and they installed a new battery. The dealer has doubts about it being a faulty battery only and think that something has been draining it over time and the charge and discharge cycles compromised the battery. I'm not so sure that is the case and lean toward it just being a bad battery, but if there is something draining the battery over time, I'm sure we'll find out. Everything seems fine for now though.

 

[OP2021Tahoe]

Hi...I know this is an older thread but figured I would post the below link in case anyone needs help. This same issue happened to us the week before christmas, 2021 Tahoe sat overnight and battery was completely dead the next day. The only thing I briefly noticed was the OTA was acting bizarre, and we kept getting a pause/resume message on the screen. Happened exactly as described in this link. I brought the vehicle to the deal last week and the replaced the battery.

https://gmauthority.com/blog/2022/07/chevy-tahoe-and-suburban-gmc-yukon-get-customer-satisfaction-program-for-ota-battery-drain/amp/