Looking for some suggestions on a multiple dead battery issue on a 2020 Sierra at4 (5.3l). Over the past 6 months I have had roughly 6 to 7 times the battery looses its charge and will not start the truck. The battery was checked twice and tested fine, on the 3rd time it was replaced, I didn’t bring it in the first time as I figured it was an anomaly. Since the new battery it has not started 3x. On the second time with no start they had already diagnosed a bad on star module that was just waiting to arrive for the dealer to replace (this was roughly 3 weeks ago). On Monday the truck would not start (it started Sunday with no problems), I could not jump start it with another car, a jump pack, or the tow truck. The dealer currently has the truck (they charged the battery and was able to start it). Currently there is no draw showing that would cause the battery to drain. They are keeping it hooked up and monitoring now I am out of warranty (yes I drive a lot for work), and just looking for anything that can help point in the right direction. The dealer has been great in trying to resolve the issue, but we are both confused as to what could cause this issue. Each time the battery has died it was been in the driveway at home. Not sure if it makes a difference, but the cylinder head was replaced due to a DFM issue
I can live with the “truck” feel, but there is a huge difference between The original ride of the truck and now. I do believe the issue started at the first tire rotation, so tire kingdom will have to keep balancing them till they get it right.
I have a 2020 gmc at4 with the 20” rim combo. Currently sitting at 22,000 miles and my ride quality is getting worse. My dealer said it was unbalanced tires (had them balanced) and that did not solve the problem. i understand this is a truck and won’t have a perfect ride, but it feels like I’m driving on rumble strips , constant shaking, and a lot of side to side motion. I also recently had a failed lifter and they replaced the lifters and cylinder head. Not sure if this could cause the shaking I am feeling. i plan to try another dealer, but looking for suggestions first.
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