thebull55

Very interesting. I was not aware of that. The local GMC stealer is very easy to deal with. I think I’ll stop by and have them hook it up. Thanks for the info. ?

The Duracell is on my short list for sure. The 15.5 was with only the radio on. I thought that seemed a little high. I think I will listen to chem_man and see if I can get it tested, just to make sure. Just don't want to go into winter unsure. Thanks!

I have a 2011 Sierra SL with a 4.8L. Battery age is unknown as it was there when I bought the truck. Over the weekend we were moving our kid into their dorm and I sat out front with hazards on and nothing else. When I went to leave battery didn't have enough umph to start they truck. Jumped it and started right up and was fine stopping a couple times on the way home. I let the truck sit overnight and then checked the battery. It read 13.3V and then 15.5V after starting the truck. No problems since. Was this a fluke or is the battery giving a warning shot before winter? I will probably just replace the battery before winter, but just wanted to know if I am missing something. Thanks!

With the 2011 it has to be done at the dealership. Just my luck.

I have a 2011 GMC 1500 SE with an aftermarket autostart (so I was told when I bought it). Over the weekend, they fob stopped unlocking or locking the doors. It just clicks in the engine bay, sounds like clicking under the fuse box. The autostart works, but no doors. I only have one fob. I replaced the battery in the fob, checked the fuses and the locks work fine with the door buttons. Any idea where to go from here?