I had the issue with the auto stop/start not working about 1 1/2 years ago. I took it to the dealer. They found that the battery had a bad cell. They replaced the battery under warranty and it has been functional ever since.
The Onstar wifi in your truck uses a cellular modem to connect to a ATT LTE. Your truck also has a router to send the internet signal over wifi to whatever you connect to it. After the 3 months trial, your ATT data plan was discontinued. If you connect your laptop to your truck wifi now, you will get nothing. In THEORY, your truck will get a better cellular signal than your phone will. If you get a data plan with ATT, then you MAY have a signal in the truck when your phone has a weak signal. There are different data plans, I think, so you could use up all of your data plan using Waze. Waze is data intensive because it is sending your location to the cloud in real time. Do you need to use Waze? Are you using it for navigation, or are you always letting others know where you are when you are driving?
Another interesting article - this one on CNN - with some facts about the record high gas prices. https://www.cnn.com/2022/03/10/politics/record-gas-prices-wont-be-solved-by-drilling-more-oil-climate/index.html Here is a snippet for why the US imports crude oil: There's also the fact that the US consumes a different kind of oil than it produces. McNally likened the kind of light crude the US produces to champagne, and the heavy crude it imports to coffee. Importantly, US oil refineries are built to refine this "heavy and gunky" imported crude -- akin to separating out coffee grounds, McNally said.
Check this youtube video. This is for the Chevy performance exhaust on a 2019 Silverado. The part number is 84173601, which was replaced by 84964738. This kit has the Chevy logo on the exhaust kit. The GMC version of the same kit is 84173608 which was replaced by 84964742. Same exhaust, just different exhaust tips.
GM, like Apple, has their software as a closed system, meaning that it can't/shouldn't be altered by unauthorized parties. Apple iOS used to be hacked, called "jail breaking", by hackers to turn on functionality that was in the operating system but not turned on by Apple. When Apple sends out a new update for iOS, it wipes out the jail break. In a similar sense, GM does not know that additional functionality has been added to your truck. They only know what they know by what is assigned to your VIN. So when they reflashed your module, it was what they have marked down to your VIN. When someone gets official GM accessories added by the dealer, and it involves flashing some software, I think it gets added to your VIN so that in the future, any reflashes should have that change included. IMO - when MVI updates the module for NAV, they should either "lock" the change, or let GM know that the change occurred so that it can be added to your VIN. This would avoid future issues with software updates or reflashes.
If you look closely at the black trim piece under the bumper, you will see what looks like caps/plugs on the front side of the trim. Hard to really see in the picture that is posted currently. There was another picture that had a close up of the bumper and trim where the OP circled the holes.
As a former Quadrasteer owner, I did some searching. From what I have found, the OEM bellows part is 88963416. I checked a lot of the GM parts web sites and they all say the part is discontinued. I did find this rear steering kit on ebay when searching for quadrasteer - https://www.ebay.com/itm/273792264979?epid=9031307724&hash=item3fbf4a6b13:g:ZnoAAOSwzlRcpS9S Maybe you could contact the seller and see if they could sell you just the bellows. Good Luck.
Could be your battery is on it's way out. That would be the first thing I would check. Everything on these trucks depend on the voltages being correct. Fluctuations in voltages can cause certain things to malfunction and/or codes to appear.
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