If you haven't already seen it, this link will take you to an article in today's GM Authority email that you'll probably be interested in. https://www.google.com/amp/s/gmauthority.com/blog/2021/12/gm-releases-valve-lifter-service-update-for-v8-engines/amp/
I'm sure the more knowledgeable amongst the forum members will respond, but when I hear about rough idle issues I think things like dirty injectors or a bad spark plug, but I'm no automotive mechanic.
I wonder if the tech who installed the lift performed the steering recalibration that's an integral part of the lift installation. If so, I'd think it would be annotated on the service paperwork. I don't know how not doing the steering recalibration would manifest itself, but it's something worth checking on - just a thought.
As mentioned by a previous poster, if you still have the ball hitch stinger in the receiver, that could be what the sensors are sensing. However, if you've removed it, and regardless of what may or may not light up on the dash, does the rear park assist actually not work when you're backing up to an object?
On the accessories page for my GM account, the wiring harness is described as being a Baja Designs harness, just as the lamps and brackets are. They may be a better option, such as the GM upfitter switches, but I assumed that the Baja Designs harness would best support their lights, but if Baja Designs outsourced their harness and just put their name on it, then maybe not. https://accessories.chevrolet.com/product/wire-harness-by-baja-designs-associated-accessories-19369744?model=Silverado 1500&modelId=491&bodyId=22&body=Crew Cab Pickup&wheelId=651&wheel=Short Box&trimId=430&trim=LT&driveId=8&drive=4WD&engineId=2059&engine=5.3L V8 GAS&bodyNumDoors=5&year=2020&make=Chevrolet&categoryId=171502
I visited their website months ago, and while you're correct that it's another option (I misspoke when I said there wasn't another option), at $750 plus tax it's not an option for me.
Good to hear it works for you, but for some of us, as in my 2020 Silverado LT, wireless AA is not an option, not due to my phone's capabilities, but because the vehicle doesn't support it. For people like me getting one of the newly introduced wireless AA dongles is the only option if I want wireless AA.
For the Silverado the Baja pillar lights on the GM accessories page come with the hood hinge brackets. I'm assuming that's also the case for the Sierra. If ordering from the GM accessory site you do need to order the separate Baja wiring harness as well.
This is normal, and like already mentioned it sounds like relays, ventilation components actuating. Mine does it at just under sixty seconds after shut off. I do not think it has anything to do with the seat as I have the base power seat without the fancy ejection seat option.
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