Are you sure its not the fuel pump priming? Usually happens when you open a door. Sometimes even opening the bed of the truck causes it to occur. If its not that, then i am not sure what you are hearing. Does it do it after you have entered the vehicle and sat in the seat for a minute or when the door opens?
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The MYGMC app indicated that I need to take my 2020 Sierra in for the Brake Control Module recall and when i check with NTHSA's website, there are no recalls for my vehicle. However checking the GMC recall page there is an outstanding recall as of Feb 21. Anyone else have this same recall? Who remote starts their vehicle and gets in and waits more than 5 mins to push the button? GM Program #: N202294820 Date Issued: Feb 21, 2020 Program Title: Brake System Control Module Interaction with the MyBrand App Remote Start Feature Program Description: The brake system control module software in these vehicles may contain an error. If (i) the vehicle is started remotely using the MyChevrolet, MyGMC, or MyCadillac mobile app or (ii) the driver enters the vehicle and waits five or more minutes before starting the vehicle using the ignition, this software error can, in rare cases, disable the vehicle’s electronic brake assist and illuminate the ESC, ABS and BRAKE telltales. This occurs at startup and the telltales are illuminated before the driver puts the vehicle into gear. Repair Description: Dealers will reprogram the brake system control module.
Based my my research, the first 3 minutes of this video would work for the GMC grill removal as well. I am trying to see if there are any sensors that need reprogramming (for certain models like the denail's) by the dealer. I want to add an LED Light bar and planned to try this method in the video below. https://www.youtube.com/watch?v=nHJDxKdllbQ
By any chance did you talk to the regional district manager when you opened your case with GM? Can you find out who that is? A talk with them might get you some more goodies. Basically start out nice, explain everything that you have been through, that the dealer is working on fixing things but that you have lost time with your vehicle for this long, multiple trips to the dealer, unsafe conditions, discrepancies in the documentation, and now they are replacing your vehicle with a totally different vehicle (diesel, not gas). The district manager may do some more stuff or approve more incentives for you or accessories to outfit the new truck, oil changes for life, tire rotations, etc etc, but take the truck to a different dealer for the maintenance work. Cant hurt to ask. Just my 2 cents.
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