the other strange things include the mirrors will not stay in the position that i set them, the radio will shut off and come back on again or change stations and the HVAC controls do not function properly, a youtube video on the symptoms i am having indicate a bad BCM

no

unless He was quoting a gm tsb, the only thing that tells me is there is various interior systems malfunctioning when you turn off, leave, come back to, open, and start your car. Do you have memory seat option? And do you use both key fobs?

does your car have working ac? At least some of the time.

I have memory seats and mirrors the AC functions it does not direct the flow of air to the vents and the radio will act up, the video stated that all of said problems are related to a bad BCM, i have used just one key fob

I can get the HVAC control to work by taking the temperature all the way up and then all the way down and hitting the defrost and back to the floor and back to mid

also on you tube a video was made that a man had trouble with his mirrors and windows not working properly, he took the BCM out, opened ot up and resolder the broken joint on the circuit board and it worked just fine

well did you do the same thing? Unless you pop yours open that is not at all a likely cause especially since you have two things most of those systems share. Grounds and memory seat / personalization options. Have you checked all fuses, looked at your IP grounds? If you say something about the guy in the video one more time I will just assume that you followed his advice and it worked and the problem is fixed :/

im telling you, that since you don’t know that is the issue it is both cheaper and easier and wiser to check what doesn’t cost money and you already have and there is countless years of reasoning to justify the approach of check grounds and things that the multiple circuits branch too. You have a memory seat module under your seat and grounds under carpets in your car. See where I’m going? Any water issues ? Like ac drain or sunroof or door seal windows left open ? Moisture on inside windows etc. Also, where at any point have you had it scanned for codes? I don’t see that. That’* like step 2 or 3 and you’re trying to jump to step 8 or 9. If you haven’t checked any codes you have 0 business chucking modules at the car, you are insane to do that when the factory modules are reliable most overwhelmingly and they will show fault codes somehow, either in other systems or directly if they can monitor it themselves. It’* all got a trail you just gotta track it. Strategy based diagnostics

I do apologize and hope you are not upset, I do appreciate your advice, and you are right about the codes, the video DID SAY to check for a U0140 code saying that indicates a bad BCM, I went to auto zone to use their scan tool but got no code at all, I guess i need to find someone with a better scan tool, the other parts store in my area no longer have scan tools because people have been stealing them left and right i will check the battery cables and clean them and look for any grounds, you did mention grounds by the kick panels on both of the dirver side and passenger side, are there any other grounds and where are they located and what are IP grounds?? once again thank you for your help

How did we go from gas cap to HVAC to mirrors? Please keep it to one topic only and you already have a thread open on the BCM. So keep the BCM chat in that one.

I apologize for any confusion that the thread caused anyone, I tried to keep the threads separate , I was just asking if the BCM had anything to do with with the gas cap and things got blurred between the gas cap thread and the BCM thread, once again I apologize to everyone thank you for all your help

im not upset. I get passionate for people lol. IP grounds are instrument panel grounds. I don’t know the exact location but under carpet behind covers etc by the floor on the side of the car so vertical. But low enough usually covered by carpet. If you pull carpet back and trim you usually find them. The one by passenger feet is most likely the one the BCM May use for some functions. And the left side would more likely be DIM and IPC but they all can do various. The there are other grounds. Not all would be critical but there are at least usually 4 solid important engine management ones in bay, one near battery for chassis to battery, where ever negative cable finds the motor, and a few in the rear of trunk for fuel pump sometimes but your emissions stuff, which would be gas cap related, could use a ground back there so it’* wise to check em all. A u code wouldn’t say a bad bcm but it would help diagnosing a bad one if t happened. A dead bcm wouldn’t have a code, and your car couldn’t operate. So bcm failures that don’t cripple a car are not often directly indicated by a code since it’* functionality might still work enough for most things. Or intermittent. A u code would say if something had class 2 issues or if there was a hard memory fault. But it could only really indicate another nonessential module sometimes. If a module is deader than disco it’* usually leaves a code in another module or multiple. It is all dependent on the car specific situation. So I recommend those grounds and then finding a dealer or shop to read body codes. Might look for a mobile mechanic.