carnau

Double Post. Sorry

That's right. The MQE replaced the M5U. The MQE is what comes in all 19/20 trucks though. So the guy in this thread would have the MQE transmission as well. That's all I was saying.

There isn't a GM fix for it yet.

Do you know how to do a parasitic draw test? Do the test without pulling any fuses and find out what your base draw is. Come back here and let me know so I can do some more checking. https://youtu.be/yaHn0qOIHqg

This is actually an old version of it. The new version is #PIE0589A: Engineering Information - Request for Pictures On Rear View Camera Not Aligned Customer Concerns - (Nov 30, 2020) We actually fixed on of these recently. Shim the left side handle retainer with a .50mm/0.02" flat washer This isn't the repair for it in GM SI. But it will fix the concern.

MQE isn't a revised RPO, It is just the RPO that came out in the 2019 and up vehicles unless that's what you're talking about? M5U and M5X Are 8 speeds between 2015 - 2018 This is the 2019 - 2020 Trouble Shooting forums so everyone here should have the MQE 8 Speed.

It's the bolt that holds the HVAC box to the firewall. If something fell that means the case retainer is cracked and fell down. Here is a picture.

I wouldn't spend any money in it till I knew what was going on. That's money you could spend in purchasing a decent scanner and finding out what the problem is. Then you have a tool forever that you can use. Let me know the codes you get so I can help you further. Without them, it's all a guess.

Unfortunately not. Go to a programming shop that can program update the programming for you. It can be done.

What Year/Make/Model is it? What are the codes? Get me a little more information and I can help you.

Which part is their problem? You purchased a truck knowing it had the option. That's like buying a Pepsi and saying it should have Coke in it...

Ok, So part of this is exactly the problem. It's just very general which doesn't help you and that's no fault to @rusty503. He is exactly right. I have run into this many of times on these vehicles since i am the electrical specialist at our dealership . Unfortunately I can't see the vehicle to test it so I am not going to say it is not a body control module failure. Because it absolutely could be. Do I think it is? No. But again I can't test it personally so I will not say they are definitely wrong. I will explain to you though why I believe it is wrong and what I think you should look for in case the BCM does not fix it. And please, If the BCM fixes it let us know. I really enjoy these types of problems and am interested. The BCM uses voltage to keep it's memory (this is why it could be a bad BCM) When it falls below a certain voltage the Capacitors in the BCM discharge and this sends it into a relearn mode (telling you to roll the windows up and down, ect..) This is why I don't think the BCM is the problem. I believe you have a voltage drop problem on one of your battery cables. This is actually an easy test and don't take long. Do a loaded voltage drop test across your battery cables. You need less than 0.1 volt across all of them even though 0.2 volts is acceptable. If your voltage drop is higher on any of those cables or across the battery block (which is where I normally find the problem. Either a lug that's barely loose or a crack in the plate) replace it. The reason it's coming up with this is because during cranking the voltage drop is higher than normal. If you have (let's say) 2 volts of drop during cranking that means on a perfect battery your BCM would be seeing 10.8 volts and discharge the capacitors causing your vehicle to go into relearn mode. Here is the catch. Your vehicle isn't doing it every day (which makes me think it is the battery block again..loose lug or crack) so you will not see the full drop. But anything higher than 0.20 needs to be replaced. This will fix your problem IF the BCM doens't fix it. Because again... I can't test the BCM myself. I just have my doubts about it... But it is possible. If you need me to explain anything else, how to do the test or ect... Just quote me and ask so I get the message on my phone. If not i check here every few days. The Ad's are killing me and I don't really like to come here much anymore.

Great! I am glad it helped.

I am right there with you. I don't see how this could fix it. When you go, ask to see the part that was replaced and take a picture of it. They will not let you have it because GM could call for the warranty part back. I am curious to know what they replaced though lol. This truck only has a HVAC control module that controls the Manual and Automatic part of the system so I really have no idea what they are talking about. Yes please let me know what they replace. lol

Yeah, it was in the post lol. You need to do a logic lock reset. Remove the battery cables and let them sit off for longer than 5 minutes. Remove both cables. If you don't want to wait the 5 minutes you can hold both of the battery cables together for 30 seconds (with them both off the battery) and it will do the same thing as waiting longer than 5 minutes with the cables disconnected. What you are trying to accomplish is depleting the capacitors.