htoooh

Yup, it's all on me. I should have read the book. However, even though we now know, I do find it unacceptable that the truck will set the parking brake without my knowledge or input. I really hope GM rethinks this idea and corrects it.

So, I was towing my 2019 Next Gen Sierra 1500 behind my motorhome after getting a Blue Ox baseplate and NSA tow bar installed. I discussed with the tech whether or not I needed to disconnect the battery or pull a fuse and he said that as long as the steering wheel would turn without the key in the "on" position then I shouldn't need to. About an hour and a half later I was stopped at a stop light and when I took off I looked back in the mirrors and saw smoke barreling out of the rear end of the pickup. I pulled into the middle turn lane and found that the parking brake had engaged and it wasn't me that engaged it!! I was finally able to get the parking brake to stay off by starting the truck, placing the transmission in neutral until I could pull off to a safe place. I got out the owner's manual and it specifically states that the battery must be disconnected when towing as the parking brake can set itself automatically. This experience cost me two new tires as dragging the truck to a stop put flat spots on each tire. One tire was through the first set of cords while the other didn't get that deep into the tire. Why, WHY, does GM do this?? It makes no sense.

This is a great response for me. I was trying to figure out if the axles were indeed turning in 2H on the single speed transfer case. I had to edit this, I put the truck into gear, forward and reverse, with the single speed transfer case in 2H and the axles do, indeed, turn. So, I'm hoping that there will be sufficient lubrication as I plan to flat tow a single speed transfer case in a 2019 GMC Sierra with the drive shaft disconnected. I will be installing a drive shaft disconnect that I can control from the driver's seat. The disconnect will stop the drive shaft from turning and the folks who will install it say that I can tow with the vehicle in Park. Since the front axles are not turning I'm assuming that the front wheels will get the proper lubrication as long as the transfer case stays in 2H. Any thoughts? The manufacturer of the disconnect switch says that they have installed these parts on single speed transfer cases with no problems and no returns. I don't think I'm going to worry about it but I am interested in what others think.