Sounds like most of you are suffering a 4WD Service light but that's it, is that right? Is anyone's truck shifting into 4WD-HI by itself and staying there? If so. have you had the problem resolved for good? (and how do you really know its for good?)
I have 1600 miles on a 2015 Suburban. A week after I got it I heard about the transfer case recall and took it in for that service. Shortly after that I had an issue where the truck went into 4WD-HI all by itself. I don't recall what position the switch was in when it happened but it was definitely 2WD or AUTO, not 4WD-HI or LO, and I was shifting from reverse to drive. After it happened, no matter what position I put the switch in the transmission remained in 4WD-HI (there's no mistaking it when you can barely make a u-turn). Along with this problem I had the Service 4WD light on the dash which makes sense. I took it back to the dealer, this time they kept it for 2 full days and told me the problem was caused by them incorrectly reprograming while they had it the first time to do the recall service and that they had to contact GM to discuss the problem because they'd never seen this before. "Okay, I guess" I thought to myself. Well, a few hundred miles later and my truck is once again stuck in 4WD-HI tonight and of course I have the Service 4WD dash light on again. How nice
Computers & software have no place being between a shift lever and a transmission! What happened to actual linkage? I mean look at the original recall "In the affected vehicles, an electrical signal short may cause the transfer case to shift to neutral without the driver's input. If the transfer case switches to neutral while the vehicle is parked and the parking brake is not in use, the vehicle may roll away increasing the risk of injury to bystanders. If the transfer case switches to neutral while the vehicle is being driven, the vehicle would lose drive power, increasing the risk of a crash. Dealers will recalibrate transfer-case control module software." Seriously!?
Now I own a truck that puts itself into 4WD whenever the mood strikes. What's next? Perhaps 4WD-LO, REVERSE??
If anyone else is having this problem I'd like to hear of your experience.
All this makes me wish I hadn't traded in that QX