I got into the vehicle and had not noticed it was in 4Lo until I pulled off
and then tried to get back to 2Lo and it would not take. Tried pressing all positions available and will take it just wants to stay in 4Lo. Even tried disconnecting the switch and hooking it back up and problem still exist. Please help
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Likely either a shifter position sensor, transmission position sensor, or a differential position sensor. Had same issue w/ my Montero and it ended up being one of the 5 sensors on the transfer case. It was pretty tough to get to, so replaced all 5. That fixed it.
If its a push button 4x4 take it to the shop its a VERY COMMON Problem dealing with the electric.Once you pay the $400 to get it fixed get rid of the truck and settle for a Jimmy/Blazer/Bravada with a floor shift 4x4..GM had problems with the push button 4x4.DONT DRIVE YOUR TRUCK IN THE MEANTIME.YOU WILL BLOW YOUR TRANSFER CASE RIGHT OUT OF IT!
pull 4wd fuse inside fuse panel and atc fuse from underhood fuse center, truck wil go back to 2wd,check control box behind pass.side kick panel ,elect. connector at box,full of corrosion will cause weird 4x4 problems!
There is a relay switch box under dash. But there is also a vacuum diaphram in the passenger front fender, which operates the front axle, that turns the light on and off along with the cable movement. Also there is a vacuum switch on the transfer case. When you flip the switch it sends the vacuum to the switch on transfer case which allows the vacuum back to the diaphram to pull the front axle cable. I would check for the vacuum lines first.