it is stuck in 4 wheel high, how do i diagnos this problem?
GMC Q&AAsk Your Question
1999 GMC Yukon Denali Question: stuck in 4 wheel
Answer #1Russ May 01, 2009, 13:57Master
The 4WD system is controlled by a computer. The computer will store fault codes when it detects a problem with the 4WD system. You will need to access the fault code(s). The stored codes should point in the direction of your problem.
Answer #2ssperlik July 02, 2009, 15:41Rookie
Had the same issue while in the OBX. Ended up being the last thing I checked working from the top down. Check the plug connection on the tranfer case. Mine came unplugged and the transfer case was not getting the signal from the computer to change. No fault codes were stored.
Answer #3Visitor, March 28, 2010, 23:25
put the truck on neutral and change to the desired setting
Answer #4Visitor, September 09, 2010, 18:22
i have the same truck with the same problem. the plug on the drivers side of the transmission over crossmember came loose and some pins were green from water getting in there. if thats your problem get some small brushes and take your time cleaning them. dont bend any pins spray with contack cleaner and blow dry. it worked for me
Answer #5Visitor, December 19, 2010, 09:40
stuck in low 4wheel drive
Answer #6Visitor, April 21, 2011, 19:14
Denali's are ALL WHEEL DRIVE. All 4 wheels pull all the time