On my 2004 avalanche the 4 wheel drive has been engaging automatically when I am in 2 wheel drive on dry pavement----does it without warning and sometimes will not disengage----have to go to 4wd auto, then try to get 2wd-------------faulty sensor? or connection?
Thanks
Bill Smith
Possibles--chech and test 4wd / transfer case module --faulty switch --- transfer case failing
SOURCE: 4 Wheel drive not engaging.
After finding a vacuum line that was off from the auto body shop that never was reconnected , after they removed it when they replaced the left side fender from a crash. Reconnected it and now it works. It was hard to find. Due to it is located below some other componets and wires.
SOURCE: noisy in 4wd quiet in 2wd
Sounds like the transfer case may be low on fluid. Does it do it in 4 high as well as 4 low? if so then its either low on fluid or its on its last leg. It just takes normal automatic trans. fluid if I remember correctly. It should have a drain plug on the bottom and a fill/check plug up towards the top a little ways from that.
SOURCE: chev 4wd problem
You need to have it scanned. It sounds like a bad speed sensor in the transfercase.
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