4wheeldrive stoped workin all of the sudden

Jeremy Murphy

Asked by Feb 16, 2016 at 05:52 AM about the 1996 GMC Suburban

Question type: Maintenance & Repair

Long story short bought sub used 250,000 plus miles when got it home I tested the 4wd
worked perfectly. But i let it sit in the yard for about 3 months till i could replace the spider
injector, plugs and wires. Got it done last week and I wanted to play around so I press 4L
nothing, no light flash no sound of it locking in. Same happen with 4H, but the 2H button
is fine light works and everything. Idk like could I have nocked a plug loose Cause I had to
disconnect a lot to do the spider injector. Or maybe a fuse blown, or sensor went bad, or
4H 4L switch is bad, or could it be from the battery dying while it sat and it mess with the

1 Answer


The transfer case shift motors fail a lot, you might try tapping on the motor assembly while someone try's to put it in 4WD HI and see if it switches, if it does then you need a new motor assembly, if it doesn't then you will have to start to run diagnostics on the electronics, that can get complicated, so if you have to go there get a shop manual with good wiring diagrams.

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