Originally Posted by ChevyJim
got a 95 gmc jimmy ( 4.3 , auto etc.) went to shift into 4 wd high today, and wouldn't shift. Got it home, played with the 4x4 buttons and found that it will shift straight from 2 hi to 4 lo, will not go to 4 hi. any ideas? indicator light not burnt out. drove it in 4 lo, then tried to go to 4 hi, it went straight back to 2 hi. I'm stumped. am I missing something stupid? should I trade it a brand spankin' new Amish buggy? lol. I'm ready to start running my 24 year old chevy truck again, its still more reliable than anything new I've had!!!
any help is VERY much appreciated.
this will either be a interanl t-case malfunction or an encoder motor problem.
you need to have it scanned for codes since its a full electronic. if the truck does not have a SES light on, then it will take a scan tool, not a code reader.