Cannot engage 4WD

1994 GMC C2500

94,000 MILES • V8 • 4WD • AUTOMATIC

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Cannot engage 4WD. It was engaged this AM but when in a parking log I disengaged. It will not go back into 4WD.I tested the little module in the front end with 12VDC and it extends Also checked fuse for 4WD and swapped with another 25Amp. Please advise Thanks

Nov 1, 2008 at 4:43 PM

SQM

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Hello,

It sounds like the issue could be with the transfer case actuator.
There was a service bulletin for the transfer case actuator. It was for similar issue that you are having.
This will require checking of the wiring harness.

https://www.2carpros.com/articles/how-to-check-wiring

I have attached the service procedure for that service bulletin below.

Please let me know of any questions.
Thank you.

Images (Click to enlarge)

Nov 8, 2021 at 8:44 AM