4wd will not disengage, stuck in 4lo

1996 GMC JIMMY
150,000 MILES
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MICKIELESTER
  • MEMBER
  • 1 POST
4wd is stuck in 4lo. cannot get it to switch back to 2wd or 4hi. would like to disengage 4wd all together if possible, but need to get it back in 2wd as soon as possible so I can drive.
Jan 1, 2012 at 11:40 PM
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RIVERMIKERAT
  • ✓Experienced Mechanic
  • 6,106 POSTS
Hello.

There is an encoder that goes out not being able to switch the car out of 4WD. Here is the location of the unit so you can check it out.

Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Jan 2, 2012 at 1:29 AM
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SLAMMED94
  • MEMBER
  • 1 POST
This was the problem with my car I got the part for $134.00 and have not had a problem since.
May 11, 2018 at 6:08 AM
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STEVE MANDALA
  • MEMBER
  • 0 POST
Replaced that. also, the vacuum actuator and nothing changed still stuck on low just flashes at 2wd so I did the switch that worked FYI
Sep 19, 2022 at 12:01 PM
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