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1994 GMC Sierra will not go into 4 wheel drive

I have a 1994 GMC 2500 Sierra and cannot put it into 4 wheel drive. I have installed a new electric axle actuator but it still will not go into 4 wheel drive and the 4 wheel drive light will come on.

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Posted on Jan 02, 2017

  • 383 Answers

SOURCE: 4 wheel drive will not engage on my 1989 gmc

actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

Posted on Feb 08, 2010

  • 507 Answers

SOURCE: 1990 GMC Sierra 4x4 1500

the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.

Posted on Sep 22, 2008

GM Elec
  • 1000 Answers

SOURCE: front axle stuck engaged

w9fro..In1995, and other model years, the actuator used to engage the transfer case into four wheel drive is oil filled with a heating element.
When you select four wheel drive the element heats up, the oil expands and engages the transfer case. Unfortunately if the actuator fails, the truck remains in four wheel drive. GM has an improved actuator so the problem does not repeat.
As always, check the basics, power, grounds and switch at floor select before replacing the actuator.
Also, if the truck is truly stuck in four wheel drive, you can tell by turning the truck in a tight circle. If the front end wants to "bunny hop" it is definitely engaged.
Best of luck, let me know.
Regards,

Posted on Feb 10, 2009

  • 1 Answer

SOURCE: I have a 1994 gmc 4x4 and the front axles wont engage

If Your Front CV shaft is broken it will not engage...Shaft can be in visibly good shape, but you might hear a knocking sound or a shutter when turning sharply. I had this problem this last winter. Get under the truck and try and turn the CV by hand. if it can be rotated, it is bad.

Posted on Jul 05, 2010

  • 14036 Answers

SOURCE: 4x4 still not working

you could have problems in the shift control module.or faulty switch in dash.

Posted on Jun 04, 2009

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4 wheel drive will not engage on my 1989 gmc sierra 2500?


actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

Jan 07, 2010 | 1989 GMC Sierra

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