Question about GMC C1500

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My 2002 gmc 1500 4x4 is not working. it says it is engaged but still in 2 wheel drive. sounds like the front actuator is engaging. what should i do?

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  • Anonymous Dec 31, 2008

    1989 GMC K3500. Same thing. replaced switch at transfer case. Show power now to actuator. new actuator. spring goes in and back in front of actuator. new transmission. Can't find diagram. What's up.

    Wagons123

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Have you had the vacuum pump checked that moves the transfer case in and out of engagement? GM for years has used a vacuum pump system to do this and can fail fairly easily.

Posted on Dec 10, 2008

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I'm not familiar with your vehicle, but if you have a separate lever to engage 4wd, there will not be a fuse for the actuator - it is a manual system. If the 4wd is selected electrically, check that all wiring and connectors on the transfer case are in good condition.

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4wd will not engage on my 2001 gmc jimmy


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1996 gmc jimmy started making noise sounding like it is is right front was told need to replace wheel hub which was done. Still making the same noise in 2 wheel drive. when you push button for 4 wheel...


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3 Answers

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

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I have a 2001 GMC 1500 HD. The pushbutton four


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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,

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