Question about 1995 GMC Jimmy

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Four wheel drive

My 1995 gmc jimmy will go into 4lo but when I try 4hi the light blinks and goes back to 2hi! I replaced dash switch(electric) and the module. Like I said it will go into 4lo, what is the problem? It has been to the shop and module changed along with switch. Worked for mechanic but when I tried it a couple weeks later during a snow storm, no go. I only try to switch it in while it's in neutral! HELP

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  • GMC Master
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Try engaging the 4wd H when the vehicle is rolling slowly and in gear . Sometimes if the unit is actuated the gears will not line up an get stuck on the end of each other and will not mesh. If the gears are turning this is unlikely to occur and meshing is easier.. have the actuator checked (part that actually does the changing) and check the wiring or vacuum hoses if any used as there may be a leak or wiring /connector problem ( water /moisture/ dirty pins etc)

Posted on Feb 15, 2014

Testimonial: "@ bill boyd, my truck won't switch unless it is in neutral! thinking transfer case module on the actual transfer case!"

  • Angela LaRoe-Barnett Mar 10, 2014

    I must have 2 modules. My mechanic changed 1 behind the ashtray. I also have one behind the kick panel on the passenger side. How do I know which is bad? If I unplug the 1 behind the ashtray, and plug it back in, it will work for a bit but then stops working. So what is the problem? Changed TCM and dash switch and mechanic fixed bad vacuum lines that he found and still nothing.

  • Bill Boyd Mar 11, 2014

    I would be looking at the actuator module or actuator itself as unless your vehicle is very old changing hi-low 2-4-2 wd can be done on the fly ( in other words when the vehicle is in motion)

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Posted on Jan 02, 2017

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SOURCE: 1997 GMC Yukon 4-wheel drive electronic

Dave,
The problem your are speaking about could be a few things. All things that are somewhat common to go bad on Chevys/GMCs. Each one of the cars I worked on had a different problem. I have changed the switches, the 4wd solenoid, and TCM on different trucks. IMO the TCM location in the passenger kick panel is a poor location allowing water and other passenger debris to get into it. Once water gets in that area you can imagine already what occurs. One of the cars the TCM bracket was rusted by the ground and eventually the weak ground fried it. The weird thing is the TCM would allow it to shift sometimes and not other times or partially engaging causing the wonderful light to blink rapidly. What I have found of some time with these trucks is pushing the button to change the truck to two wheel drive and driving a few feet in reverse helps ease the change.

So you can start with a new switch that pops in and out of the dash in a few mins. Can get one on ebay for under 25 dollars. Although, I personally would take off the kick panel and take a look at the TCM. If you see any rust around it, my money would be on that.

Good luck

Posted on May 26, 2011

  • 1 Answer

SOURCE: jimmy wont lock in four wheel drive.

My 01 blazer is doing the same thing have you found out what is doing it

Posted on Nov 27, 2013

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