Trying to find out where to start. every once in a while all three lights will blink and then the 4hi will blink, then stay on, 4 wheel drive is not working
SOURCE: 4 wheel low works but 4 wheel high does not.
sounds like the encoder on the side of the trans on the drivers side
SOURCE: i have a 1999 gmc
If you have front end problems like an pitman arm or idle arm needs to be replaced, it may not got into 4 wheel drive. Go to the nearest muffler shop or mechanic to have them lift up your truck to see if something needs to be replaced.
SOURCE: 1996 JIMMY / 4 WHEEL DR DOESN'T ENGAGE but LIGHT TURNS ON
The problem is in the transfer case. My mechanic said there is a pin that engages the 4x4. My pin sheared off. He replaced it. It works fine now.
SOURCE: 2000 GMC Jimmy Transmission Whine
Does it sound like a loud winding sound coming from the front right side? I have a 2001 Jimmy and the 4wd tries to engage when driving up steep hills and going at highway speeds. The actuator vacuum switch engaged when the transfer case vacuum switch sends the vacuumed air to the actuator. What is happening is their is either a leak in the vacuum lines, a faulty actuator switch, or a faulty transfer case vacuum switch. When the jimmy has enough air pulling in, the extra vacuum is trying to push the actuator switch in when it is not supposed to. It is a much cheaper fix than a transmission. GMC should have recalled the whole 4wd system on any of the S10's, the JImmy's, and Blazers.
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