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4X4 not working

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Great glad to hear that it works now there is a new problem. Ok lets check the pink wire at the switch, make sure there is power to it. Also check fuse number 9 and number 4. The pink wire should have 10 volts or more with the key on engine off. Then check the gray wire it should have power too. Let me know what you find here and we will go from there.
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Thursday, March 19th, 2009 AT 9:42 AM
Tiny
JASON LOCK
  • MEMBER
  • 13 POSTS
I checked the 9 and 4 fuses and they are good. The pink and the gray wires do not have power. A brown wire has power when the key is on. If I hold the switch button in and play with the button the indicator light will come on but goes out as soon as I release the button.
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Tuesday, March 24th, 2009 AT 11:29 AM
Tiny
JKBNOBLE
  • MEMBER
  • 2 POSTS
Are you refering to the encoding motor for the push button 4x4? If so, can you tell me what it is like getting it out and replacing it? Thanks!
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Thursday, March 26th, 2009 AT 7:01 PM
Tiny
JASON LOCK
  • MEMBER
  • 13 POSTS
When I say 4x4 button imean the switch on the dash which selects whether its in 2x2. 4x4 auto, 4x4 low, or 4x4 high. It can be replaced by taking lose the dash panel around the gauges and odometer.
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Saturday, March 28th, 2009 AT 12:08 PM
Tiny
EXCIDO
  • MEMBER
  • 8 POSTS
Hi, thanks for the easy and detailed description and troubleshooting.

I have a similar problem.
1998 Tahoe (on small island of Guam so parts are hard to come by).

I use 4x4 allot getting boat out of the water. It was working fine until last week when it stopped working.

After reading your thread, I found that my #2 fuse was also blown. I replaced an 4x4 worked immediately - once. Now I blow a fuse every time I replace the fuse and the engage the 4x4!

Help?
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Wednesday, January 2nd, 2019 AT 10:44 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like the encoder is shorted out can you unplug it and then replace the fuse then try the 4x4 to see if the fuse blows. If not replace the encoder/actuator.
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Wednesday, January 2nd, 2019 AT 11:25 AM
Tiny
GOROUGHERS
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 146,000 MILES
Acts like hung in 4wd low when I accelerate rpms go way up wont go over 25mph dash controls for 4wd dont light dont seem to do anything this all started after putting in to 4wd check engine light not on
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
It does sound like it is stuck in 4 low. Chances are the actuator is bad on the transfer case. Check to make sure there is power to the actuator. If there is, remove it and see if it responds when you switch the gears.

Let me know what you find.

Joe
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
REDNECKCLAUDE
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET TAHOE
1995 Chevy Tahoe V8 Four Wheel Drive Automatic

i just bought a 1995 tahoe.I have a problem with my 4x4 it not engaging. Ihave checked all the fuses. Also the light on the panle in the floor to show the 4x4 is engaged is not working. What should I check
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you checked to see if the actuator on the transfer case is getting power?
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
BK_FREEMAN1776
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 217,000 MILES
This weekend we had a huge snow storm, and I had to use my 4x4 to get home and around. I was in 4h and it was working just fine and then all the sudden my windshield fogged up really bad and my 4x4 disengaged. Would you say it was my tranfer case vacuum switch? If so, where exactly is it located and is it easy to replace? What usually causes this switch go bad? Thank you
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Check on the front axle for disconnected vacuum hoses.

Let me know what you find.
Joe
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
CUPOFJOE84
  • MEMBER
  • 10 POSTS
  • 1996 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 226,000 MILES
My 4wd is not working haved traced wires and all seems to be well. I have replaced the front accuator and the transfer case motor also got a differnt tccm and the switch on the dash. Well icome to find out it does work in 4 low but 4 hi will not work. Any help would be great.
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Are you getting power to the actuator when you shift to 4 hi?
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
CUPOFJOE84
  • MEMBER
  • 10 POSTS
Front axle will get power but transfer case motor does not
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you checked relays?
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
CUPOFJOE84
  • MEMBER
  • 10 POSTS
Only relays are in the tccm, unless I am wrong
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I believe there are relays for it under the hood. My mind is going lol It's been awhile since I saw one of these.
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
PGLENN
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 148,000 MILES
Selector switch light will blink briefly when selecting 4WD HI or LO, but reverts back to 2WD. Will not engage 4WD.
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Check to see if you are getting power to the actuator on the transfer case. If you are, chances are the actuator is bad.
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Wednesday, January 2nd, 2019 AT 6:44 PM (Merged)

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