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GMC Forum: Problem with 4 x 4
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Old 11-04-2017, 04:01 PM
SolidDerek SolidDerek is offline
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Drives a GMC Truck
Join Date: Nov 2017
Posts: 2
Default Problem with 4 x 4

Hi, has anyone had a problem with a Jimmy (2002) that has problems switch the 4x4. Either It will not go back into 2wd or will not go into 4 HI.

It was stuck in 4HI/Low
Replaced: -small threaded vacuum switch on top of transfer case, because it was siezed.
-Cable from vacuum actuator to front Differential, because it was siezed, then broke

After replacing those, 4x4 still would not switch back, It would attempt to switch back, but nothing would happen.

Some say to it could be the TCCM (replace with 2003 or newer, or new one) and others say its the Encoder motor down at the transfer case, that maybe its getting weak and has trouble switching the 4x4.

Also I had unplugged the electrical connector at the encoder motor to check it, and when i plugged it back in, i had tried my 4x4 switch again, and it switched back! but still problems with the 4x4, as now it won't go into 4 HI.

Does it sound about right to replace the encoder motor at this point now? Possible TCCM?

*I now have it in 2wd
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Old 03-06-2018, 07:22 AM
shaynehardy shaynehardy is offline
Drives a 1993 gmc jimmy s15 4wd 4.3l cpi
Join Date: Dec 2010
Location: canada
Posts: 62

encoder motor is the only peice i would change at this time
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Old 04-27-2018, 06:48 PM
spark802 spark802 is offline
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Drives a GMC Truck
Join Date: Apr 2018
Posts: 2

theres also a vid on changing out the encoder
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Old 07-31-2018, 01:21 PM
atrjeep atrjeep is offline
Junior Member
Drives a GMC Truck
Join Date: Jul 2018
Posts: 3

2000 Jimmy 4x4. Just replaced the switch on the dash, about $30. Works like a champ. Not sure if this would be the same issue as your's, but very quick and easy fix.
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