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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 03-04-2015, 12:26 PM
thenewguy thenewguy is offline
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2004 GMC Envoy SLE
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4x4 Not Working

I have a 2004 Gmc Envoy SLE and the 4x4 isn't working. I have no service 4x4 light on. Everything seems to work fine but the front tires won't spin. It snowed a couple of days ago here and i tried going up a hill and I coulnt. The front tires just won't work. I switch into a4wd or 4hi or 4low and I hear the right noises. I've heard that it could be the encoder motor? But I'm not sure. Oh maybe I should add that I did get stuck in mud a couple of weeks ago also haha
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Old 03-04-2015, 02:56 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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If you have no Service 4WD light on and the selector switch lights are correct, and the front drive is not engaging, the front splined disconnect is likely not working. This assembly is known to fail like this because it dries out and binds.
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Old 03-04-2015, 09:42 PM
thenewguy thenewguy is offline
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Know how much that could cost to fix? And what are some signs that the encoder motor is out?
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Old 03-05-2015, 10:33 AM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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Replacing or servicing the splined disconnect is somewhat labor intensive. The replacement part is also expensive ($250+).

The encoder motor has nothing to do with the disconnect, it is on the transfer case and selects the mode of operation. Since there is no Service 4WD light on, the encoder motor and disconnect actuator are probably working correctly.
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Old 05-17-2015, 12:32 AM
thenewguy thenewguy is offline
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I still haven't fixed the problem, I went to look under today and saw alot of oil in the front axle of the driver side. Also to add, When I was stuck in mud I try putting it in 4low and while doing so i heard a loud crank.
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Old 07-08-2015, 01:19 PM
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roshirim roshirim is offline
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trail blazer EXT 4*4 ls, 4.2 6 cyl Chevy TrailBlazer LS EXT
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Quote:
Originally Posted by thenewguy View Post
I still haven't fixed the problem, I went to look under today and saw alot of oil in the front axle of the driver side. Also to add, When I was stuck in mud I try putting it in 4low and while doing so i heard a loud crank.
this can be the seal on the front differential.
part # 1925-7296 (seal)
19257296 (which replaced 12471618)
https://forums.trailvoy.com/showthread.php?t=125538

You can make a manual test and see is the front axle disconnect is working.

put the truck in 2WD, remove the 4*4 switch actuator, and push where the hole is located (when you remove the switch actuator) and try to move the front prop shaft. it must be locked.
else try to push a little harder and must lock.. else there is a problem probably with your front splined disconnect axle.
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Old 04-09-2017, 06:50 PM
Jamie1 Jamie1 is offline
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2002 Chevy TrailBlazer LS
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do I have to reprogram the tccm when I replace it with new oem part
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4x4, 4x4 drive train, encoder motor

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