4 wheel drive not working-please help!!! - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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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 11-26-2009, 06:37 PM
sherri sherri is offline
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2004 Chevy TrailBlazer LT
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Question 4 wheel drive not working-please help!!!

My service 4 wheel drive light went on in my 2004 Trailblazer and I took it to the local dealership. They scanned it and found code c0327-encoder circuit malfunction. They tested and found encoder motor failure. Bought new encoder motor from the local auto parts store and installed it. The service 4 wheel drive light went off but the 4 wheel drive is still not working. What else do I need to do?
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  #2  
Old 11-26-2009, 06:52 PM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
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A quick search of previous posts with 4WD system problems (my specialty) shows there are two questions I always ask:

1) Do you hear distinctive motor noises when changing modes?

a) There is a high pitched noise lasting about 2 seconds from the front axle actuator. This one ONLY happens when going from 2HI->A4WD and from A4WD ->2HI.

b) The encoder motor makes a lower pitched and shorter duration noise in EVERY mode transition. 2HI->A4WD, A4WD->4HI, and 4HI->4LO and the inverse of those three.

c) Going into and out of 4LO also makes a clunk, and can only happen if you're going <5 MPH and in neutral.

2) If it makes the proper motor noises and goes into 4HI mode, and you jack up and support the front end, and rotate the driver's wheel, does the passenger's wheel rotate backwards?

Other relevant questions:

3) What kind of functional test have you done that says 4WD isn't working?

4) Any other maintenance history?

5) How many miles?

6) Did you change the transfer case fluid every 50K as recommended in the Owner's Manual?
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  #3  
Old 11-26-2009, 07:26 PM
sherri sherri is offline
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There is no high pitch noise from the front axle actuator. The encoder motor does make the low pitch noise and going in and out of 4LO also makes a clunk. When the car is jacked up, the passenger wheel does not rotate backwards. I took the vehicle out and found out that it was spinning in the mud instead of driving right through it. The transfer case was replaced last year. We had a used one put in from a trailblazer with 30,000 miles on it. I have 110,000 miles on mine now. The transfer case fluid has been changed.
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  #4  
Old 11-27-2009, 03:25 PM
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You could have a bad front axle actuator. They're available on Ebay all the time. It's odd that the TCCM doesn't detect that failure though, and light up the "Service 4WD" light. I'd take the actuator out and see if it works while suspended in the air. I posted a thread about rebuilding one that just had a grease build-up on a copper PC board stripe inside. It would move, but not to the end-points, when mechanically loaded down by the spring inside the actuator mechanical assembly. When in midair it worked perfectly.

But for yours to not make a noise is very unusual. Try resetting the TCCM by pulling underhood fuse #8 for 30 seconds, then putting it back. See if the system behavior changes.

Also check rear fuse block fuse #48, that only powers the front axle actuator and the NEUTRAL mode light. Does the NEUTRAL mode work as the Owner's Manual says it should, and its light come on when expected?
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  #5  
Old 12-02-2010, 09:16 AM
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snaraLT snaraLT is offline
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Quote:
Originally Posted by the roadie View Post
You could have a bad front axle actuator. They're available on Ebay all the time. It's odd that the TCCM doesn't detect that failure though, and light up the "Service 4WD" light. I'd take the actuator out and see if it works while suspended in the air. I posted a thread about rebuilding one that just had a grease build-up on a copper PC board stripe inside. It would move, but not to the end-points, when mechanically loaded down by the spring inside the actuator mechanical assembly. When in midair it worked perfectly.

But for yours to not make a noise is very unusual. Try resetting the TCCM by pulling underhood fuse #8 for 30 seconds, then putting it back. See if the system behavior changes.

Also check rear fuse block fuse #48, that only powers the front axle actuator and the NEUTRAL mode light. Does the NEUTRAL mode work as the Owner's Manual says it should, and its light come on when expected?
A Big Thank You to The Roadie and Trailvoy!

After our first Mi snow yesterday I found that when I flipped the switch to AWD or 4HI nothing happened. A quick search of the forum lead me to this thread, where I copied down the diagnostic steps above.
After "resetting" the TCCM by pulling fuse #8 for the 30 seconds and putting it back in, my AWD and 4HI & 4LO all are working perfectly
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  #6  
Old 12-02-2010, 09:35 AM
jchandler jchandler is offline
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Wow! I bookmarked this thread for sure!!!
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  #7  
Old 12-02-2010, 12:15 PM
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Quote:
Originally Posted by snaraLT View Post
After "resetting" the TCCM by pulling fuse #8 for the 30 seconds and putting it back in, my AWD and 4HI & 4LO all are working perfectly
Thanks for the kind words. Be aware that 2002 TCCMs are notorious for failing slowly, and you may find someday that it's dead and the reset doesn't work and then you need a 2003+ TCCM to wake it up again.
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  #8  
Old 01-23-2011, 12:38 PM
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wifestrailblzr wifestrailblzr is offline
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axle actuator

Wow, thanks a bunch. I had my differential replaced last year. Since then, the four wheel drive wouldn't engage fully all the time. Mostly, it would only work in Automatic 4WD.

Read this thread, went outside and pulled the fuse. Viola! Works like new.

Thanks again.
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  #9  
Old 02-13-2011, 02:39 PM
Samson Samson is offline
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4-wheel drive will not engage!

I have a 2002 Trailblazer EXT w/ 100k. I never had a problem with the truck's 4-wheel drive system until this winter. With the recent snow storms hitting the NE, I really needed it... During the 1st snow storm, the 4-wheel drive system worked great until the 4-wheel drive check light came on. The check light went away and never returned, but now when I flip the A4W and 4HI switch, it lights up but the system doesn't engage. It makes a whirling, grinding noise. 4Lo doesn't light up at all. Need help, any helpful suggestions or answers?
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  #10  
Old 02-13-2011, 03:56 PM
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Quote:
Originally Posted by Samson View Post
..when I flip the A4W and 4HI switch, it lights up but the system doesn't engage. It makes a whirling, grinding noise.
WHAT lights up? The lamp on the mode you're trying to go INTO? or the one you're coming FROM? Describe exactly what you see for blinking and steady lights and hear for noises under the vehicle, as you change mode from 2HI to A4WD, and also from A4WD to 4HI.
Quote:
4Lo doesn't light up at all. Need help, any helpful suggestions or answers?
Are you in NEUTRAL and rolling under 2 MPH or at a stop when you attempt 4LO? If so, as before, describe the lights and noises you hear. If not, check the Owner's Manual, since there's an interlock.

At 100K, you should be about to change your transfer case fluid for the second time. What's your maintenance history on the transfer case and differentials?
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