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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #71  
Old 02-20-2017, 07:38 PM
fixer34 fixer34 is offline
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2002 Chevy TrailBlazer LTZ
Olympic White 4.2L I6 4X4
Join Date: Jul 2012
Location: Chicago suburbs, IL
Posts: 13
Replaced front axle disconnect actuator, still no work

So I followed the directions at the beginning of this thread. Transfer case motor works fine. Front axle disconnect actuator didn't make any noise. Pulled it and connected to a second TB I have . Still nothing; great, bad actuator, buy a new one. Install it and still no noise/motion. Take the new actuator to the second TB, plug it in and it works. Put new one back on first TB, still nothing. Connector/wiring look good, no damage/corrosion, wiring harness looks fine. What now? Is there a wiring diagram I can trace back? Bad fuse?
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  #72  
Old 01-26-2019, 06:18 PM
Babbnav Babbnav is offline
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Join Date: Jan 2019
Posts: 1
03 trailblazer, service 4wd light came on after making a left hand turn. I did all the troubleshooting described in this post.

I have the indicator lights on the switch, i hear the encoder motor and axle actuator working (both are under a year old)

Jacked the front end up with it in 4hi and wheels turned together (but opposite directions)
Dropped the right side and the left tire doesn't spin freely...the shaft does move with the left wheel.

So what's next?
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  #73  
Old 03-23-2019, 10:23 PM
1829 1829 is offline
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2003 Chevy TrailBlazer LS
Sandstone Metallic 4.2L I6 4X4
Join Date: May 2018
Location: Western Maryland
Posts: 1
Old thread revival: My '03 TB with 156K on it popped the "service 4wd system" light the other day along with no lights on any of the positions on the selector dial. Read the initial post for this thread, cycled the selector switch about 30x and just for kicks pulled fuse #8 and re-installed.

Problem solved
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  #74  
Old 03-24-2019, 01:14 AM
TJBaker TJBaker is offline
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2002 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Dec 2010
Location: Alcoa, TN
Posts: 27
After living with this and similar issues for 8 years I finally took apart the switch and cleaned the switch contact surfaces.
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  #75  
Old 03-24-2019, 12:34 PM
fixer34 fixer34 is offline
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2002 Chevy TrailBlazer LTZ
Olympic White 4.2L I6 4X4
Join Date: Jul 2012
Location: Chicago suburbs, IL
Posts: 13
Quote:
Originally Posted by fixer34 View Post
So I followed the directions at the beginning of this thread. Transfer case motor works fine. Front axle disconnect actuator didn't make any noise. Pulled it and connected to a second TB I have . Still nothing; great, bad actuator, buy a new one. Install it and still no noise/motion. Take the new actuator to the second TB, plug it in and it works. Put new one back on first TB, still nothing. Connector/wiring look good, no damage/corrosion, wiring harness looks fine. What now? Is there a wiring diagram I can trace back? Bad fuse?
Guess I never came back with the fix on this. Turns out the +12v wire going to the front actuator was broken 'somewhere', so no power to the unit. Tried to trace it back but why is the fuse/source in the panel under the back seat?? I gave up and ran another wire from a fuse in the engine compartment fuse block down to the actuator. Bingo, been working fine since.
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  #76  
Old 05-07-2019, 11:02 PM
o0skittles0o o0skittles0o is offline
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Join Date: Apr 2019
Posts: 2
Weird rubbing sound when in 4wd??

Sorry if this has already been covered, couldn't find anything (please direct me if it has).
I have an 05 TB, well over 250k(I'm the 3rd owner and put something like 10k on her in the 3 months I've owned her) and my 4wd seems to work well, but I've noticed a weird rubbing sound from the front end lately whenever I put her into A4WD (usually just use 2HI, and haven't used 4HI or 4LO yet)
I wouldn't call it a grinding or clunking, really just sounds like something plastic rubbing against the front wheels or axle or something, but I've checked and there doesn't seem to be anything that could be rubbing... Any advice for this gal who likes to think she knows what she's doing, but really doesn't?
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  #77  
Old 12-01-2019, 09:52 PM
Big-D Big-D is offline
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2002 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Dec 2019
Location: Wisconsin
Posts: 1
I've narrowed down my 4x4 issues. I have no power to the actuator. I figure it's a broken wire somewhere. I tried finding the bad spot in the wire but had no luck. Instead I too just ran another 12 volt wire to the actuator. Worked perfect! The actuator ran in and out great until I installed it back onto the disconnect. I engaged the 4x4 and it all locked in great, but now the actuator will not return to the 2wd position. The transfer case disengages but the actuator does not. Kinda comical I've been fighting this 4x4 engagement issue and now I have a disengagement issue.
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  #78  
Old 12-02-2019, 03:30 AM
dookeye dookeye is offline
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2005 Chevy TrailBlazer LS EXT
Light Pewter Metallic 4.2L I6 4X4
Join Date: Mar 2018
Location: Phoenix, AZ
Posts: 5
I just started using the 4 wheel drive on my 05 TB and I get the 4wd repair light now every time, but so far the 4wd seems to be working? Not sure about the A4wd.

I'm wondering if the 4wd repair light throws any codes? I put my cheaper Bosche code reader (~$70) on it and it doesn't show anything, would a more professional code reader or scope be able to find a code for the 4wd?
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