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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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  #1  
Old 08-24-2005, 11:04 AM
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Service 4WD Light

Anyone have access to or know the TSB number for the Service 4WD light problem on a 2002 Trailblazer? I don't feel like paying for the alldatadiy service, and can't find the TSB anywhere else. Anyone have any idea if the dash switch is the cause of this intermittent problem? (light comes on, and indicators over the switch do not work).
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  #2  
Old 08-24-2005, 11:15 AM
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Is you vehicle a 2WD or 4WD?...just kidding. I find (3) TSBs regarding "4WD" light on condition for an '02 T/B. 04-04-21-004, 02-04-21-006D, and 02-04-21-002A. Good luck..
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Old 08-24-2005, 11:19 AM
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beat me to it...
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Old 08-24-2005, 11:43 AM
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Thanks for the numbers! I know there's some on here who have access to them, just wondering if anyone's got any of those TSB's they can send my way? I'd be SOOO glad. The truck, the last two mornings, and once last week, has been showing "service 4wd" upon starting it. No matter how many restarts, light stays on, and indicators over switch (little orange lights) aren't lit. I get to work and park, by lunch, problem's solved It has been cooler the last couple mornings here, and not as humid, wondering if that's related to it? Anyone else had this problem, it seems to be a common GM problem, not just with this platform either. Thinking of replacing the switch, I think I found it on gmpartsdirect for 30 shipped. I have extended warranty, but I got it with a $200 deductible and I think I can probably fix it for less than that, long as the whole transfer case isn't shot!
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Old 08-24-2005, 11:44 AM
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NOTE: I will remove the full text of these bulletins within 24 hrs. I was able to find these:

Service 4WD Indicator Illuminated, DTC B2725 Set, Transfer Case Selector Switch is in One Position - Indicator Lamp Indicates Another Range Is Selected (Replace Transfer Case Shift Control Switch) #02-04-21-002A - (02/11/2003)

Part Number 15194913
Switch, Transfer Case Shift Control
Qty 1

---------------------
and...

Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System (Reprogram Transfer Case Control Module) #02-04-21-006B - (08/18/2003)
with Electronic Shift or Active Transfer Case (RPO NP1, NP4 or NP8)

Correction
Remove the underhood (ATCM or TREC) TCCM fuse.
Wait 30 seconds.
Reinstall the fuse. The module should "wake up" and communicate with the Tech 2.
Check for codes in the TCCM. If a C0550 is found, replace the module and go to the next step.
Reprogram the TCCM using normal procedures...

---------------------

Try removing the fuse as per the 2nd TSB to see if that helps. Edit: You're right about this being common for other vehicles too... the 2nd TSB includes all 2002-03 GMT360/370s (TB, Envoy, Bravada) full-size pickups, and the Tahoe/Suburban too. Bascially anything w/ an electronic t-case.
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Old 08-24-2005, 11:47 AM
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By the way...

They are all listed in the resource section of the site!

http://www.trailvoy.com/index.php?page=resources
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Old 08-24-2005, 11:55 AM
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Freakin A! I had no idea they were all listed here You all are great, thanx for the help! Looks like I'll try the fuse pull, probably replace the switch, if none of that I'll try to get the control module updated! Hope that doesn't cost too much, or if it does it's over my deductible for my extended warranty!!! Maybe it won't go that far!
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Old 08-24-2005, 12:10 PM
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I can get to the page w/ the TSBs, but it only shows a short blurb about what each TSB is and doesn't have repair info. Is there another page that has the full info?

BTW - I understand you can buy CDs off eBay with the full info, and some public libraries actually subscribe to the full AllData service for all vehicles.
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Old 08-24-2005, 05:41 PM
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I have the same thing happen to me. Usually after a few starts it shuts off...very annoying.
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  #10  
Old 09-01-2005, 09:22 AM
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Quick update to this thread, I've been waiting for my truck to do this again so I could try pulling the fuse and see if the control module "wakes up". This morning the truck had the above mentioned problem, I restarted twice to make sure the condition wouldn't disappear on its own. After pulling the fuse and restarting again, all was well. Looks like it may require the control module reflashed or replaced. I want to wait until it does it one more time to confirm pulling the fuse is what reset it. If extended warranty will cover it I'll get it replaced, if it won't, I guess it'll depend on the cost. I was hoping it'd be the $30 switch on the dash, but should've known better
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