Transmission/Transfer Case - unusual symptoms? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 05-16-2017, 11:28 PM
sportsfan10 sportsfan10 is offline
Junior Member
2004 Chevy TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: May 2017
Location: Greenville, SC
Posts: 2
Transmission/Transfer Case - unusual symptoms?

Hi all-
I'm a new Trailblazer owner and have searched the forum for an issue exactly like mine. Haven't been able to find it, so I'd like to put it out there for any expert guidance you are willing to offer.
I bought a 2004 Trailblazer LS with about 155,000 miles, routinely maintained by a government agency (not a police vehicle). I knew that it had a transfer case or related issue as it will not move in any gear. Now that I have it in my possession, here are the specifics I know so far-

-Vehicle was taken out of service a year or more ago, so battery had died and vehicle had to be jumped. Had been started and run occasionally over the past year, but not driven.

-Transfer case switch seems to be working fine EXCEPT I can not get it to show neutral. The neutral light does work during the key on / start cycle.

-All other 2wd, 4wd and AWD settings seem to work fine and I can hear the encoder motor working at each setting.

-Vehicle shifts through all transmission shifter settings with no problem. Shifter is not loose as they are when shifter linkage is broken.

-Vehicle engine will rev and TB will roll freely with transmission in Drive. All appearances are that the transfer case is stuck in neutral. This is how I was able to transport it 100 miles from purchase point to home...was able to winch it up onto a car trailer without needing to remove driveshaft.

-In my admittedly limited review of the forum so far, best thinking seems to be that it is the TCCM or a mechanical problem within the transfer case. I have access to 2 good pull-a-parts and am inclined to get a TCCM to try it at this point, but would like to hear thoughts about anything else I should check or how I can pin-point the problem.

-There are no service 4wd or any other lights on. I have a basic scanner and am comfortable digging in to mechanical issues. Less comfortable and knowledgable on electrical stuff although no problem trying with some clear direction.

So, transfer case appears to be stuck in neutral but switch does not/will not show a neutral light. Encoder motor at least makes a noise as though it is working/moving at each setting. Vehicle revs but will not move in any gear.

Sorry for the long first post, but I'm anxious to start enjoying my Trailblazer and hope to get it on the road by this week-end. Thanks for any guidance!
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Old 05-17-2017, 12:02 PM
sportsfan10 sportsfan10 is offline
Junior Member
2004 Chevy TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: May 2017
Location: Greenville, SC
Posts: 2
Should be in 4.2L I6 section

Sorry - posted this to the wrong section. TB is a 4.2L I6.

Also, additional info...vehicle will roll in R and all forward gears. Will not roll if transmission is in Park.

Thanks for any guidance and direction...
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