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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 10-11-2010, 05:10 PM
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2006 Chevy TrailBlazer LT EXT
Black Granite Metallic 5.3L V8 4X4
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4x4 issue

my 06 TB EXT, just jumps into 4x4hi by it self,
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  #2  
Old 10-11-2010, 05:19 PM
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I'm not sure if this is a common issue but you should pull the appropriate fuse to disable 4x4 before the t-case is damaged.
Have you tried searching this site for your symptoms?..... there is a ton of info about our 4x4 system here.
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  #3  
Old 10-11-2010, 05:45 PM
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2003 GMC Envoy SLT XL
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This sure sounds like a wiring short, but I haven't read one like this before ... maybe someone with more experience on the forum could offer an alternate explanation. What I would do is (with the vehicle off) is cycle the selector switch for the 4wd through all the positions about 100 times back and forth to free the contacts from any corrosion that might have occured. Then fire it up and drive it and see if the problem persists.

Another thing that you could do is just replace the selector switch, as that is not something that is that expensive. If the problem persists, than at least you have eliminated a shorted or corroded switch.
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Old 10-12-2010, 08:59 PM
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Yeah, tried searching the site and nothing, will pull the fuse, thatís a great idea!
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  #5  
Old 10-12-2010, 09:02 PM
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Will also try that. Thnxs 4 idea
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  #6  
Old 10-12-2010, 09:09 PM
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Quote:
Originally Posted by linneje View Post
This sure sounds like a wiring short, but I haven't read one like this before ... maybe someone with more experience on the forum could offer an alternate explanation. What I would do is (with the vehicle off) is cycle the selector switch for the 4wd through all the positions about 100 times back and forth to free the contacts from any corrosion that might have occured. Then fire it up and drive it and see if the problem persists.

Another thing that you could do is just replace the selector switch, as that is not something that is that expensive. If the problem persists, than at least you have eliminated a shorted or corroded switch.
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Old 10-12-2010, 09:19 PM
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  #8  
Old 10-18-2010, 10:18 AM
printjockey printjockey is offline
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2002 Chevy TrailBlazer LS
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Same type of Problem

Weird problem last night...found light on 4X4selector switch (2002) blinking on 2HI (where I always keep it) still drove ok. Made mistake of switching to A4wd then back (when car off) Started car - switch in 2HI, light blinking above, light solid above 4LO car in 4LO. couldnt get car out of 4LO. Pulled 4WD fuse from block under seat, nothing, pulled both drive train fuses nothing (I think) reinserted them..car stayed in 4LO, put switch in 2HI, sitting at signal, put car in neutral, and lo and behold car switch to 2HI, now drives OK..any ideas? Will this switch while driving?! What fuse will disable this but allow car drive in 2HI...Help!!!
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  #9  
Old 10-18-2010, 11:35 AM
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2003 GMC Envoy SLT XL
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The switching back is probably easy enough to explain. If you want to get into or out of 4LO, I don't think that there is any other way than to be in neutral and stopped (or less than a couple mph anyway) ... you finally went into neutral and stopped, so it switched back. As to why it jumped into 4LO in the first place, that is a mystery ... perhaps a flaky TCCM since you have a 2002 (many were bad for that model year).
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  #10  
Old 10-18-2010, 12:45 PM
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OK, bear with me, what is a TCCM?
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