4 wheel drive won't disengage - 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 4.2L I-6 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 09-20-2009, 12:09 AM
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David11946 David11946 is offline
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4 wheel drive won't disengage - HELP!

Hi guys,
I took my '02 Trailblazer to the carwash today and when they finished washing it, they parked it. I get in and start the car and when I reversed out of the parkijng spot, it sounded like it was in 4 wheel drive. I heard clicking going on under the car and the car had no power. It actually bucked and lurched when I tried to speed up to about 5-8 miles an hour. So I had the car wash guys look at what they did. They said it was in 4 wheel drive and would not disengage. Also, the "service 4WD" light on the dash was now on. Now they have the truck until Monday (being this was a Saturday afternoon and nothing is open).

Can anyone tell me what might be the problem? The dealer thought it might be the 20" rims that were on the car when I bought it. Might he be ducking a pre-existing problem that he knew about and didn't tell me? The car was fine during the 6 days that I've had it.

Thanks in advance for the help guys!
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  #2  
Old 09-20-2009, 12:19 AM
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MajesticLT03 MajesticLT03 is offline
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20's dont effect the 4wd system


either the switch went bad or an encoder motor went south (maybe got blasted by water?)
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  #3  
Old 09-20-2009, 12:33 AM
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They probably fiddled with the switch if they wiped off the dashboard.

If you just get in and start the car now, see if the Service 4WD light will go out. And then see if any of the mode lights on the selector switch are lit, like 4HI or 4LO. If it got put into 4LO, then the ONLY way to get it out is to be in NEUTRAL (not drive or park) and be rolling less than 5 MPH. This is all in the Owner's Manual but if the vehicle's new to you, maybe you haven't sat down with it to read it cover to cover.

I've had water take out the encoder motor function, and another time the front axle actuator. They dried out in an hour or two of driving around Borrego. It stinks to be stuck in 4LO on pavement, and it could break things to force it to drive around corners. You did right by parking it, but it might be OK on Sunday. I'm in North County - where are you? I'm going to El Cajon in the morning to get some welding done, and then on an offroad trip, but it's not out of the question that you can get this working without the dealer getting involved.

To blame the rims, when what REALLY COUNTS is the outside tire diameter, is just INSANE. Dumb dealer guess. I'll send you a PM.
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Old 09-20-2009, 02:02 AM
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Quote:
Originally Posted by David11946 View Post
...They said it was in 4 wheel drive and would not disengage..
Why? Maybe they were trying to do AWD donuts?
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  #5  
Old 09-20-2009, 02:36 PM
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David11946 David11946 is offline
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Thanks guys, I really appreciate the help you given.

I'm in Chula Vista, Roadie. Sorry that I wasn't online when you replied. I'm new to the area and all I know is that it's a Chevron carwash next to a Target store in Chula. I'm still learning the raod names here after 3 weeks. I will try to go down there and try your instructions. I post the results later. I'd hate to crowd your Sunday off with a 'distress call'.

Thanks to all.
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Old 09-20-2009, 06:22 PM
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I just got back from the carwash where my TB is. They've tried pulling fuses and they pushed the truck, in neutral, under 5 miles and hour to get it to disengage 4 wheel low. I didn't work.

The truck is, however, in 4 wheel hi now. All the undercarriage clicking noises are gone but you still hear the trans running as if it's in '4 wheel drive' (so we guessed that it was in '4WD Hi' now).

They connected an OBD-2 scanner to it and got no readings but the 'service 4WD' light on the dash is still on. Whats more, none of the 4 wheel drive switch indicator lights are lit. When the engine is first started, all the indicator lights on the 4WD switch come on for a moment but then they all go out so, there is no way to visually see what type of 'drive' you are actually in (except for the transmission gear indicator above the column on the dash). Nothing has worked so far...

Needless to say that I could possibly pull my hair out before Monday, they said that the owner of the carwash also owns a ASE cert. shop and it will be towed there tomorrow. (Geez it's tough to be stuck in SoCal. with no car).

Well, thanks for listening. I appreciate the advice that you all has given thus far. Enjoy your weekend, guys.
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Old 09-21-2009, 01:06 AM
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Just got home after a day in the mountains near Jacumba. Anyway, I think you have the symptoms of the 2002 TCCM (transfer case control modules) that fail to wake up and initialize properly when you turn the key on. Sometimes the dealer can fix them with a reflash. Sometimes, the earliest models had flaky hardware and the module ends up needing replacement. Run a search for TCCM for a discussion of this historical issue. Usually you need a dealer with a high end tech tool to diagnose it for certain, although you won't need the dealer to install a used TCCM if you find one.
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Old 09-21-2009, 08:11 PM
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Along with Bill's suggestion, I'd like to toss in my

The problem started with a truck wash, IMO, most of out 4x4 problems are a result of water intrusion into the electrics. IMO, gm did not do a good job of ensuring these circuits are water tight.

It might work when things dry out. But, the water may have damaged circuits and parts may now require changing or repairing.
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Old 09-21-2009, 09:29 PM
Chord06TB Chord06TB is offline
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Quote:
Originally Posted by the roadie View Post
Just got home after a day in the mountains near Jacumba. Anyway, I think you have the symptoms of the 2002 TCCM (transfer case control modules) that fail to wake up and initialize properly when you turn the key on. Sometimes the dealer can fix them with a reflash. Sometimes, the earliest models had flaky hardware and the module ends up needing replacement. Run a search for TCCM for a discussion of this historical issue. Usually you need a dealer with a high end tech tool to diagnose it for certain, although you won't need the dealer to install a used TCCM if you find one.

Same thing happened to my 06 when I bought it used a month or so ago. You hit everything on the head my truck was very slugish and would clank when I turned so I took it to the GM dealership where purchased. They fixed every little problem I had in a few days, and I left happy
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Old 09-22-2009, 07:56 PM
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David11946 David11946 is offline
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Thanks for the input, guys.

I finally got my truck back. The guy that owns the carwash also owns an ASE cert. shop so they paid for the 40 mile tow. They soon found out that it was a problem that the dealer knew about and didn't tell me. There is a module on the transfer case itself and the mechanic showed me where it had been recently removed (I only had the car 1 week). What the dealer did was manually spin the motor to the '2WD hi' mode and sold me the car. I called the dealer and he says he will fix it. I hope that he has the $500 part ready.

I was told by a few mechanics that I can possibly sue him to replace the part since I had the car only one week and he failed to tell me about this. Is this true (I mean according to Calif. lemon law)?

Thanks
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