faulty 2-3 shift solenoid - 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 > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 12-26-2009, 01:31 PM
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nstyvoy nstyvoy is offline
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2002 GMC Envoy SLE
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faulty 2-3 shift solenoid

Hi everyone...

Does anyone have any experience in replacing the shift solenoids in the transmission??? I had the computer scanned and it specified that the 2-3 shift solenoid was the issue. I have the new part and the tranmission oil pan off, but unfortunately there doesn't seem to be any specific markings to tell the three solenoids apart.

I'm trying to find any info on distinguishing the 3 apart from each other... whether it be from personal experience or, even better, a diagram of the transmission.

Any help would be much appreciated!!!
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  #2  
Old 12-26-2009, 04:10 PM
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Took me a few min but i gocha !

http://www.ls1tech.com/forums/automa...d-b-460le.html

Scroll down a litte and there is a pic of the valve body with the solenoids circled! Its Number 2

Also,If u have an ohm meter you can measure the resistance of them. Which ever has a number thats WAY off then whats most likely the one !
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  #3  
Old 12-26-2009, 07:02 PM
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Thanks for the info... I really appreciate all the great member feedback at Trailvoy.com over the years!!!

As it turned out, we had tried what you suggested and measured the resistance of the two possible solenoids. Unfortunately, they both measured at 19 ohms, and the new one measured 20 ohms so it wasn't a clear distinction. The part is relatively cheap... just under $25 a piece at the dealer (My brother works for a Chevy dealer, so I got them for $15) and I was able to get a second unit so I changed both just to be safe.

While we had it apart, we did a tranny filter. My Envoy has 121,000 miles on it, so it was more than time (I regret to say the only work I've had done on the transmission was a power flush @ 65k).

I did want to mention, in case there are any other members out there who run into a similar issue, that it was quite simple to do yourself. It seems like it would be daunting, but the only real issue is that it is a VERY messy undertaking. The oil pan gets hung up on the shift linkage, so dumping it on yourself or the floor is inevitable!!! Also, my truck only had one code come up on the computer (faulty 2-3 solenoid), so I started there. I noticed other members had multiple codes that led to faulty wiring. Mine, only having the single code, ended up being simply the solenoid. Also, I found that the 2-3 shift solenoid is a common problem related to the TB/Envoy after doing a lot of internet searches.

The whole process shouldn't have taken more than a couple hours, but I had to go out for additional parts so it was longer. The total cost was $60 ($80 retail) for 2 solenoids, aftermarket tranny filter w/ gasket, and 5 qts of Dexron III. I called the dealership and they would have charged me around $100-$150 for labor plus parts and that didn't include the transmission filter change (which normally runs about $129) or the fact they probably would have hit me up for the diagnostic test ($99) I had done for free at Autozone.

Hope this post can help!!!
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  #4  
Old 12-26-2009, 09:21 PM
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Haha, glad to hear you got it fixed!

You should have put in a shift kit while u were in there

That's weird about the Resistance, Usually there is a pretty drastic difference between a broken one and a new one! Hmmmm....

Oh Well
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  #5  
Old 12-30-2009, 09:24 AM
Roamingdoc Roamingdoc is offline
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Question

Let me inquire and bump...

Have 02 TB (4Whldrv) with about 130K.
Have always maintained Trans with Amsoil Synth. Change about every 25K with Filter etc... "Just" (10K ago) did full 'drain' as suggested on this forum (at the trans cooler in front - was successful, got lots out to new fluid showed)

Now, upon 2 to 3rd shift, hear "whirring" sound from trans... it doesn't "seem" to delay the shift but I'd bet it is.

DOES THAT SOUND like a solenoid issue? Does NOT do it in any other gear shift 'but' on occasion WILL do it upon starting and 'placing' car into gear from Park.

Many thanks for any insights and help. Greatest Forum every. Happy New Year!!
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  #6  
Old 12-30-2009, 09:41 AM
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nstyvoy nstyvoy is offline
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Right before I had the solenoid issue, i would notice that the transmission would seem to slip during up-shifts momentarily upon accelerating before the truck was completely up to regular operating temp.

Not long after (a week or two), the "check engine" light came on. At that exact moment, the solenoid stopped working and the truck would not go into 1st gear or overdrive (4th).

You will absolutely know for sure when (if) the solenoid goes because there will be a clear, obvious issue with the operation of your truck.
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  #7  
Old 12-30-2009, 09:42 AM
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nstyvoy nstyvoy is offline
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Africandude,

I am unfamiliar with the shift kit you spoke of... what are the benefits???

Thanks!!!
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  #8  
Old 12-30-2009, 11:03 AM
Roamingdoc Roamingdoc is offline
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Thanks nstyvoy...
So "did" you notice any slight noise as your car shifted from 2nd to 3rd 'before' it went completely out?

The noise "almost" sounds like the sound you get changing out CDs from the multiplayer in the dash (no, it is NOT that happening)... and I thought almost immediately when my wife said, "There's that sound I've been telling you about" that it was a "stuck" solenoid or a slow 'moving' solenoid.

ANYONE notice sound with this 2-3 solenoid going out? Thanks again nstyvoy.
I have a good Tranny guy and my F-150 is there now for some 'rear end' work so I'll ask him as well... take care all.
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  #9  
Old 12-30-2009, 11:26 AM
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nstyvoy nstyvoy is offline
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I wish I could help with the "noise", but I rarely hear anything over my stereo... HAHAHA!!!

Good luck though...
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  #10  
Old 12-30-2009, 11:29 AM
Roamingdoc Roamingdoc is offline
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