Shift Lock Issue- Need part # & diagnosis 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 > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 02-22-2010, 02:58 PM
dean w dean w is offline
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2005 Chevy TrailBlazer LT
Midnight Blue Metallic 4.2L I6 4X4
Join Date: Feb 2010
Location: hickory, nc
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Shift Lock Issue- Need part # & diagnosis help

Have a 2005 TB, issue is the shifter won't shift out of park. I have read for 2 days all the posts that I can find. This is what I know

Fuse 25 & 27 are good-used a multimeter
tail lights work when I step on brake pedal
key comes out of ignition lock as it should
I can get shifter to move if I use the override switch on side
I can not hear any clicking from the shifter solenoid when I step on the brake pedal with engine running

I have checked for voltage & ground at the a/t shift lock solenoid switch

With car running I have the following votage & continuity readings;
1. light green/black wire & dark green/black wire have battery voltage

2. black wire is grounded (used multimeter to confirm)

3. red wire - can't remember if I had voltage here or not

4. yellow wire - no voltage or ground

Is there any other tests that I can do to confirm that the shift lock control solenoid is the issue? If not, can someone tell me the part # for the shift lock control solenoid? Dealer quoted me $93. Also is there a thread showing the installation of the solenoid? Thanks in advance
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  #2  
Old 02-22-2010, 03:17 PM
christo829's Avatar
christo829 christo829 is offline
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2004 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
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You might want to check the brake switch itself. I don't have the
wiring diagram handy, but on my '98 Lumina, the brake switch had
separate contacts for light circuit vs. safety interlock. The switch might
not be closing to activate the solenoid, but just going by the
brake lights might not be a complete diagnostic.

Granted, this doesn't rule out the solenoid failing, but you might
also try putting power to the solenoid and see if it reacts.
Check for that voltage on the red wire. If I had the wiring diag. with
me I might be able to tell you which wire is supposed to carry
voltage when the circuit is activated. It might be that the red
should carry power, and the yellow is the coil trigger?...can't be
sure, but see if you can remember whether you had V or not on that
red. Might tell you what's what.

Did you check Compnine.com for that solenoid? Parts4Chevys.com
or GMpartsdirect might have some options for you as well.

Good Luck!

Chris
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  #3  
Old 02-22-2010, 03:23 PM
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KNBlazer KNBlazer is offline
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2004 Chevy TrailBlazer LS EXT
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try pumping the brake pedal in a rapid tapping .... I've had the same problem on and off for the past 3 years... so then when you apply the brakes, you don't hear one click? you should hear one in the steering column, I do believe...
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Old 02-22-2010, 04:05 PM
dean w dean w is offline
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2005 Chevy TrailBlazer LT
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I hear the clicking in the ignition switch, but not at the shift solenoid.
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  #5  
Old 02-27-2010, 02:45 PM
dean w dean w is offline
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2005 Chevy TrailBlazer LT
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Fixed

I checked the brake switch & it was fine. Issue was the shift lock solenoid. I had power going to it, but it wouldn't energize. Due to tight funds, I simply removed the solenoid (comes out with 2 small torx bolts), but left the electrical plug connected. That way the ignition key will release.


Now I can move the shifter w/o pushing brake pedal. Thats' not an issue for me, that used to be the way all a/t functioned.

Anyway, if someone else has the same issue in the future, this is a way around not spending $100 for a new switch.
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  #6  
Old 02-27-2010, 08:34 PM
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christo829 christo829 is offline
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2004 Chevy TrailBlazer LT
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Glad you were able to get around the failed part. Is the solenoid coil
shot, or just a jammed plunger? Just wondering if you could resurrect it,
though since you've bypassed it, obviously not an issue...

Either way, glad you were able to get yourself out of park!

Cheers-

Chris
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  #7  
Old 02-28-2010, 12:07 AM
Wex Wex is offline
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2006 Chevy TrailBlazer LS
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Please take a pic of this solenoid next time you are down there. This would be handy to know.

On my prior vehicle I intentionally disabled the shift interlock to provide a one second advantage against zombie attack. It was a column shift and was all good. My Trailblazer on the otherhand, I would be afraid to do it because I might accidentally shift it out of gear if I crawled from one seat to another.

Still would be cool to know where the part is in case one day it failed. a workaround could be done on the spot.
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  #8  
Old 02-28-2010, 12:20 AM
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the roadie the roadie is offline
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Not my pic, but found in a short search.

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  #9  
Old 02-28-2010, 03:29 PM
dean w dean w is offline
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2005 Chevy TrailBlazer LT
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Quote:
Originally Posted by christo829 View Post
Glad you were able to get around the failed part. Is the solenoid coil
shot, or just a jammed plunger? Just wondering if you could resurrect it,
though since you've bypassed it, obviously not an issue...

Either way, glad you were able to get yourself out of park!

Cheers-

Chris


Chris, the plunger works fine, the solenod is shot. If someone has an old one they will send me, I'm sure that I could disassemble it & come up with a cheap fix.
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  #10  
Old 02-28-2010, 03:34 PM
dean w dean w is offline
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2005 Chevy TrailBlazer LT
Midnight Blue Metallic 4.2L I6 4X4
Join Date: Feb 2010
Location: hickory, nc
Posts: 5


The 2 torx screws are accessed thro the shifter lever opening on top, then you must turn the solenoid sideways & pull it out the RH side opening. I left mine connected & simply placed it under where the connector is. Lots of room.
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