2005 envoy SLT 6 cylinder - Team Camaro Tech
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post #1 of 4 (permalink) Old Oct 15th, 14, 07:05 AM Thread Starter
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kevin
 
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Location: virginia
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2005 envoy SLT 6 cylinder

the code reader shows I have a "shift solenoid A malfunction".
I see several listed, but have no idea which one I need.
how do I determine which transmission I have to order the right part
flat tire is online now  
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post #2 of 4 (permalink) Old Oct 15th, 14, 11:07 AM
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John
 
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Re: 2005 envoy SLT 6 cylinder

All the TrailBlazer/Envoy offerings used the 4L60-E model transmission - except for the SS option TrailBlazer (4L70-E) ...

The 'Solenoid A' is the low/1st mode activation for the trans - this signals the trans to engage low/1st when the TCM grounds this circuit.
The matrix for the two (A & B) solenoids is as follows;
Solenoid activated = Gear
A = 1st
A&B = 2nd
B = 3rd
None = 4th/Overdrive

The solenoids are supplied 12vdc by their feed wiring and then engaged by the TCM via grounding of the units - this ground signal is pulsed by the internal circuit to modulate the shift quality dependent on various data inputs from the ECM of engine load/dynamic.
If there is a problem you will usually feel a noticeable difference in the trans shift modes and qualities while driving.

So either your 'A' solenoid is
a.) stuck or there is dirt/debris in pintle/orifice
b.) not getting a modulated ground signal from TCM due to wiring or ???
c.) the coil has failed

The coils are pretty inexpensive, compared to other trans parts , and aren't to hard to replace - BUT ... be sure it's actually a failed solenoid causing the issue or you're wasting your time.
If the trans doesn't have a good service and maintenance history I would suggest a fluid & filter change before spending a lot of time and money chasing other things ...
While you're in there for the service you can check solenoid connections and for 12vdc feed - BUT, do not attempt to ground or activate the solenoids without a dummy load or you will take out the TCM!

Hope some of this helps.

ps: I have a 2003 TrailBlazer EXT with the 4.2/4L60-E and love that vehicle.
Approaching 200K and LOTS of hard use (towing, offroad, just fun bashing ...) and it is still hanging in there

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post #3 of 4 (permalink) Old Oct 15th, 14, 11:16 AM Thread Starter
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kevin
 
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Re: 2005 envoy SLT 6 cylinder

thanks for the info.
there is nothing noticeable when it shifts. the check engine light came on one day and went off two days later. it stayed off for 3 weeks. then came back on sunday and went off Monday.
the car only has 60K miles on it and the transmission fluid is still bright red and has no burnt odor
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post #4 of 4 (permalink) Old Oct 15th, 14, 11:34 AM
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John
 
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Wink Re: 2005 envoy SLT 6 cylinder

The TCM and ECM are "talking" about something they don't seem to 'think' is quite right.
You could pull 'Pending' code(s) with a scanner and see if there's a consistent issue, just not bad enough to set MIL yet ...
Could be a solenoid getting 'lazy' or some minor debris in system.
I would encourage a wiring once-over to be sure there are no 'iffy' connections or other damage from road debris or ???

If the trans hasn't been serviced in that 60K then I'd encourage you to do a flush, then drop pan and replace filter
These are great transmissions, but like good fluid and frequent (40~50K max) servicing to live long happy lives

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