Shift Solenoid
 

Looks like the shift solenoid (2-3) has failed on one of my HHRs.

There should be 19-31 ohms resistance between the +12V line and the control line to the solenoid, but there is only about 3 ohms (which is probably the wiring resistance in the harness). This was checked at the connector to the TCM.

When I disconnect the harness at the transmission, the resistance at the TCM connector jumps to infinity. Which indicates that there is no short in the harness, the problem is inside the tranny.

The part is cheap ($20) but requires a lot of labor (around 7 hours) because the side cover won't come off without dropping the cradle and tranny. I am going to do it myself because it would cost too much to have it done and its not difficult, just time-consuming.

There is actually a video on youtube where a guy doesn't drop the cradle, but just pulls the cover off the trans enough to get at the solenoid. Don't know if I want to try this first.

My question is: Should I replace the 1-2 shift solenoid and the TCC solenoid while it is apart? anything else I should replace?

Thanks
Steve

Anyone have the part number for the TCC Solenoid?

Rock Auto is showing a bunch of different parts and I want to be sure I get the right one.

Thanks
Steve

You don't have to drop it all the way. Just tilting it should work. at least I think that's what the book says.

Oldblue, I have not found any videos showing dropping the transmission a bit and removing the cover. What search terms did you use? Any links to the videos?

Donbrew, you are correct that the service manual says to tilt the transmission until the cover comes off.

I like the transmission solenoid kits but I'm not sure who makes the parts. I would like to stick to name-brand (preferrably AC Delco) parts since so much labor is involved.

Steve

Another question:

Since the transmission has 200K miles on it, I probably should drop the pan and change the filter?

Steve

Makes it lighter.

Are you working with a P07xx code? should have one if a solenoid is bad.