2010 Chevrolet Malibu LT 4 Cylinders B 2.4L FI DOHC 146 CID
MH-8 6 speed automatic transmission-Reverse gear and 3rd gear doesn't engage-a check engine code showing one of the solenoids is stuck.
The pressure control solenoids were filthy from old fluid- I believe this is why it became stuck.
I've cleaned the solenoids well, but I've run into a problem. When I removed the solenoid assembly from the computer part, some of these yellow plastic pieces fell out of place. I have put them back in place, but I am left with this concern about some O-rings.
In the image you are looking at one side of the solenoid assembly-
It has these little O-Rings with a strange reddish membrane, on 3 of them. 1 of them has no membrane. It was either lost or that one by design doesn't have one-either way I do not know.
I imagine the 4th one is supposed to have the same red membrane. If so, where can I find a replacement?
I've found this kit that will allow you to service and repair most, if not all, of those valves and update the valve body to correct the issue, preventing reoccurrence. It includes new diaphragms and O-rings.