Been trying to chase down a reason for why the '03 Aviator keeps sporadically throwing a 'doesn't recognize 2nd gear' code. Thought we might have had it fixed when we added an additive to 'de-gunk' possible sticky solenoids but the code came back. Now we are thinking to replace the solenoid valve body just inside the pan with a new one.
Are there other solenoids buried deeper in the transmission? I'm trying not to blow more money than needed. I'm not familiar with the 5R55W so if any of you mechanics have ripped into one I would appreciate your thoughts. If there are lots of moving parts beyond the valve body maybe it's time for a Jasper re-manufactured unit and be done with it and get the warranty.