I noticed that after the j-mod and fluid change to Mercon V, that when I had the trans in neutral, I could hear what sounded like a buzz coming from the trans. Kinda sounded like something was trying to engage but couldn't quite do it. Like a teeth skipping-type sound. Not to loud or harsh, but seemed to be at a constant. Put it in Park last night after taking it for a drive, and noticed the same sound, only not as pronounced. Wtf is that? The valve body going south? It still shifts fine and no O/D light, but I did get a CEL last night, so I reset the comp. and took it for a test drive. That's when I heard it in park when I got back from the "re-learning" session. Is this a huge problem, or is this normal? I also noticed that the key likes to get stuck in the ignition switch occasionally. I told my wife to move the shifter down through the gears, then back to park, and the key popped right out. Is this the MLPS going to? I noticed that there is a little play in the lever when it's in park, so it may just be linkage. Have to crawl under it and see. Just wanted to know what the deal was so I know if I have to save money or not.
These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.