Ok was driving my 97 Breeze last night when it jumped into limp mode while driving home. My check engine light has been on since I changed the headgasket... I checked the code & I have a code 66 which is for the TCM. Anyone know what might have gone wrong?

Started up the car this morning after gettting it home last night & now it runs & shift just fine like nothing ever happened?

TCM's fry themselves all too often. Probably the module itself.

Well I checked & cleaned up all the grounds & connections under the hood, then I left the battery unhooked overnight. Then the next morning it's been driving great ever since. I think I'll go get another tcm just to have on hand, plus it wouldn't hurt to change the fluid & filter since I don't know when it was done last...

Great idea, doing that stuff first! Yep, and you can't change the fluid and filter in these Chrysler FWD transaxles too often...