Thanks for the reply, I did drop the pan and changed the filter before the trip, but it was not flushed, just drained. I have been driving it to work all week and just today, Thurs. it started upshifting hard on the way home in all three shifts. How can I get the code checked, is this a dealer only scanner? If PCS is the problem, how hard is it to replace, would I need to remove the valve body?