Check engine and AT light on

Question by purpleneko posted 11 months 1 week ago in 2006-2010 (1st gen)

Check engine and AT light been one for about a month now.    Started with slight jerks when shifting from park or neutral into drive or reverse; getting worse.  Stays in 3rd gear; mechanics say its not going into overdrive.  Changed transmission fluid and filter but lights still on.   My research on internet match symptoms to either the solenoid or automatic transmission module (ATM) needs to be replaced or fixed.  Read somewhere on net to try using manual mode to troubleshoot problem.  If manual shifting works, then it would confirm or rule out something but don't recall what the article said.  So yesterday I used the manual shifting and I was able to shift from gears 1 through 5 and engine did not rev. and both check engine and AT lights turned off!    Can't find that article/website info to read again. Does anyone have info on this?  Help needed in Hawaii!