Hi everyone - I have a 2009 civic which I like a lot. I am the second owner - it has about 104K miles on it, most of them mine. This weekend the check engine light and flashing D light came on. And it also felt a little funky while I was driving and shifting. I searched this forum pretty thoroughly and read the other posts, so I understand this is likely a pressure switch issue (?), based on the code my mechanic read: PO843. This garage likes to send transmission issues to Aamco across the street, so that’s where my car ended up. According to Aamco, it’s not a switch issue because the transmission fluid looked very black and burnt and the car is skipping second gear when it shifts. They say I need a new transmission for $3200. Does anyone here see this differently or have any other recommended next steps? I have no reason not to trust the professionals who have shared this advice with me but I am not super knowledgeable about cars and frankly $3200 is a big chunk of change. I Appreciate any advice anyone can share. Thanks!

Thanks, everyone! Yep - you guys were right: a new switch and changing the fluid twice seems to have solved the problem. I realty appreciate the forum’x good advice.