Starts in 2nd, wont shift into 3rd

1995 Mitsubishi Diamante - Kelley Blue Book

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1997 Mitsubishi Diamante - Kelley Blue Book

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change trans oil and new filter if problem still there it most lickely the shift modual

Yes you most likely need to overhaul the tranny.

The best thing to do is check the transmission fluid, vehicle in park engine warm and at operating temperature,check the transmission fluid, at the transmission dipstick,if you are in the marked range the fluid is not the problem if the fluid is dark almost black(which should be very red) then the transmission is burnt,which a replaced transmission is the solution,

Best Manuals You just go to the link I attached I'm sure you will get the solution of your problem

my 02 mitsubishi diamate transmission is in a fail/safe mode how do i get it out of that mode?transmission only works n 2nd,3rd ,park,nuetral,&reverse

im not sure the problem. but i took the ecu and tcu outta mine and it worked for a lil wile. then it was fixed for good then it wont shift outta 3rd when od is off and it stays n 3rd when od is on. any help would b great.

Doesn't sound like a simple fix. I would suggest having it serviced.

The transmission needs to have the filter and fluid replaced.

Sounds like you have a solonoid out in your transmission. No simple fix for this. You will more than likely have to drop the transmission to replace solonoid.