89 300E automatic will not go into 4th gear. - 1989 Mercedes-Benz 300-Class

Sounds like it has run low of transmission oil. You may be able to save it by draining the gear lube and refill with DELCO synthetic Automatic transmission fluid. Make sure level is correct. The 4th gear syncro is bad, but the Delco ATF will help.

05 Chrysler pacifica is a 4 speed automatic, next time buy a car with a 5 speed automatic

change fluid start there

USE A SCANNER TO CONFIRM WHETHER HAS ANY SOLENOIDS HAD TO DO WITH.

Well, you can push any automatic trans car in any gear except park.
As for slipping in overdrive which is 4th gear, if the trans is full of fluid, you're probably looking at replacing it to fix it.
Could be a list of things such as clutches or dirt in the valve body.

This button only makes the gearbox change from 3rd to 4th or 4th to 3rd, will not down shift in any other gear, make sure it is in 4th gear, usually above 60km, than press o/d off it should go into 3rd gear, if it does not than see a automatic specialist, it is usually a sensor, if you go to Toyota they will charge you a fair bit.

I had the same problem but eventually lost reverse. Had to get a new transmission... $2,300.00

First thing to do is check the fluid level if that ok you may want to think about having the transmission filter and fluid changed, there are other possibilities but check these first

its the ecu on the passenger side i went thru 3 trannys in 4 months and they finally looked for the problem because the tranny was under warenty and they had to keep fixing it for free