I have a 2010 Flex SEL Ecoboost that has exhibited a ton of issues.
I've had frozen rear caliper.
I've had both primary o2 sensors die
I've had the water pump go out.
I've had a cam advance solenoid fail.
I've had both turbos fail.
And the latest in all of this mess is the transmission only has 5th gear. No others are working (unless you count neutral not doing anything as working).
So, some background. The solenoid, both turbos and the trans all happened at the same time. Great way to start the year. I dropped the motor and trans out of it, fixed everything, and put it back in.
As part of having the engine out I did test the TRS and it failed so I replaced with new. Upon removal I also pulled the valve body and cleaned it all up and verified all seals and filters for it were in ok shape.
Once back in and all the connections verified I went to pull it off the rack to align it (pulled front subframe so needed to align). It was then that I discovered that I had no reverse. Tapping the gas resulted in a surge in RPM to 5K (at least the engine sounded better).
I pushed it off the rack and put it up on stands to run through the gears, and it was then that I discovered that I only had 5th. Engagement of 5th took some time as well. I do not have any codes other than when ABS and traction control flips out which is something I normally see when running a car with all four wheels in the air.
So I pushed it back onto the rack, dropped it all out again, and ripped the trans off.
I had a theory that it's either the torque converter or something in the trans, but sadly I do not work on automatics.
I have dropped off the trans at a shop that does rebuild automatics, and they just called. For 120K on it they said it doesn't look too bad, but there's also no smoking gun.
Regardless I am having them refresh the trans and I will be installing with a new torque converter just in case.
The reason I am posting this is because in my searches I have not found anyone else that has had these problems so hopefully this will help others. Update as soon as I have the trans back and everything back together.