Welcome to the forum. I changed the title of your post to better reflect the problem.

If you can post the nine codes we may be able to offer some advice based on them.

A common problem is that one or more of the valve body solenoids (part of the transmission) fail which prevents drive or other transmission problems. A valve body costs around US$700 and with installation is usually quoted at around $1,500.

If you need a replacement transmission these are now available as rebuilt units from various US transmission rebuilders or you may even consider a second hand low mileage transmission from a wrecked vehicle.

Seagrass

 

So I got a call from the mechanic (secretary) that they were "done" with my car. Turns out that somehow because of the issues, the car now won't come out of Park and is recommending getting it towed to the dealer. They are hoping the dealership has a better way of handling the car. The transmission they think I need is limited to this model year, so they hope the dealer has some better ways of getting a hold of parts needed. And on top of that, a new transmission would need it's module programed by the dealer anyways, so they would have to send the car that way.

I did get the list of codes though, you might be getting my hopes up with a potentially cheaper fix:
P0171 - System to Lean B1
P07400 (typo?) - Transmission Control System Fault
P0841 - Secondary Transmission oil temp sensor performance
P0965 - Pressure Control solenoid "B" forward and reveres fault
C0045 - TCM Malfunction
C0231 - ECM Failure
C0323 - A/T fluid pressure/temp abnormal
C0242 - Power Supply voltage.

So would a valve solenoid failure result in Transmission oil not flowing in the system, which is why the system overheated and shut down? Would the ECM & power supply codes make sense as secondaries, or does that point to a different issue?

And am I reading that C0045 is the TPM monitor issue? that puts it at unrelated, but I did have the tires replaced ~1 month ago, so maybe they screwed it up?

So at this point, I think I am calling AAA in the morning to get them to tow if from the Mechanic to the Dealer (Dan Perkins Subaru) and seeing what they have to say.

 

Hi,
call Wrenchrite in Branford. They did head gaskets on my older Subaru. They specialize in Subarus and are honest, talk to them and see what they say.

 

Make sure you get a flat bed.

 

I believe the code that matters is the P0965.

The C codes are communication codes that are often caused by poor electrical connections (underperforming battery, corroded battery terminals/cables, bad earth/ground connections).

I suspect the other transmission codes are a result of the P0965.

I do not recall where the pressure control solenoid B is located but if it is in the valve body AND as long as the failure of that solenoid has not caused other damage then a valve body replacement may fix your problem.

It sounds like your mechanic was out of his depth with this problem so diagnosis by the dealer might be a good (but expensive) option.

Seagrass