Car will not go faster than 15MPH

Okay. You have a lot going on here with these codes so if we are going to focus on the reason for limp mode then more than likely you have the wrong TCM in the vehicle.

Did you just recently purchase this vehicle or just replace the TCM?

I am attaching the info below on this issue because this will explain what is happening with this code.

With this being a CVT, it requires a certain software program and I suspect it is the wrong TCM or a TCM that has a different software in it from a differently equipped vehicle.

It would also be helpful to scan the CAN using this guide or get a scan report from the dealer and that will tell us what software and VIN are programmed into the TCM:

https://www.youtube.com/watch?v=InIlnsjOVFA

Clearly the TCM is telling you that it has a mismatch configuration so again, I suspect you or someone previous to you changed this with the wrong part.

Let me know if there is more to this story. Thanks

Did you use a used transmission? Did you confirm this transmission was out of another CVT vehicle? There are a lot of vehicles that use the 2.4L so do you have the VIN of the vehicle this transmission came out of?

I am guessing that you got a different (non CVT) transmission and tried to use the TCM out of that vehicle as well? If that is the case, you are getting these codes because all the other vehicles modules are expecting to see a CVT transmission, and you replaced it with a different one which is why the mismatch code is coming up.

This could work but you would have to change the sales code and do what is called a reconfiguration. By doing this, you are changing the way the vehicle is equipped and then telling the vehicle about this change. You can't just change the parts and the computer on this vehicle like you could on the older vehicles.

Do you have the VIN of the vehicle that this transmission came out of?

Okay. Let's start with the VIN of the other vehicle because your vehicle is telling you that the calibration in the TCM is not correct. So, can you contact the dealer and ask if they ran a report called a scan report and if you can have a copy of it?

This is going to show the software number that is the TCM which I suspect is going to be wrong for this replacement transmission. Take a look at the attachment below.

What this is telling you is that there is a software calibration in the transmission which the TCM needs to recognize. When it doesn't it sets this code.

You should be able to do a relearn process and it will correct this but if they did this relearn and the code is still there, it is not possible to relearn this again.

Which means it was learned to the previous vehicle and cannot be programmed again. At this point you would have to replace the valve body inside the transmission and then have it programmed to this vehicle.

So, the part number of the actual transmission may be the correct one, but the problem is this was already programmed to another TCM.

There may be an issue with the wiring connector, but I don't see this causing these codes.

That can work. Below is the info from the manual on how to do that.

Thanks

Okay. That is the VIN off the transmission so this points us back to the previous plan that if the valve body is learned to the TCM that these TCM codes should go away.

At this point, changing the valve body from the other transmission is the best plan of action.

Thanks for the update.

Yeah. That is fine. That is the same transmission as yours. I am pretty sure you can do it in the vehicle. I don't remember ever doing one on a Compass but you just need access to that pan.