I am attaching the testing that you will need to run through to confirm this. The P0700 is just telling you that there is another DTC with the trans controller. However, you are correct that the PCM is the TCM on this vehicle so that means it wants you to address the other DTC.
This P1603 is telling you that there is an internal issue with the PCM or the fused ignition has failed.
https://www.2carpros.com/articles/how-to-check-wiring
Please run through this material and let us know what questions you have but I suspect you are going to have to replace the PCM.
Images (Click to make bigger)
SPONSORED LINKS
Thursday, May 20th, 2021 AT 5:55 PM