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Hi Im David,
The P1636 code indicates the Powertrain Control Module (PCM) has lost communication with the inductive signature chip. you need to get it back to the dealer and have them do their job and rechip the key to the pcm.
do you still need assistance?
checking in to see how its going
The code P1636 is for a faulty PCM (Engine Computer). If there are no other trouble codes, the PCM will need to be replaced and the keys to the vehicle reprogramed to the vehicle. If the code was not there before they replaced the PCM, they will need to make sure the new PCM is not internally failing. They also need to make sure they have properly programed the PCM to the vehicle and that it is the proper (correct) PCM for your vehicle.
Glad you found the problem, with your Mustang. I do work around a lot of mechanics as I call them at my dealership that basically through parts at the vehicle instead of actually locating the problem. Yours needed actual hands on as we have seen a lot of wiring connector pin fitment issues in these 2010 and up Fords and Lincolns.