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You cannot just replace it unless proven faulty.
It will need to be reprogrammed and keys reprogrammed.
The Theft, dash and PCM all have to be done so they communicate with each other.
If not, you will never start the truck.
This is how the Theft system works.
Why do you want to replace it?
With out this info you will just get deeper into problems.
Good luck.
Yeah....I know all that! The system has been checked out, and the ECM has been determined to be at fault. What I need is the number off of the ECM so I can get a new one, then take it to the local Ford dealer to install. All I need is where to look....
We are always skeptical here of some one else's diagnostics without hearing the details.
Our advice is free.
The PCM is behind the passenger kick panel.
I hope you correct.
Good luck