new trans was put in the car 4k miles ago
trans failure limp mode comes on dash on 2001 Jaguar Vanden Plas

There is no power engine runs at idle only, Cycle key and system resets and all ok. car has 114k, new trans not rebuilt 4 k ago, feels much more like a relay or harness connection that a hard part problem.
where is the common failure location?

Asked by for the 2001 Jaguar Vanden Plas
have whomever worked on your transmission inspect it...a possible warranty issue.
Thats it?
Now ideas but replace it?