When we install a new ECM, the VIN isn't written, and the immobilizer is in what I call open enrollment mode; in other words, it will automatically accept the immobilizer key you install in it, then do this for both keys, then it will close enrolment, or you can exit it by a chicken dance.
Also, our VINS are not written into it, we have to write the VIN in, but it doesn't affect running.
It just helps the scan tool ID what it's seeing.
The customer needs to clear all codes, then crank or try to start it and see what codes show up.
There is a WIN module by the key that has a history of giving trouble.
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