I'm started with a charging system problem. Change alternator but nothing. I've buy a new ECM/PCM module with same serial # .
I've read the old module with the 2 calibration for ECM and TCM .
Changed with the new and start to read entire calibrations.... but.... some go wrong.
Now, the ECM failed but not the TCM ( write OK ).
I start again with only ECM calibration but Failed.
Again with SKIM disable for retrofit .... but Failed again....

What can I do now ??