if you need a new ECU you can get one and have it VIN programmed for less than 1K.
the flashing and such is controlled by the FCM I think. I wont specualte on how to fix as IDK but I can connect you with the peeps for a new ECU if you need want that.
this is the problem with the MODERN vehicles. once they get old, some fixes are so buried in modules and wires and code that unless you hav e the proper diagnostic tool, in this case starscan or newer, you are dead in the water.
does anything change when you reset adaptives?
is any code thrown? CEL?
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