I do know that you have to divorce the one in your vehicle and then marry your new or used one in with a tech 2 scanner. You also have to make sure that the ECU or ECM you are putting in comes from a car with the same Engine, Transmission, and Year. The Vin should look similar and the closer the better according to this SAAB mechanic I spoke with.
My question is. Does the donor ECU have to be divorced from the donor Saab prior marrying it with your car?
Answer:
You do not need to divorce any module. You just enter your VIN when you get to that screen on the GM Tech2.
Think about it this way, if the ECU was completely fried it could still be replaced with a new one. The old (any old module
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