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Hello and welcome to Justanswer,
Unfortunatelly your dealer is correct, in order to use the used unit you would have had to download all the information from the host unit so it could be loaded into your Axiom. The only way to get the problem resolved is to replace teh unit with a new one flashed for your car.
Is it possible to find a used Axiom in a yard and send a locksmith out to flash it while in the vehicle?
That would likely work if its still in the car, the PCM has to be flashed to match the vin number it came out of. That where your having a problem with the one you have ,because you dont have the vin it can not be programmed to match your car.
According to the locksmith that was playing with the used computer I have, he said he was able to get the VIN number that's stored in that computer, but he wasn't able to reprogram the computer to keep my suv's vin/
I guess my question is, Are we basically erasing the VIN info from the vehicle it's in therefore having a clean ECU to be preogrammed into my vehicle?
In most cases it will not erase and thats why you usually have to go with a new one because it will come with your vin number in it .
bummer, teach me to buy on eyear only vehicles with outrageous parts pricing