can u reprogram used ecm to my vin?
 

who can program a used replacement ecm to my trucks original vin#?

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do i even need to reprogram it if it came from a truck with the same engine code?

i thinks only a tech II can do that

1. Don't need to do it, if everything is the same from truck to truck.
2. If you do need to reprogram, Yes you'll need the Tech 2, but you'll also need to tap into the GM programming system.

IIRC you can do it with EFI too