Hi if im swapping out a faulty ecu with another stock Ecu from another 2.2 do I have to reprogram it. Any help would be appreciated.

 

Yes it has to be reprogrammed as GM ecu's are blank. What year is your car? Cause you might get it replaced under emissions warranty.

For me, I'm hopin to either get a spare to tune or just get a "Hide a tune" on my current.