Why do I need to Flash my ECM?
Why do I need to Flash my ECM? In other words, flashing an ECM allows it to have the same software and parameters that it would have were it in a vehicle rolling new off the assembly line. Without reflashing, the data stream from an aftermarket computer that the other components in the car rely on will be missing or not meant for your specific vehicle. How long does it take to flash GM PCM? GM Flash Updates The flash procedure can takes from a few minutes up to an hour depending on the file size of the software you...