Next Generation Controller (NGC) Powertrain Control Module (PCM) Flash Process Failure: "Negative Response 0x12, 'Sub Function Not Supported / Invalid Format' Received from Security Request Download Request"

VEHICLES: 2007+ vehicles equipped with Next Generation Controller (NGC) ECU: NGC ISSUE: Flashing a NGC PCM results in an error message of “negative response 0x12 - 'Sub Function Not Supported / Invalid...