E39a checksum issue

[Inglewood2023]

I pulled the file on a 2014 Cadillac ATS 2.0 to turn off a few CEL (like an idiot i did not save the untouched file) i changed to codes to not reported and tried a cal flash. The truck flashed until the end then said it had a checksum issue and no longer will start. Is there a fix or is a nee ecm needed?

[Inglewood2023]

$06ff is the error

[Cougar281]

Does the ECM respond to any requests? Can you get the part number off the ECM?

Would look like the attached in the tune.



If that matches, I could send you the stock cal from my wifes 2015 Malibu 2.0t. 12653998 does show as compatible with a 2014 ATS 2.0t. The calibration probably wouldn't be exact, but it should work if the part numbers match.