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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?
$06ff is the error
Does the ECM respond to any requests? Can you get the part number off the ECM?
Would look like the attached in the tune.
Attachment 24567
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.