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I am duking it out with mode 45 as well (2006 CM849a).
As I am at the starting line and start to build boost, the ECM enters mode 45 and limits the command to 115 mm3. Mode 45 exists until I breach 25 mph.
I discovered this issue at UCC/ ODR this year. Went to a local track, took data and saw what the issue is. I think it's due to my bumping in to the lights. I did some staging in my driveway and the issue does not exist. Went to SDX and the issue came right back. I race on DR2's and completed the driveway stage on set of street tires.
Spoke to Larson at SDX, he thinks it's OS related, like what you're stating. I am using OS 55352409.
My truck is put away for the winter. My plan is to track down a few more OS's and then build a few files to see if it is indeed OS related.
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2018 3500 G56 unicorn
2006 2500
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