Took my 2020 in for the tire shakes and the service advisor said there is some sort of def level recall. figured I would mention it.

The Bulletin N192266750 for a software flash I have documented in another thread. It is not a recall and it did not fix my truck when flashed last week. My DEF levels still show half to almost empty when I filled the tank. It seemed to work for a few days showing full then reverted back. Not good -- with mine because of the unknown fix and cause sent the Lemon Law notification letter to GM per the required instructions and per my State Texas requirement Texas Lemon Law Codified as Occupations Code Chapter 2301.

I worded that incorrectly. It's a TSB. My 2020 has not had an issue with DEF usage and or level issue.

My dealer did this on Thursday. Along with the seat belt fix and ordered a front winter grill cover. Mine I had just filled the Def, it showed one bar low before the flash. Showed completely full after.

Keep your eye on it. Mine did the same thing then went haywire again. New fix is to install new DEF Tank Assy. Part is backordered. Been waiting a month so far.