Intermittent flashing SES light

[Big Bopper]

Mat Benjamin, any bulletin number from your work order to post. I found the PI but not the bulletin. 
 

It looks like the dealers are changing lifters and wasting peoples time instead of updating software. 

Edited July 9, 2021 by Big Bopper
Typo

[Mat Benjamin]

21-NA-154

[Big Bopper]

Thank you Mat

[Big Bopper]

False misfire flashing MIL 
 

An update here for anyone still having trouble with this. There is an additional calibration released approx 09/24/21 to address L84 10 speed vehicles with this problem after the listed bulletin has been performed. My truck did it after the bulletin. Not sure if the existing bulletin will be updated with a new version, probably. 
 

A note on this:  I only had the false misfire at about 105F or so with a half a tank or less fuel fill. It may not occur on most of these trucks except under certain conditions. 
 

It looks like some dealerships are confusing this issue with the pushrod lifter issue. So unless you have noise or an actual misfire condition, try this first. This is not a noticeable misfire, just an over sensitive calibration for the firing mode that is occurring.