I ended up replacing the fuel pump control module (13540028 is the new part and replaced 13526238). My 2019 High Country with the 6.2DI truck started idling rough and the check engine light came on. It has 113k miles. It set codes P0498 and P0499 as well as P0449. I replaced the evap control solenoid assembly and the purge valve but that didn’t fix everything. It got rid of the codes except P0498.
The replacement of the fuel pump control module resolved my issue and the truck is running better and no codes.
I got two modules, one from a dealer and one across eBay from China. The China unit is original and has a sharpie mark over the Made in Mexico wording. I’ll hang onto the other as a spare!
