Dam...........I pulled and copied the info on the two codes so you'll know.
P2262-turbocharger boost pressure not detected - mechanical P061a-etc level 2 torque performance
Didn't you have a throttle code one time? Hopefully that will be it and the newest flash should fix the bucking issue at 1500 RPM's if that's what she was doing. I've started feeling it so I think it has something to do with the mileage and age of the truck as things loosen up and sensor parameters change.