Some 2018-2019 Ford F-Super Duty trucks equipped with a 6.7L diesel engine may exhibit a MIL on with DTCs P2459 (DPF regeneration frequency) , P245A (exhaust gas recirculation cooler bypass control) and/or P259F (turbo A boost control position at high limit) stored in the PCM.
This may be due to the PCM software. Reprogram the PCM using the latest software level.