Peterbilt 2015 cm2350 list of issues

[tree98]

No the codes won't get "stuck" like that. There's quite a few things it could be. The engine is just telling you that the egr commanded pressure isn't correct.could be a leak in the egr circuit, a blockage in the egr circuit, a problem with the turbo, faulty sensor, etc. It's gonna be hard to troubleshoot in a parking lot.

Also i would say that valve is at the end of it's life with over 500k on it.