Humming/Buzzing noise after 2500 mile trip

[jeostang]

After driving and cutting the truck off I'm getting a humming noise coming from the engine bay that I've never heard before. Almost sounds like a compressor bleeding off air. It last for about 15 seconds. This is a different sound from the one that I normally hear from the trans area after cutting the truck off. This started after getting home from a 2500 mile trip. Anyone else ever have this problem?

[bbc109758]

Yes. Found on other forums that it is a bad waste gate control valve p/n 9E882. After shut down the egr switches and then pumping sound for 30-60 seconds. They say if you hit the brake it then stops by that also. Now if I can figure out why my regens best ever distance between them 200 miles even freeway trips but mostly 75-150 regen. Never seen a tank of 20mpg since new unless I reset when at freeway speeds and then only till regen and I have torq 2.1. Oh well till I can find that problem hope that helps you.