P0489 question

[dsltnr]

This is a 2008 6.7 that has had a dpf delete and the guy has done his own tuning and ask me to help him with an issue he is having and I cannot see what is causing it so I told him I would post it here and see if you guys could help.

EGR still intact and EGR tuning still as stock but getting a random P0489 code. I think his valve is sticky occasionally and setting the code. Does this sound likely or probable? That is the only code he is getting.

[Boost]

Valve sticking is likely IMO.

[dsltnr]

Thank you

[Boost]

You're welcome, get a second opinion though.

[dsltnr]

Does anyone have a solution to this on how to resolve it? Is it a situation of a part needing to be replaced or is there something that can be cleaned or something to prevent sticking? Thanks

[4NEATR]

It's probably carboned up, take the EGR apart and clean it with brake clean or something similar. When I took mine off, I even had trouble getting the temp probe out of the horn because it was so carboned up it wouldn't back out of the 1/8" hole, and that was with only 10k miles on the truck