Duramax boost gauges not working

[brianlibby791]

Good morning all! If any of you know me i am fairly new to the gmt forum, i have an 04.5 lly duramax and the turbo gauge on my tuner, as well as on my kick panel both do not work, im new to the diesel world and im not sure what it could exactly be. Any help is appreciated, thank you!

 

[djthumper]

Welcome aboard! What tuner do you have? What do you mean your kick panel does not work?

 

[brianlibby791]

Edge cs tuner. And on the panel under the steering column there is a boost gauge there as well.

 

[littleblazer]

You still got the tech 2. Plug it in and look at the manifold pressure at idle. You should have some vacuum I think? (Do diesels have vacuum?) If the digital readout on the tuner isn't working I'd look at the sender for pressure. There should be an atmospheric pressure sensor and manifold sensor. If one isn't working I believe it can't bias it based off of ambient pressure. They go bad a lot the boat uses the same ones and it puts it in limp mode when the atmospheric ones go bad...