X15 Turbo Actuator failure?

[Josiah Harder]

(02-10-2023 )Bengy88 Wrote:  Ok to start… is this truck demandated?

Second. In my experiences (I’m not saying it can’t) but I’ve never had a vgt actuator cause the exact issue you are describing…. I have had a turbo clogged with soot cause something really similar to this and 90% of the time when a turbo is giving issues the first thing to code is the vgt actuator. I know you said they checked the turbo but who’s to say they actually knew what they were checking. We will all tell you that 90% of dealership mechanics are just parts changers and just throw parts and guess. I know from experience…. I used to be a dealership mechanic. I would also be interested in the health of the circuits to the vgt actuator and the ecm it’s self. Just thinking out loud here. Some of us could tell you a little bit about what’s going on if you had insite hooked to it but without it we can only play guessing games.

Also. I wonder what the condition of the fuel pump is with over 500k miles on it. The problem you are having could be completely un related to the turbo or vgt and more fuel related.

Thanks for your thoughts. The truck is not deleted and youre right the turbo could be going bad since it has almost a million km or 600 miles and Im not sure I trust the thoroughness of the last Cummins shop I was at. I will get Peterbilt to inspect it well. I myself tried to inspect the circuit and couldnt see any possibility of it being bad since the whole circuit is well covered in tubing and secured to the engine with no way of rubbing through. It all looked good to me unless maybe the pins in the plugs are bad.

I guess its pretty hard to figure out from just a description and few video clips yeah. Do you know if its even possible for the actuator to completely close the turbo and choke the engine? Seems odd there would even be a setting to suffocate the engine like that. Maybe its a fuel pump is that something that should be giving a code though for low fuel pressure?