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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 01-14-2016, 12:39 PM   #1 (permalink)
thomas0202
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Loss of power and P2563

I recently replaced the vane position sensor on my LLY back in July due to a P2564 code and no boost. The truck has been working great since I replaced the sensor. Had it relearned with a Tech II after as well. Monday the truck was running great while driving around. Came back that night and the check engine light was on. P2563 and once it showed P0046. Definitely lower on power at high throttle and sometimes stutters under high acceleration along with plumes of white smoke. Sometimes it seems to work normal and then other times it just falls on its face. The turbo used to be audible when it was building boost and now its not at all. My first attempt is gonna be to clean the vane sensor off and maybe even the control solenoid. Any other guesses of what brought this on out of nowhere?

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Old 01-14-2016, 01:42 PM   #2 (permalink)
Gil_
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You're going to find that the two codes are due to one of three things and/or a combination of: The vane position sensor being bad, second, the vane position solenoid sticking and/or being bad, lastly, the turbo vanes are sticking due to the vanes, or the ring sticking due to contamination. If you look around, you will find that Ford's have this issue worse than some Duramax owners do. Moreover, you will find that we have the same turbo as the Fords do, the Garrett Turbo

Garrett ended up updating the turbos along with an update Vane Position Sensor. In fact, GM issued a bulletin on it and some members here had the units replaced under the powertrain warranty.

After looking further into the cause of the condition, Ford recommended that you use a Cetane Additive that allows for a cleaner burning fuel. According to Ford, much of the issues are a result of the Low Sulfur in the Diesel.

In the meantime, there are a few things that you can do. First, you can see if the solenoid is freely moving by removing the solenoid from the turbo and cleaning the unit and spraying the solenoid with WD-40 to free up the movement. Oftentimes, you will see residual oil that doesn't allow the solenoid to move freely. From there, if you cant get the solenoid to move freely, you will have to go and replace the unit.

If you find that these issues still come up, you will end up having to remove the turbo to get unit rebuilt and have the vanes and ring cleaned and rebuilt. Oftentimes, you will find that it's a good time to take advantage of the opportunity to upgrade the turbo to a better unit such as one the Danville Performance makes for the Duramax.

Cost wise, you will be within a few hundred dollars of finding a New OEM turbo.

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Old 01-16-2016, 02:24 PM   #3 (permalink)
Gil_
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This is a youtube video that is from a Ford Master Tech that explains the situation of the turbo condition. While the video is referring to the Ford Diesel, keep in mind that the turbo is same one that is used in the Duramax Diesel.

https://www.youtube.com/watch?v=q5Py62-cWSQ

Last edited by Gil_; 01-16-2016 at 02:26 PM.
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