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Old 06-24-2013, 04:04 PM
t.anderson t.anderson is offline
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Engine: 2004.5-2005 LLY 403ci (6.6L) 32v Duramax 310hp 590tq
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Default Turbo charger issue

I am new to this forum and looking for some guidance. My 2005 GMC Sierra 2500HD Diesel 4WD short bed starting losing power and blowing black smoke. Had it towed to the dealer. They are saying it is the turbo charger and want over $4000 to repair it. I am not really doubting their diagnosis...just wondering if I am being take for a ride on the repair cost. I have priced out the turbo charger on line and the first $2000 would cover that pretty much, but the labor is the rest of the $2000+...does this sound right or should I shop around?

Thanks for any input.
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Old 06-24-2013, 10:39 PM
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In2Trux In2Trux is offline
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Engine: 2007.5-2010 LMM 403ci (6.6L) 32v Duramax 365hp 660tq
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I would look into getting a second opinion before dropping 4Gs on a complete turbo swap.
The Duramax LLY engines have been known to have occasional problems with their vane position sensor or vane position solenoid

The solenoid moves the vanes and the sensor tells the PCM how far it moved. It compares the commanded position with the sensor position and throws a code if they vary by a certainly amount.

The sensors is on top of the turbo and very easy to remove. The solenoid is on the side and only slightly harder to remove (you have to disconnect the oil feed line.)

It can be the sensor lying to the PCM or the vanes are hanging up and not moving. Sensors are known to go bad and vanes are known to hang up. Some people have suggested some wot runs to force the vanes to full position, but it's best if you can read (scanner) the desired vane position and the actual and compare. If they match, then something is limiting the boost
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