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Old 07-06-2015, 09:17 PM   #1
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Angry Duramax Diesel Message - Engine Reduced Power

Hello
We have a 2008 Chevy Silverado with 6.6L Duramax Diesel. If we are towing and go over 60 MPH, we get a dashboard message which says "Engine Reduced power". The motor powers down and we cant go any further. We have asked different GM service shops and no one seems to be able to help us. We have discovered that once we prime the fuel canister and restart the truck, we have power again. Note, we are not over weight capacity.
Has anyone experienced this or can help us determine what the problem is?
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Old 07-06-2015, 09:39 PM   #2
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Not sure but here is a forum that I belong to.

Chevy and GMC Duramax Diesel Forum
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Old 07-06-2015, 09:39 PM   #3
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Not sure if you know of this site or not but you may find your answer here:

Diesel Place: Chevrolet and GMC Diesel Truck Forums

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Old 07-06-2015, 09:44 PM   #4
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Hey! i had looked on that forum but couldnt find anything specific. I will try again. Thanks!
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Old 07-06-2015, 09:47 PM   #5
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is the check engine light on?
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Old 07-06-2015, 09:53 PM   #6
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Duramax slowdown

Call Ontario have them run a diagnostic test for you
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Old 07-06-2015, 09:54 PM   #7
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Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles
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Old 07-06-2015, 09:55 PM   #8
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Correction call Ontar have them run a diagnostic test for you
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Old 07-06-2015, 10:10 PM   #9
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yes, the check engine light comes on.
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Old 07-06-2015, 10:11 PM   #10
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What's the code?

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Old 07-06-2015, 10:15 PM   #11
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Fiel leak? A dealer cant figure it out??? Sounds like a really dumb or lazy dealer. Find another dealer with a knowledgable diesel tech
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Old 07-06-2015, 10:16 PM   #12
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Thanks toslow for the Tech tip - will take it with us to a diesel mechanic.

Grayfox - did you mean Onstar or Onstar?
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Old 07-06-2015, 10:44 PM   #13
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How long is it since you changed the fuel filter? I was a bad boy and let it go too long once and it would go into limp mode unless I was very lightfooted. The code was something about the measured fuel pressure being too far below that commanded by the ECU. A fresh filter fixed it up. The next most likely is the fuel pressure relief valve (FPRV). You don't want it to be the high pressure fuel pump.
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Old 07-07-2015, 11:17 AM   #14
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Hi just bought the same engine Diesel 2015 one week ago and was told by a GM employe to buy an extra filter if I do a lot of dusty highway, because what you are saying can happen, maybe its a solution???(i'm no mecanic) but wanted to help, good luck.
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Old 07-07-2015, 11:21 AM   #15
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Sounds like you are sucking air into the fuel supply as when you prime it you regain power. I have seen a lot of fuel filter heads, some fuel hoses. You can get the dtc's and PM me but more than likely it sounds like an air issue as you can reprint it. Try to prime it until it is tight and some times you can spot a leaking fuel filter head, water sensor.
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Old 07-07-2015, 11:28 AM   #16
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The duramax engine is designed to protect itself and the transmission. I had a similar issue by not putting the truck in "Tow" mode and going happily down the highway until the transmission went into limp mode. The duramax is also designed to reduce engine power when it gets hot. It won't send a message to the DIC if you're coolant mixture isn't at a 50/50 mix. If there were any codes thrown you might want to see what they are and maybe that'll give you and idea where to start.
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Old 07-07-2015, 11:34 AM   #17
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Throttle position sensor. Needs to be replaced and is a "skeleton in the closet" issue for GM trucks. Google it. Happened to me
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Old 07-07-2015, 11:36 AM   #18
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Sounds like injectors leaking. Is your oil level over full and smells like diesel fuel? Early Durmax had injector leakage issues. Also follow diagnosis charts for dtcs. May have fuel tank sock ( filter) restrictions. You shutting off truck reset the reduced power mode.. take it to qualified mechanic. Or you will spend more money on someone learning
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Old 07-07-2015, 11:44 AM   #19
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Duramax problems

You have a couple of possibilities. A hairline crack in your filter housing, a weak pickup pump, or a weak CP3 pump. I replaced my filter with the FAAS double filter system it helped some but ended up replacing my CP3 [injector pump]. It worked fine under normal conditions but when under a load it would code and go into limp mode. If you shut it off and pump the filter full and wait for I think for 2 minutes it would reset and work ok for a little while but got progressively worse. If your in Pa or near there are a couple of guys here that only work on the Duramax they are very knowledgeable. Let me know and I can hook you up with him.

Good Luck
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Old 07-07-2015, 11:57 AM   #20
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I had a 5500 Kodiac that did the very same thing, I would shut down under load and higher speeds. I got rid of it. Could not fix the problem.


Chevy and GMC Duramax Diesel Forum


This web site will help list about 30 possible fixes. Good luck.
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