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Old 07-07-2015, 12:00 PM   #21
West Coast Folks
Join Date: Jan 2014
Location: Delta, BC.
Posts: 2
Engine reduced power fiasco on a DuroMax 08

Hey there.
Same thing happened to me when I had the same truck..
The problem was in the fuel filter. On the bottom of the fuel filter is an elec. sensor for water. This thing s'posedly got stuck and it sends the engine into reduced power mode. It happened with me in Quebec where all our fellow country men speak mostly French only,..that's another story...but they have good GMC mechanics that know their stuff. He changed the entire filter and we were away. They seemed to know exactly what to look for.
Hope this will help you. Yes,...always carry a spare filter, and you get at the thing from inside the right wheel well on the outside.

The West Coast Folks...just back from the Black Hills
Days traveled:
Vancouver to Newfoundland and back, Vancouver to the Black Hills,return, Vancouver to Fairbanks return. (we like the long hauls)
Wildcat 313RL (lifted),
2015 Dodge diesel 3500 (lifted)

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Old 07-07-2015, 12:08 PM   #22
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Join Date: Aug 2011
Location: Iowa
Posts: 34,423
Duramax fuel filter adapter "nicktane"

08 duramax tuned n modded
2011 32bhok Sabre
2015 camping "11 nights"

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Old 07-07-2015, 02:41 PM   #23
Join Date: Apr 2015
Posts: 87
Check for rusty fuel line from tank. My 2005 company truck developed pin holes in fuel line that sucked in to much air under load. Ran fine when not towing. While your under there check your brake lines. Mine rusted through too. Got to love the Midwest snow and salt.
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Old 07-07-2015, 03:25 PM   #24
Join Date: Jul 2014
Posts: 96
I have a 2003 Duramax, it would shut down for no reason. I would prime the filter & it would be ok for awhile, than again, shut down. I discovered the O-Ring on the bleeder screw on top of the fuel filter housing had a hair line crack in it. I replaced the O-Ring & have had no problems since. Aparantly, it was sucking a tiny bit of air & over time would loose its prime. Hope this is helpful, if this is your problem. An easy fix
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Old 07-07-2015, 03:36 PM   #25
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Join Date: Feb 2015
Location: California
Posts: 4
On my 2012 duramax,I started it remotely, it ran for a few minutes and shut down. the check engine light came on and then the message was "reduced speed in 75 miles" check owners manuel.
I took it into the dealership and they found the sensor wire running along the air conditioner lines had chaffed on the frame and was shorting. It was a simple fix. They thought it was the exhaust canister plugged originally.
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Old 07-07-2015, 04:06 PM   #26
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Join Date: Feb 2011
Posts: 17
I had a very similar problem with my 2011. It was DEF system related and it took several tries but after they replaced all the sensors I have not had a problem. It was fixed when I had about 50,000 miles on it. No problem since then and am at 61,000 now.
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Old 07-07-2015, 04:12 PM   #27
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Join Date: Apr 2013
Location: N.W. Illinois
Posts: 311
The dreaded reduced power message.
Use to happened to mine alot.You can clean out your dpf filter or do what I did and remove it.Must get it turned off by a tuner.
Never had a issue again
Plus have you checked your fuel filter. (And don't get those crappy plastic filters nothing but a headach)
2007.5 Chevy 3500Ltz cc lb Duramax
2010 Sandpiper 345 RET (SOLD)
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Old 07-07-2015, 04:50 PM   #28
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Join Date: Nov 2014
Posts: 506
There should be one or more codes stored.

Autozone or O'Reilly stores will read them for free. That way you can get an idea what is going on.
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Old 07-07-2015, 05:57 PM   #29
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Join Date: Sep 2014
Location: Norcal
Posts: 2,008
As Turbs stated CODES. If you tell us the codes chances are your troubles are over.
2015 Salem 27RKSS
2015 Ram 2500 CC 4x4 Cummins
55' Chevy Bel-Air
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Old 07-07-2015, 06:02 PM   #30
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Join Date: May 2012
Location: Summer in Ontario, Winter Texans
Posts: 86
Duramax Diesel - engine reduced power

Had the same problem for almost two years and fixed it with a repair kit for the Fuel Filter Primer. Was able to purchase the kit at Auto Zone.

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diesel, power

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