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My truck is a 2013 gmc duramax, it has for the last week,
my truck is a 2013 gmc duramax, it has for the last week, said it was cleaning the exhaust filter after turning it on initially. today it just started reducing engine power... ideas? … read more
Ryan Kelley
Ryan Kelley
Director of Transportation
Technical School
144 satisfied customers
It's a gmc 2014 the reduced powers mode has activated I have
It's a gmc 2014 the reduced powers mode has activated I have changed 3 if the exhaust temp sensors cleared the codes and it immediately comes back … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
865 satisfied customers
Exhaust Fluid Quality Low; Engine Code P249D, We are on a
Exhaust Fluid Quality Low; Engine Code P249D, We are on a long road trip and it is forcing the truck to go slower and slower. We were at 75, now max speed is 65 … read more
Eric
Eric
Retired
N/A
41,992 satisfied customers
Def light won't reset after adding fluid and speed has been
def light won't reset after adding fluid and speed has been reduced to 65 … read more
Chad Farhat
Chad Farhat
ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Associate Degree
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2018 gmc duramax diesel in limp mode. Have driven over 100
2018 gmc duramax diesel in limp mode. Have driven over 100 miles & wont come out of it? … read more
HDGENE
HDGENE
9,510 satisfied customers
Just put in a block on a 2013 Duramax lml. Getting code
Just put in a long block on a 2013 Duramax lml. Getting code p128e and p0303. Engine runs rough and is in reduced power mode. … read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
21,645 satisfied customers
I have a 2015 Gmc duramax washed the filter cleared the
Hi i have a 2015 Gmc duramax washed the filter cleared the codes less than a minute of driving check engine light comes on and truck goes right down to half power code P2463 comes up first and then af… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
865 satisfied customers
On 24 APR I received a response from you rgdg P0420 & P2463
On 24 APR I received a response from you rgdg P0420 & P2463 codes on my 2011 Sierra 3500 6.6 Duramax. I checked for exausted leaks, found None. I check IN & OUT Temps of Catalytic converter, RPM 2200 … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
865 satisfied customers
2011 GMC 3500HD 6.6 LML DURAMAX (Stock, no mods). Code P0420
2011 GMC 3500HD 6.6 LML DURAMAX (Stock, no mods).Code P0420 - Catalyst System Efficiency below Threshold Bank 1. Code P2463 - Particulate Filter restriction - soot accumulation. Upon starting DIC Msg … read more
Eric
Eric
Retired
N/A
41,992 satisfied customers
I have a 2011 gmc savana with LGH duramax. The follow
I have a 2011 gmc savana with LGH duramax. The follow message appear in cluster : clean DPF, run until message clear. I look in ecm data and it have 60 g. of soot. I try to enable regeneration with sc… read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
35,289 satisfied customers
My 2010 Duramax flashed the Clean Exhaust Filter message but
My 2010 Duramax flashed the Clean Exhaust Filter message but then within seconds it went into Reduced power Mode. I was on my way home from work so I drove about 25 miles at highways speeds and the Re… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
2,070 satisfied customers
GMC 2015 Duramax LML V8 6.6L - DIC message SERVICE EXHAUST
GMC 2015 Duramax LML V8 6.6L - DIC message SERVICE EXHAUST FLUID SYSTEM - SEE OWNERS MANUAL . Filled DEF reservoir. Was not empty. Drove 60 miles still did not reset. Warning that it will reduce MPH t… read more
BOBBYSS
BOBBYSS
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Associate Degree
14,710 satisfied customers
GMC 2015 Duramax LML V8 6.6L - DIC message SERVICE EXHAUST
GMC 2015 Duramax LML V8 6.6L - DIC message SERVICE EXHAUST FLUID SYSTEM - SEE OWNERS MANUAL NOW -TRANSITIONING TO 7 KM/H(4 MPH) MAX SPEED displays. A flashing warning light and a chime also come on. V… read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
1,610 satisfied customers
I spend a lot of time on the road. i am retired. i usedto
I spend a lot of time on the road. i am retired. i usedto design and build 12V and 24V control systems. This winter my DEF started giving me strange readings. the tank was at 14% and it took maybe 1 g… read more
Expert
Expert
7,453 satisfied customers
GMC 2500 Series: 2008 GMC DURAMAX is displaying to clean exhaust
2008 GMC DURAMAX is displaying to clean exhaust filter ok i got home and notice the exhaust pipe under the truck way too hot is it normal to be this hot to the point where smoke is being produced? the… read more
Mike Kelly
Mike Kelly
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Vocational, Technical or Trade Scho
2,509 satisfied customers
GMC 2500 HD duramax: Engine power reduced in 2008 duramax.
Engine power reduced in 2008 duramax. Says clean exhaust and see manual. Can't find the manual. Is there a quick fix or does it need to go in?… read more
Randall C
Randall C
Auto Technician / Consultant
Vocational, Technical or Trade Scho
13,796 satisfied customers
GMC silverado: My 2010 GMC runs bad. Dash says,"Engine power
My 2010 GMC runs bad. Dash says,"Engine power reduced", malfuction light is on, clean exhaust filter.HOW AND WHERE?!!!!… read more
Don - Mo Lurch
Don - Mo Lurch
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Vocational, Technical or Trade Scho
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GMC 2500hd serria: I have a 2500hd duramax and my exhaust filter
I have a 2500hd duramax and my exhaust filter clean and reduced engine power warning light keeps coming on what can i do to fix it… read more
Dave Nova
Dave Nova
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Associate Degree
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

2,070 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

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GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

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865 satisfied customers

24 years of experience diagnosing & repairing

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

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Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

264 satisfied customers

GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

Mike S.

Mike S.

ASE Certified Technician

248 satisfied customers

GMC N.A.I.S.E. Certified Auto-Mechanic

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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