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Filled lmy 2012 Duramax with DEF. It was 13 miles until
Filled lmy 2012 Duramax with DEF. It was 13 miles until reduced speed of 65 MPH. Started up and drove around the block. It did not reset. How do I reset? … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,912 satisfied customers
I have a 2011 diesel 2500hd GMC Sierra and was driving it
Hi I have a 2011 diesel 2500hd GMC Sierra and was driving it and the def warning cam on and told me poor quality and then the check engine light has come on to and also my def tank is filled and now m… read more
Chris Carr
Chris Carr
Ase Master
Ase Master Tech
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I have a 2011 GM Sierra 3500hd with the duramax lml engine.
I have a 2011 GM Sierra 3500hd with the duramax lml engine. I have a service exhaust message and another that says on next fill up I will be limited to 4 MPH. I think the problem is the reductant heat… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,912 satisfied customers
2017 GMC Denali duramax doesn't show how much deff left but
2017 GMC Denali duramax doesn't show how much deff left but still tells you it's ok but not the level of fluid … read more
BRIAN
BRIAN
Program Coordinator/Professor Automotive
BS
342 satisfied customers
Just filled up the DEF but it's not resetting. 2015 3500 LTZ
just happened today. Got in the truck this morning and it said 60 miles under low speed, refill DEF. Normally it gives a good heads up, and I know it isn't empty. I put a jug of DEF in anyways, about 1.5 gallons, and it didn't make a difference. So I assume the level indicator is stuck? Not sending a signal? … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
33,220 satisfied customers
I have a 2015 GMC 3500 Duramax. I was on a ski trip a few
Hi I have a 2015 GMC 3500 Duramax. I was on a ski trip a few weeks ago and the truck has been acting up since. It first threw a P21DD code which was probably do to the DEF tank freezing. I drop the ta… read more
Andrew
Andrew
Master Diagnostic Technician
Associate of Occupational in Automotive Technology
330 satisfied customers
DEF light stays on, speed limited, I filled twice and I
DEF light stays on, speed limited, I filled twice and I don't see a leak … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
33,220 satisfied customers
2012 gmc denali 2500 duramax. the "service exhaust fluid
2012 gmc denali 2500 duramax. the "service exhaust fluid system" indicator came on. went to max xpeed 65, then to max speed 55, now in 65 miles it will go to 4mph. Had a bad battery and changed it. Ha… read more
Tim Mohr
Tim Mohr
SHOP OWNER
Master's Degree
17,386 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
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Thinking of buying a 2016 GMC Denali 2500HD with 170k
Thinking of buying a 2016 GMC Denali 2500HD with 170k miles... what should I be concerned about regarding durability?… read more
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GMWrencher
Associate Degree
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Service Emissions System 2012 GMC Sierra HD Service Emission
Service Emissions System 2012 GMC Sierra HD Service Emission Systems on DIC P21AB Code on Torque app through Bluetooth OBDII Reader. … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,912 satisfied customers
Service Def system warning speed reduced to 55 we are
Service Def system warning speed reduced to 55 we are traveling anyway to bypass it? … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,912 satisfied customers
2012 GMC Denali HD Duramax Diesel. Engine idle has an
2012 GMC Denali HD Duramax Diesel. Engine idle has an occasionally mild surge when fully warmed up, in drive or reverse. How do I cure this?… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,912 satisfied customers
Dec. Def says empty it's full is there a reset. 2015
Dec JA: What is the model/year of your GMC? Customer: Def says empty it's full is there a reset JA: What year is your GMC? Customer: 2015 Silverado 2500 duramax JA: Are you fixing your Silverado yours… read more
JFN1
JFN1
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Vocational, Technical or Trade Scho
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Getting a service message on my exhaust fluid system and is
getting a service message on my exhaust fluid system and is transitioning to 65mph … read more
Gabriel Grey
Gabriel Grey
Master Service Technician
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2011 duramax engine code P205B, code P205B have reset it 1
will try to fix it myself since GM wont take care of it … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
33,220 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
Automotive Repair/Damage Investigator
Associate Degree
14,675 satisfied customers
2012 GMC Denali HD Duramax 6.6L diesel. Low DEF quality lamp
2012 GMC Denali HD Duramax 6.6L diesel. Low DEF quality lamp just came on. Last February we removed the tank and drained it out trying to correct other emission system issues. Have only put 2000 miles… read more
Jared D
Jared D
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Gm Tech (Cam)

Gm Tech (Cam)

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Don - Mo Lurch

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Mike S.

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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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