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On a 2012 gmc truck with a 6.6 Diesel engine and 2500 it
On a 2012 gmc truck with a 6.6 Diesel engine and 2500 it says service exhaust fluid system and 71 miles till 55 mph top speedSo I scanned it and P20B9 code and I cleared it but still nothing and it's … read more
Dustin Bourne
Dustin Bourne
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12 satisfied customers
Def refilled but limiting 55 mph heading to a 4mph limit
def refilled but limiting 55 mph heading to a 4mph limit code-p20ee and p2bad show on scanner … read more
Gm Tech (Cam)
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
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2011 2500 chevy - Filled DEF this morning. Drove it for over
2011 2500 chevy - Filled DEF this morning. Drove it for over an hour at 65mph on freeway light never went off. Stopped for about 1/2 hour and when got back in and started it up it now limits to 55mph.… read more
Eric
Eric
Retired
N/A
42,100 satisfied customers
My message said "Exhaust Fluid Poor". After putting 1 gallon
My message said "Exhaust Fluid Poor". After putting 1 gallon of DEF in my truck, the maximum speed is still 4 mph. Also, the check engine light came on. What can I do? … read more
Gm Tech (Cam)
Gm Tech (Cam)
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2011 duramax 6.6 lml - first the por quality message,
2011 duramax 6.6 lml - first the por quality message, cleaned out the reductant tank and yes, found the filler tube was broken and there was … read more
Reggie Whiddon
Reggie Whiddon
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Vocational, Technical or Trade School
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I have a 2015 3500HD Silverado and the wife filled the DEF
I have a 2015 3500HD Silverado and the wife filled the DEF when the 99 mile warning came on it still limited her speed to 55mph later that day. How do I reset the computer? … read more
Gm Tech (Cam)
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
2,070 satisfied customers
2011 GMC Denali Sierra 2500. DIC informed of need to service
2011 GMC Denali Sierra 2500. DIC informed of need to service engine, indicating need for a fuel filter. On the way to service, went into limp mode at 4mph. Was serviced with oil change, fuel filter an… read more
Eric
Eric
Retired
N/A
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My service exhaust system message with the mileage countdown
My service exhaust system message with the mileage countdown wont reset … read more
Gm Tech (Cam)
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
2,070 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
463 satisfied customers
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
2,070 satisfied customers
Exhaust fluid system will not reset. About 66000. 2016 Chevy
now I have a service prompt It's telling me 77 miles to 65 mph and to see owners manual… read more
Gabriel Grey
Gabriel Grey
ASE Certified Master Technician
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I have a 2016 gmc diesel I got a warning light-to Service
I have a 2016 gmc diesel I got a warning light-to Service Exhaust fluid system.With no check engine light I brought it to my local shop they changed the two heaters one line heater and one tank heater… read more
Expert
Expert
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I have a 2011 GMC sierra with the LML 6.6 L Duramax. The
I have a 2011 GMC sierra with the LML 6.6 L Duramax. The problem I have is code P22A1. When I look at the scan data differential pressure sensor is reading 475 PSI negative. It also says the dash or D… read more
Chris (aka-Moose)
Chris (aka-Moose)
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Vocational, Technical or Trade School
66,369 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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2015 Duramax DEF light won't reset after adding fluid and
2015 Duramax DEF light won't reset after adding fluid and speed has been reduced to 55 mph. … read more
Chris Carr
Chris Carr
Ase Master
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2012 Silverado 3500 HD, Duramax, w/ 52,000 mi. (Just
2012 Silverado 3500 HD, Duramax, w/ 52,000 mi. (Just purchased) Check Engine Lamp on, Plus message "Exhaust Fluid Poor Quality" . Truck is in 65 mph limit, soon to drop to 55 mph. Added 2.5 gal. fresh… read more
Chris Carr
Chris Carr
Ase Master
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Filled def tank and still won't go over 55 How do you reset
Filled def tank and still won't go over 55 How do you reset it? … read more
Pete
Pete
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General auto certifications
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GM Kodiak c: I ran out of fuel in a 6.6 Duramax with an Allison
I ran out of fuel in a 6.6 Duramax with an Allison A/T. Filled both tanks with fuel, primed the filter and engine cranked and runs fine. It revs to about 3500 RPM. When I drive, first gear is normal, … read more
Gm Tech (Cam)
Gm Tech (Cam)
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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

1,589 satisfied customers

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)

GMC Technician

66,369 satisfied customers

24 years of experience diagnosing & repairing

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

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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