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Related GMC Questions
Def was getting low. It said 45miles to restrict MPH to 65.
def was getting low. It said 45miles to restrict MPH to 65. Filled with fluid did not reset. It has now set transmission to 55 MPH. It is a 2012 GMC HD … read more
Roy
Roy
shop foreman
Associate Degree
5,476 satisfied customers
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)
GMC Mechanic
Vocational, Technical or Trade Scho
1,976 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
34,454 satisfied customers
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
Roy
Roy
shop foreman
Associate Degree
5,476 satisfied customers
On the road and a way from home. DEF light on. Fluid
On the road and a long way from home. DEF light on. Fluid completely full. Down to 55 mph. How do I reset … read more
EricFromCT
EricFromCT
Auto Technician
5,449 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
17,772 satisfied customers
I have a 2011 Chevrolet 3500 with 6.6 duramax. I have
I have replace the def heater. Truck is in limp mode all test come back passed. But is stilll in limp mode and now says at next fuel fill will go to 4 mph . How do I reset this … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
813 satisfied customers
My 2016 GMC is threatening to reduce my speed to 65 mph
My 2016 GMC is threatening to reduce my speed to 65 mph within 21 miles if I can't clear the fuel exhaust warning light. I put 5 gallons of Peak DEF in the reservoir and it still won't reset. What sho… read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
34,454 satisfied customers
2015 duramax that has full Def tank and dash warning wont go
2015 duramax that has full Def tank and dash warning wont go away, any thoughts … read more
Robert Blackwell
Robert Blackwell
Shop Owner
Vocational, Technical or Trade School
159 satisfied customers
Need to know how to reset diesel exhaust fluid system, Yes
Need to know how to reset diesel exhaust fluid system … read more
dustin barnhardt
dustin barnhardt
6 satisfied customers
DEF sensor wont rest even though reservoir is full, no
DEF sensor wont rest even though reservoir is full … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
813 satisfied customers
Def fluid is full and dash is telling me 43 miles until 55
Def fluid is full and dash is telling me 43 miles until 55 mph limits … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
34,454 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
The DES system won't reset after adding fluids. Diesel
I tried to unhook the battery to see if I could get a reset. … read more
Roy
Roy
shop foreman
Associate Degree
5,476 satisfied customers
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
Automotive Diagnostic Specialist
General auto certifications
34,454 satisfied customers
Ex fluid said 75 miles till speed reduction to 65 mph. Put a
Ex fluid said 75 miles till speed reduction to 65 mph. Put a jug in no reset, bought another jug put 1/2 in filled. Still on , now says 7 miles to speed reduction. Closest gmc 50 miles away . … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
813 satisfied customers
I filled the DEF tank and the low DEF message won't clear.
I filled the DEF tank and the low DEF message won't clear. Now it's saying Action Required, fill DEF tank or speed will be limited to 65. I'm traveling and it's the weekend. Truck is 2016 Duramax. … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
34,454 satisfied customers
Why would the paint on my 2006 GMC YUKON XL being wearing
Why would the paint on my 2006 GMC YUKON XL being wearing down (NOTR FLAKING) in sections, some as long as 3 feet and as wide as 4" down the roof line. It looks like someone took a sandblaster and ble… read more
Mike S.
Mike S.
ASE Certified Technician
Vocational, Technical or Trade Scho
243 satisfied customers
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,976 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

813 satisfied customers

16 years of experience

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

257 satisfied customers

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

Mike S.

Mike S.

ASE Certified Technician

243 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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