GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

Related GMC Questions
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
138 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
1,823 satisfied customers
My husband's def system is saying that it is low. But the
My husband's def system is saying that it is low. But the resivior is full … read more
Roy
Roy
shop foreman
Associate Degree
4,481 satisfied customers
2011 gmc diesel duramax speed limited to 7hm hr what do I
2011 gmc diesel duramax speed limited to 7hm hr what do I do … read more
Danny
Danny
Owner, lead mechanic
High School or GED
4,713 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
33,589 satisfied customers
I have a 2015 GMC Denaili 2500hd the exhaust fluid is
Second opinion] I have a 2015 GMC Denaili 2500hd the exhaust fluid is showing 42 miles before dropping to 4 mph what can I do… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,823 satisfied customers
2013 gmc duramax diesel: service exhaust fluid system
2013 gmc duramax diesel: service exhaust fluid system warning light and states will reduce speed. Filled DEF tank, warning persists … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
675 satisfied customers
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
Associates
457 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
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
14,567 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
29,918 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
Roy
Roy
shop foreman
Associate Degree
4,481 satisfied customers
We purchased a used 2011 chevy diesel shuttle bus. we have
we purchased a used 2011 chevy diesel shuttle bus. we have run it without incident for almost a year. Now we have had it in the shop no less than 5 times for the same issue. The shuttle bus system is telling us the DEF fluid is poor quality. We buy PEAK brand which was recommended. The dealership cannot seem to correct this error and now the shuttle is telling us "max 55 mph upon restart" and as far as i have read that is the beginning of the end. We really need help here as our local dealership seems to be ill equipped to correct the problem. … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
29,918 satisfied customers
Are you live : maybe you can help : my wife had low fuel
my wife had low fuel light on our new 1025 GMC denali 2500, she added diesel and started to loose power, then pulled off the road, now it wont start … read more
Master Auto Tech.
Master Auto Tech.
High School or GED
545 satisfied customers
2012 GMC Denali HD 6.6L diesel. Engine light came on. Got
2012 GMC Denali HD 6.6L diesel. Engine light came on. Got code P2BAD, NOX Exceedence-Root cause unknown. What is that all about?… read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
29,918 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
Auto Mechanic
Vocational, Technical or Trade Scho
2,460 satisfied customers
GMC Sierra: Looking for someone who has experience with GM
Looking for someone who has experience with GM Duramax Diesel engines. I have a 2008 GMC Diesel truck with 150,000 miles on it. Mostly highway miles and all maintenance has been done per the book. The… read more
tripletauto
tripletauto
Shop Foreman
Associate Degree
238 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
Owner
Vocational, Technical or Trade Scho
10,644 satisfied customers
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.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,823 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

675 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

285 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

230 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

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.

Show MoreShow Less

Ask Your Question

x