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2011 lml duramax. The fuel pressure relief valve will not
Second Opinion] 2011 lml duramax. The fuel pressure relief valve will not close all the way, so it will not build enough rail pressure to start. … read more
CraigC317
CraigC317
Chevy/GMC Automotive Technician
Automotive diploma
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I have an 04 duramax that won't start. I bought it wrecked a
I have an 04 duramax that won't start. I bought it wrecked a while ago and decided to swap an Lly motor into it instead of the original lb7. I never actually had the truck running before i did the swa… read more
John\u0027s Auto Tech
John\u0027s Auto Tech
Mechanic
Mechanical Trade
263 satisfied customers
A shop changed the fuel filter on a good running lly 6.6 and
a shop changed the fuel filter on a good running lly 6.6 and now the truck dont runwont start … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
2,126 satisfied customers
Crank no start. Fully charge was driving down freeway at 70
fully charge was driving down freeway at 70 all normal and it died … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
2,126 satisfied customers
2011 lml duramax, crank no start. no codes. after cranking
2011 lml duramax, crank no start. no codes. after cranking for a few seconds fuel rail pressure on the scanner shows 6,000-8,000 psi. … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
904 satisfied customers
Motor blew so I but in a used motor it cranks but it won't
Motor blew so I but in a used motor it cranks but it won't start up and white smoke comes out of the exhaust while starting … read more
Gabriel Grey
Gabriel Grey
ASE Certified Technician
1,225 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
23,352 satisfied customers
3500 2001. Its a tad complicated...you or him? 2001 gmc
its a tad complicated...you or him? 2001 gmc sierra 3500 dually RWD ... power loss...Guys - '01 3500 Sierra Dually RWD 6.6L Duramax, w/ Allison. Cruising flat highways and on ramp speed up are no issues. However, up hill (whether towing or not) and kicking down the tranny to lower gear the following happens: dash lights, radio, seemingly the ignition circuit and a loss of power occurs after about 10-20 seconds after starting the hill. Only solution is to remove foot off accelerator and everything comes back on and carries on. To take the hill I must stay around 50 MPH, to avoid tranny shifting? This is a ground issue, isnt it? Is it possible that the tranny and the dash (and/or ignition circuit) are all grounded to the same hard point, that is faulty, perhaps?!? any idea what may be causing this kind of power loss? and gas pedal or tranny/ dash shutdown combination?… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
10,511 satisfied customers
2012 gmc sierra (denali) 2500 hd 6.6 duramax lml died going
2012 gmc sierra (denali) 2500 hd 6.6 duramax lml died going doen highway and won't start turns over fine codes are p0641 p0532 p0193 and p0340 replaced frp codes cleared and return as soon as you spin… read more
Marvin the Mechanic
Marvin the Mechanic
87 satisfied customers
I have a 2008 gmc 3500hd duramax. The truck has a cam sensor
I have a 2008 gmc 3500hd duramax. The truck has a cam sensor code that has been haunting me. It is p0341. Crank but no start. This is what I've tried. Made sure I had a 5 volt reference Put 3 new cam … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
904 satisfied customers
Wont start!! it cranks, 2002 gmc sierra 2500 hd new injector
I put a fass 150 lift pump. rebuilt the filter head. new fuel filter new injectors and new cp3 Cranks at 180 rpm and I only get 1.2kpsi rail pressure … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
904 satisfied customers
Oil Pressure gauge does not register pressure consistently.
Oil Pressure gauge does not register pressure consistently. GMC C/K 3500 dually with 6.6 duramax, 140,000 mi. w/ mfg date of 09/03. Was told it has a new sending unit. Local mech said it was a loose c… read more
C. Walker, Jr.
C. Walker, Jr.
667 satisfied customers
2006 duramax water in fuel tank. injectors are bad cp3 fuel
2006 duramax water in fuel tank. injectors are bad cp3 fuel pump not pumping. should all fuel lines be replaced?… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,089 satisfied customers
Need to know if the ecm in this duramax diesel 6.6 2006 is
need to know if the ecm in this duramax diesel 6.6 2006 is correct .It had a bosch 12606127 the new one is(###) ###-#### … read more
Eric
Eric
Retired
N/A
46,819 satisfied customers
Gmc 5500: I have a 2007 duramax 6.6 it keeps powering down
I have a 2007 duramax 6.6 it keeps powering down it shows a code for low return pressure on the fuel system changed the filter still does this also gets terrible fuel mileage had it into dealership 3 … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
2,126 satisfied customers
GMC Sierra 2500 HD SLT: so i have a 2005 gmc sierra hd lly
so i have a 2005 gmc sierra hd lly duramax tuned with efi live, stage 2 intake,straight piped,egr deleted,fuel rail is blocked, i was having hard stArt issues(when warm) so the all 8 injectors failed … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
2,126 satisfied customers
New injectors installed all 8 glow plugs replaced( they were
New injectors installed all 8 glow plugs replaced( they were all burnt out) truck is still hard to start cp3 pump has no problem getting to 160 map at idle never seen any duramax burn 8 glow plugs run… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
2,126 satisfied customers
GMC C5500: I have a 2006 c5500 flatbed 6.6 duramax allison
I have a 2006 c5500 flatbed 6.6 duramax allison auto that has an innaccurate fuel gauge.It operates till it gets to half tank than stays there.On more than one occassion i have run out of fuel.This is… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
2,126 satisfied customers
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

2,126 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)

GMC Technician

904 satisfied customers

24 years of experience diagnosing & repairing

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

Mike S.

Mike S.

ASE Certified Technician

256 satisfied customers

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

George H.

George H.

ASE MasterTechnician

233 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

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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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