GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

405 trouble code on a 2003 gmc duramx, 405, and yes I've…

Customer Question
405 trouble code on...

405 trouble code on a 2003 gmc duramx

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

405, and yes I've reset it

Mechanic's Assistant: What is the model of your '03 GMC?

Gmc 2003 sierra 2500 hd

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

It says it's low voltage, so I've looked at wiring harnesses

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I have recently changed the fuel filter housing, and that's when the code started

Submitted: 10 months ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 4 hours by:
8/19/2017
GMC Mechanic: Dan, Technician replied 10 months ago
Dan
Dan, Technician
Category: GMC
Satisfied Customers: 25,965
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Databases
Verified

Hello, my name is ***** ***** I'm here to help get your problem solved.

Ask Your Own GMC Question
Customer reply replied 10 months ago
Where is the low voltage sensor located?
GMC Mechanic: Dan, Technician replied 10 months ago

This usually means the EGR valve vacuum control solenoid has failed or vacuum line going to solenoid is leaking. Verify ignition feed to the three EGR solenoids, Pink wire. Test vacuum from the vacuum pump to the EGR valve vacuum control solenoid. Should have 19-20" vacuum with engine running. Check the EGR Valve Vacuum Control Solenoid for a ground pulse on the White wire from the ECM while the engine is running and EGR is commanded. The EGR valve vacuum control solenoid is normally closed. Check the EGR Vacuum Vent Solenoid control wire, White wire. This wire should be grounded by the ECM to block a vent path when the EGR is commanded ON. Here is also information from manual for code, let me know if you have questions. Thanks.

-

https://www.dropbox.com/s/rrtb81t51zb32t2/p0405.pdf?dl=0

Ask Your Own GMC Question
GMC Mechanic: Dan, Technician replied 9 months ago

Ever get it figured out? Please do not forget to rate answer, I am not compensated for time/information until you leave rating. Thanks.

Ask Your Own GMC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gmc mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Dan Your Own Question
Dan
Dan
Dan, Technician
Category: GMC
Satisfied Customers: 25,965
25,965 Satisfied Customers
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Databases

Dan is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

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

1,796 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,588 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

626 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

279 satisfied customers

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

JFN1

JFN1

ASE Certified Technician

270 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

228 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

Related GMC Questions
6/2004 GMC Sierra 2500 w/6.6 diesel. Has over 250,000 miles
6/2004 GMC Sierra 2500 w/6.6 diesel. Has over 250,000 miles on it. Customer had us replace all injectors and high pressure pump, now it will turn over, but won't start. Has fuel going to high pressure… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2000 GMC SIERRA 2500 6.0l stumbles on acceleration 300000+
2000 GMC SIERRA 2500 6.0l stumbles on acceleration 300000+ MILES recently installed a new transmission no check engine light… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2009 GMC Sierra 2500 diesel. Antitheft light came on while
2009 GMC Sierra 2500 diesel. Antitheft light came on while driving home last night, this morning the engine will not turn over. No click from the solenoid,no cranking at all. everything else seems to … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
726 satisfied customers
99 GMC Sierra 2500 classic 5.7 vortec no power to instrument
99 GMC Sierra 2500 classic 5.7 vortec no power to instrument cluster or starter won't do anything when I turn the key all fusible links that I can see are good battery and cables good power to fuse bo… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a 2007 gmc sierra 2500 hd automatic gas plain work
I have a 2007 gmc sierra 2500 hd automatic gas plain jane work truck that is experiencing no start, no crank. My daughter drove it to school Tuesday morning, comes back at 330 to come home and nothing… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
2005 gmc Sierra 2500 v8 6.0. Put in a new starter jumped
2005 gmc Sierra 2500 v8 6.0. Put in a new starter jumped battery, all good. Next day go to start up all is dead. Go get new battery thinking that might be problem still nothing. Fusable link is good. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a 2018 GMC Sierra 2500 HD Denali with the gas engine
Hi Pearl.... I have a 2018 GMC Sierra 2500 HD Denali with the gas engine with only 1200 mile on it and have a coolant leak. … read more
JFN1
JFN1
ASE Certified Technician
Vocational, Technical or Trade Scho
270 satisfied customers
Working on a 2003 GMC Sierra 2500 HD with a 6.0 L gas
Working on a 2003 GMC Sierra 2500 HD with a 6.0 L gas engine. We are pulling code P0120 and P2135. We reset these codes and they come back immediately. The vehicle was towed in. Please advise. Thank y… read more
Ron Z.
Ron Z.
- GMC Tech -
Vocational, Technical or Trade Scho
279 satisfied customers
I just changed my fuel filter on my 03 duramax because my
I just changed my fuel filter on my 03 duramax because my fuel gauge was faulty and now it filled up to half way and its getting to the full spot very slowly! What could this be?… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
Driving and all of a sudden it says change fuel filter. Then
Driving and all of a sudden it says change fuel filter … read more
molurch
molurch
Owner
Vocational, Technical or Trade Scho
941 satisfied customers
2008 GMC Sierra 2500 HD. Over heats occasionally and
2008 GMC Sierra 2500 HD. Over heats occasionally and intermittently.first time it happened I was pulling a camper the heat guage went to 125c . I slowed down the truck shifted down and the guage dropp… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
I changed the fuel filter on my 2003 GMC duramax it starts
I changed the fuel filter on my 2003 GMC duramax it starts then dies I pump it up then it starts and run fin … read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
2011 GMC Sierra 2500 HD transmission intermittently sticks
2011 GMC Sierra 2500 HD transmission intermittently sticks in third gear. Line that tells what gear your in disappears. Shifts hard in reverse an drive when this happens.… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
2007 GMC Sierra 2500 HD classic 6.6L duramax diesel. At
2007 GMC Sierra 2500 HD classic 6.6L duramax diesel. At 58,500 miles threw code P0403 my mechanic did PCM software update per TSB 06-06-04-066D. Was ok for a while then threw same code at 60,500 miles… read more
Dan
Dan
Technician
25,965 satisfied customers
I have a 2005 GMC Sierra 2500 HD Crew Cab 6.0 L 65,000 miles
I have a 2005 GMC Sierra 2500 HD Crew Cab 6.0 L 65,000 miles The problem is the rear windows will not power down i have 13.5 volts across the red and black wires on both rear switches and i have power… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
06 GMC Sierra 2500 HD Duramax. Rear ABS coming on just as
06 GMC Sierra 2500 HD Duramax. Rear ABS coming on just as vehicle is rolling to a stop. Harsh 2-1 downshift occurs at same time. No lights on dash. ????… read more
Anthony Uzmack
Anthony Uzmack
ASE Certified Service Technician
Automotive Technology
45 satisfied customers
04 Sierra 2500 6.0 4X4 It falls into reduced power, Cleaned
04 Sierra 2500 6.0 4X4 It falls into reduced power, Cleaned throttle body, No help. Scanned and found code P1516 and P1516A. What do we need to do?… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 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
626 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.

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