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Thread: EGR on Ca 2003 LB7?

  1. #1
    Join Date
    Oct 2005
    Posts
    27

    Default EGR on Ca 2003 LB7?

    Today, out of the blue, I had SES light and code P0404 thrown twice. It is EGR "Open condition" related, so I did some searching. I've found info about the EGR and related block off plate for 4.5 to LBZ LLY Duramax engines, but nothing on LB7 EGR. I can't even locate it to check the blue wire that has been mentioned in threads. If anyone is familar with the California spec LB7 EGR stuff to point me in the right direction or to a thread somewhere, I'd appeciate it.


    thanks,
    siggy
    2003 Chev 2500HD/LT/CC/LB7-Duramax/Allison/H2wheels/Bilsteins/Green Keys/195K

  2. #2
    Join Date
    Mar 2007
    Location
    Pacific Northwest
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    740

    Default

    Send me your personal e-mail and I will send you the diagnostic chart for the P0404 for you 2003 CA LB7.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  3. #3
    Join Date
    Dec 2001
    Location
    Yorba Linda, California
    Posts
    496

    Default

    Also, keep in mind that the 2002-2004 LB7 EGR that was used in the CA trucks is different than the EGR used in the LLY version. The LB7 EGR is vacuum operated and has a vacuum pump on the passenger side of the engine. The LLY version is not vacuum operated and there is no vacuum pump.
    '02 Chev 2500HD EC/SB 4x4 D/A

  4. #4
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    Mar 2007
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    Pacific Northwest
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    Default

    What did you come with SIGGY?
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  5. #5
    Join Date
    Oct 2005
    Posts
    27

    Default

    Thanks for the diagnostic chart! I had cleared the codes after reading them and they have not come up again, been almost 1K miles and all is good. I'm wondering if it was a fluke one-time event, or a preview of upcoming issues. This truck has been very solid and reliable so far, my fingers are crossed that things will remain so. 137,000+ happy miles, I keep telling myself I don't need to upgrade to a new truck. Over and over...
    2003 Chev 2500HD/LT/CC/LB7-Duramax/Allison/H2wheels/Bilsteins/Green Keys/195K

  6. #6
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

    Smile

    I'm glad you like your truck!!
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  7. #7
    Join Date
    Oct 2001
    Location
    Myrtlehead, TX
    Posts
    414

    Default

    Siggy,

    My EGR was replaced five monthe ago and the code came again last week. A mech in Oregon took it out and a water cooled pipe that conects to it and cleaned the pipe. It was vety cloged. Hope this helps.

    Mike
    2002 GMC, Pretty Dark Blue, 4x4 / 3500, ZF6, 115 gal spare tank and Rockets... (My Other One): Flying Fuel. I got three engines and a 52,000 gallon tank, how many you got?

  8. #8
    Join Date
    Dec 2001
    Posts
    44

    Default Egr

    humm egr block off plate .I have an 05 any info would be greatly appriceated. My e mail is olychuckchuck@hotmail.com

  9. #9

    Default

    I happen to have an 03 LB7 and have had the darn P0404 code for several months now. I've replaced:
    1997254
    and
    94459951

    If anyone has anymore words of wisdom, I'd really appreciate it. Could I see that diagnostic chart?

    is the EGR supposed to move? This weekend I was looking at it and couldn't budge it...


    anyone?

  10. #10
    Join Date
    Jul 2000
    Location
    Gilroy, California, United States
    Posts
    396

    Default

    Have truck in dealer for noise after water pump replacement, belt off sounds goes away we think its the tensioner and are replacing that. Truck also had SES and tech says it has P0404 and P1404 wants to clean or replace the EGR valve. I am wondering if the EGR cooler needs cleaning, truck has 150k miles and usually runs light duty no heavy towing. Also wondering if EGR needs calibration.

    Matt
    mattb5150@hotmail.com

    1993 K2500 HD ext.cab 4x4 - SOLD

    2003 GMC K2500HD SLT EXTRA CAB/SB DMAX/ALLI, Bilsteins, Sulastic Shackles, Pitman & Idler braces, KD Headlight Harness, CAT filtration, Lift pump w/KD harness, Denali Door handles, Yukon exterior mirrors

    2003 Yamaha Grizzly 660 Stoopider FAST

    1996 VW Passat TDI 48mpg - SOLD

  11. #11
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    Feb 2000
    Location
    Montana
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    11,382

    Default

    It may only need cleaning. Tough call as to whether it's worth the effort or just write the EGR out of the programming....

  12. #12
    Join Date
    Mar 2000
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    Loyal WI US
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    Default

    Quote Originally Posted by More Power View Post
    Tough call as to whether it's worth the effort or just write the EGR out of the programming....
    That would be my best suggestion as there are without a doubt more headaches coming.
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

  13. #13
    Join Date
    Jul 2000
    Location
    Gilroy, California, United States
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    396

    Default

    Quote Originally Posted by Kennedy View Post
    That would be my best suggestion as there are without a doubt more headaches coming.

    John, you have mail!!!!!

    Matt
    mattb5150@hotmail.com

    1993 K2500 HD ext.cab 4x4 - SOLD

    2003 GMC K2500HD SLT EXTRA CAB/SB DMAX/ALLI, Bilsteins, Sulastic Shackles, Pitman & Idler braces, KD Headlight Harness, CAT filtration, Lift pump w/KD harness, Denali Door handles, Yukon exterior mirrors

    2003 Yamaha Grizzly 660 Stoopider FAST

    1996 VW Passat TDI 48mpg - SOLD

  14. #14
    Join Date
    Jul 2000
    Location
    Gilroy, California, United States
    Posts
    396

    Default P1404

    Can someone elaborate on what is happening when the 1404 code is thrown? Is the EGR not opening correctly? Also I know the EGR on this truck runs off the vacuum pump. Is there anything else that runs off the vacuum pump? If the pump were failing would it cause this code to be thrown?

    Matt
    mattb5150@hotmail.com

    1993 K2500 HD ext.cab 4x4 - SOLD

    2003 GMC K2500HD SLT EXTRA CAB/SB DMAX/ALLI, Bilsteins, Sulastic Shackles, Pitman & Idler braces, KD Headlight Harness, CAT filtration, Lift pump w/KD harness, Denali Door handles, Yukon exterior mirrors

    2003 Yamaha Grizzly 660 Stoopider FAST

    1996 VW Passat TDI 48mpg - SOLD

  15. #15
    Join Date
    Feb 2000
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    Montana
    Posts
    11,382

  16. #16
    Join Date
    Jul 2000
    Location
    Gilroy, California, United States
    Posts
    396

    Default

    Jim,

    Can you tell me how to check the vacuum? I assume that when the dealer replaced the EGR valve they would have done a re-learn but maybe not.

    Matt
    mattb5150@hotmail.com

    1993 K2500 HD ext.cab 4x4 - SOLD

    2003 GMC K2500HD SLT EXTRA CAB/SB DMAX/ALLI, Bilsteins, Sulastic Shackles, Pitman & Idler braces, KD Headlight Harness, CAT filtration, Lift pump w/KD harness, Denali Door handles, Yukon exterior mirrors

    2003 Yamaha Grizzly 660 Stoopider FAST

    1996 VW Passat TDI 48mpg - SOLD

  17. #17
    Join Date
    Feb 2013
    Location
    USA New York
    Posts
    1

    Default lb7 egr delete, light delete istructions

    Quote Originally Posted by Duramaster View Post
    Send me your personal e-mail and I will send you the diagnostic chart for the P0404 for you 2003 CA LB7.

    Hi
    I have an LB7 duramax calf. emmis
    Do you have a way to delete the engine light after the block plate
    have been installed?
    My light came on after about 60 yo 80 miles after installing plate,
    Canceled it out. What is EFI LIVE they talk about.

    Thank you

  18. #18
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    If you pop over to my web site you'll find my email. Drop me an email.
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

  19. #19
    Join Date
    Nov 2014
    Location
    CA
    Posts
    1

    Default P0404 Code after Vacuum pump change

    I have a 2003 2500HD with the LB7. I just replaced my vacuum pump due to failure. After the pump was replaced, and truck driven a little, the SES light came on. It came up with the P0404 code. I know it has something to do with the EGR but cant figure out how to diagnose the problem. I have read that it might not be the EGR itself.

    The truck seems to run fine, no idle or performance issues. After the code was reset, less than 20 miles later the SES light came back, so did the P0404 code.

    Any thoughts????

  20. #20
    Join Date
    Aug 2020
    Location
    Phoenix AZ
    Posts
    2

    Default

    I’ve been having issues with my LB7 throwing ses codes at me. A buddy pulled the code up and tells me I need to clean my EGR, my question is does my 2003 lb7 have a cooler as well? I can’t find them any where. Any help would be very much appreciated. If there’s a better way please help

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