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Thread: Limp mode, wiring and codes

  1. #1

    Default Limp mode, wiring and codes

    Not to beat a dead horse on this topic but just want to make sure I'm thinking correctly before I decide to start taking things into my own hands.

    First the truck, 2005 3500 4x4 allison with 127,000 miles.

    Visited family about 140 miles away this weekend, truck ran great as always on the way over. Parked the truck overnight, started it up the next morning to go golfing, drove about five miles down the road took off from a stoplight and I got the "CEL", engine really didn't seem to run much different but thought I heard some diesel clattering that was louder than normal.

    Drove it to my friends house and parked it. Came back about 9 hours later, started it up, when I pulled out of his driveway it went into limp mode and I could diffinitely hear a lot more clattering than normal, sounded like a old volkswagen NA diesel, and would not go faster than 15 miles an hour.

    From what I have read this sounds like #2,#7 injector harness, is that correct? I have read some things on the internet about this ice pick fix but can't find any detailed pictures or instructions, anyone know where some is? If I do fix it this way will it automatically come out of limp mode or do I need to unplug batteries to reset it?

    Also, I was hoping to check the codes (but I left the truck 140 miles away), I know some vehicles if you cycle the key a certain amount of times (like 5) the codes will display on the information center, is there any deal like that on the silverados?


    Thanks for all the help!

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Welcome aboard!

    Sounds like time for a fuel filter change, at least to start with. It does not sound like the injector harness issue.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,057

    Default

    No way to read the codes without a code reader. If you're stuck, change the fuel filter, then, if you can, drive it to a parts place (Auto Zone is one) where you can get the codes read free.
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
    New ride: MB GLS450 - most stately
    Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510

  4. #4
    Join Date
    Mar 2000
    Location
    Loyal WI US
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    10,792

    Default

    Two tools everybody should have. These will save you so much grief in the event that situations like this pop up. We can all guess at what the problem may be, but without knowing the DTC's and condition of the fuel filter/system it's just a guess.

    Code reader:

    http://www.thedieselpage.com/reviews/quicklynks.htm






    Fuel filter/system restriction gauge:

    http://www.thedieselpage.com/reviews/jkfuelpressure.htm



    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!

  5. #5

    Default

    Since my truck is a 140 miles away I talked my dad into buying a code reader for me today so he can check the codes and relay them to me tonight, will post as soon as I get them.

    Thanks for the help!

  6. #6

    Default

    So my dad hooked up the reader and this is what he got:

    P0202- Injector circuit/open cylinder 2
    P0700- Transmission control system (mil request)
    P1294- no definition
    P2149- fuel injector group b supply coltage circuit/open

    he also looked under transmission codes and it had a pending code:

    P0742- Torque converter clutch circuit stuck on

    He started it up and it was running fine, drove it a few miles up gave it some good throttle and had no issues.

    So where do I go from here? And anybody have any idea what the story is with the transmission code?

    Thanks again for the help!

  7. #7
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    This would point to the #2 and #7 injector connectors for starters. Try this, clear codes and see what happens.

    My 2005 had similar issues. Had the connectors done under warranty. Still does the P1294 occasionally. Primarily when engine is warming up and early on as described by original post. I haven't located the issue, but figure it must be the harness near the alternator. I'll be rechecking the injector connectors as well.


    P1294 Injector Circuit Low to High Current Transition Time Bank 2
    Last edited by Kennedy; 07-21-2010 at 06:45.
    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!

  8. #8

    Default Fixed

    So, went back to get my truck this weekend. Took injector #2 connector off, gently hammered a small drill bit in each of the four little square holes above and below the actual connector part until I saw that it closed up quite a bit, stuck it back on the injector, cleared the codes and have put about 200 miles on it-no issues.

    Thanks for the help!

    Adam

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