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Thread: L5P: Balance rate criteria changed?

  1. #1
    Join Date
    Jan 2006
    South Milwaukee, WI

    Default L5P: Balance rate criteria changed?

    2017 L5P, 150K miles
    Current DTCs: P026D, P2A00

    These are pending codes and have been for quite some time now. I can get anywhere from 10 to 100 "warm-ups without an emissions malfunction" PID count before it gets reset to "0". No recent CEL activation. I've gone through the diagnostics shown in my Mitchell1DIY (which lists the injectors or the NOx1 sensor), as well as checking the fuel rail pressure sensor connector, the fuel filter (and a line flush), all of the various tech bulletins, etc. One individual on another site mentioned that the injector balance rates changed with the introduction of the L5P. According to this guy, GM stated that the old +/- 4 (P/N) and +/-6 (D/R) do not apply to the new injectors used in the L5P.

    I'm now hearing that 0 +/- 0.2 is the new criteria and exceeding that contributes to the P026D (but no mention of this being in gear or Park). Yes, I find cyl 4 & 5 occasionally displays 0 +/- 0.4 (or more) and 0.7 on cylinder 2; however, if left to idle for a few minutes after a drive, most of them will settle on 0 +/- 0.2.

    Any truth to this new (tight) pass/fail range for the L5P balance rates?

    So. Milwaukee, WI
    '01 2500HD, LB7, ~440K miles
    "Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

    '17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!!) Currently bone stock, 120K miles.

    "Socialism is a philosophy of failure, the creed of ignorance and
    the gospel of envy. Its inherent virtue is the equal sharing of misery."
    Winston Churchill

  2. #2
    Join Date
    Feb 2000

  3. #3
    Join Date
    Apr 2004
    Bar Nunn, WY


    GM stopped using the Bosch fuel system after the 2016 model year (due to CP4 failures) and switched to a Denso system. That's likely the reason for the change.
    2023 Tahoe 3.0l diesel
    2013 Harley Switchback
    2021 Ram 2500 6.7l (sold)
    2018 Chevy Traverse (sold)
    2021 Silverado 3.0l LM2 (sold)
    2019 GMC Sierra 6.2l (sold)
    2019 Colorado ZR2(sold)
    2017 2500HD CC D/A (sold)
    2015 1500 CC High Country 6.2l (sold)
    2010 Chev 2500HD CC D/A (sold)
    2013 Chev 2500HD CC D/A (sold)
    2006 Chev 3500 CC D/A (sold)
    2005 Harley Ultra Classic (sold)

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