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Thread: E35 Mode-22 PIDs

  1. #1
    Lifetime Member DURAtotheMAX's Avatar
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    Default E35 Mode-22 PIDs

    Does the LBZ/LMM ECM not support mode-22 PID request? Or am I just being stupid and doing something wrong.

    If I send it a mode-22 PID request for a known valid PID (say, fuel rail pressure ($0023), 7E0-03-22-00-23)....and it just sends back a negative response (service not supported).
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  2. #2
    Lifetime Member Chavez91's Avatar
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    I know that some ecms get pissy with out trailing zeros for some things, ie they expect certain data lengths of 7 or 8 bytes..... but i would assume mode 22 works? I was under the impression that EDGE use mode 22 exclusively. Atleast for everything that I have ever messed with they have.
    Josh

    '04 GMC LLY
    - L5P, Motech, 6-Spd Conv. ML Trans.
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  3. #3
    Lifetime Member DURAtotheMAX's Avatar
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    Quote Originally Posted by Chavez91 View Post
    I know that some ecms get pissy with out trailing zeros for some things, ie they expect certain data lengths of 7 or 8 bytes..... but i would assume mode 22 works? I was under the impression that EDGE use mode 22 exclusively. Atleast for everything that I have ever messed with they have.
    yeah I already tried padding with 00's. Still gives a negative response, mode not supported.

    Edge uses DPIDs (mode $2C) on GM's, at least on the [GM] CAN controllers. Ive never checked on the GM J1850 controllers.
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  4. #4
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    Dynamic PIDs is all I've ever used with E35. Kinda a pain to setup correctly, but flawless once ya get em stacked.

    PS. Many PIDs different between LBZ to LMM..

    Sent from my SAMSUNG-SM-G890A using Tapatalk

  5. #5
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by DURAtotheMAX View Post
    If I send it a mode-22 PID request for a known valid PID (say, fuel rail pressure ($0023), 7E0-03-22-00-23)....and it just sends back a negative response (service not supported).
    Is it definitely Mode not supported? Or Parameter not supported?

    Off the top of my head I can't remember on these if they support Mode $22, however GM tends to stick with Mode $2C as was posted above.

    Your message format does seem valid though, it should only be a 16 bit Identifier therefore it would seem silly to have to pad with 00's to get the byte count up to a full frame.

    Also with Mode $22 they tend to have pre-defined data streams (much like how the Dodge / Cummins ECM is).
    So sending a Mode $22,$0A,$00 (just made that up) might actually result in the ECM sending back data for 4 or 5 different things in the response.
    Last edited by GMPX; July 25th, 2019 at 10:14 AM.
    I no longer monitor the forum, please either post your question or create a support ticket.

  6. #6
    Lifetime Member DURAtotheMAX's Avatar
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    Quote Originally Posted by GMPX View Post
    Is it definitely Mode not supported? Or Parameter not supported?

    Off the top of my head I can't remember on these if they support Mode $22, however GM tends to stick with Mode $2C as was posted above.

    Your message format does seem valid though, it should only be a 16 bit Identifier therefore it would seem silly to have to pad with 00's to get the byte count up to a full frame.

    Also with Mode $22 they tend to have pre-defined data streams (much like how the Dodge / Cummins ECM is).
    So sending a Mode $22,$0A,$00 (just made that up) might actually result in the ECM sending back data for 4 or 5 different things in the response.
    Ross- sorry I missed this response!

    Its definitely a "service not supported" negative response. Maybe GM simply just chose to not support it on the LBZ/LMM because all of their scan tools always just use mode $2C DPID groups anyways... it works on the LML though, and im 98% sure it works on the L5P too.
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  7. #7
    Lifetime Member GMPX's Avatar
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    With Bosch who knows, it's not GM's code so I guess they didn't have full control over it.
    I no longer monitor the forum, please either post your question or create a support ticket.

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