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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
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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
    Forum tyhee Site Admin 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.
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  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
    Forum tyhee Site Admin 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.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


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