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Canbus Sniffing

Vauxhall_Mark
Vauxhall_Mark
in GM Discussion Forum

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#1

Has anyone got SavvyCan working to sniff GMLAN? Currently using an ESP32 but i do have a VCX Nano but that doesn't seem to want to sniff with SavvyCan

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    #2

    with an arduino works and to decode:

    https://github.com/BogGyver/opendbc/blob/tesla_unity_dev/gm_global_a_lowspeed_1818125.dbc

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    #3
    On 3/12/2026 at 11:18 AM, Arbe_gtc said:

    with an arduino works and to decode:

    https://github.com/BogGyver/opendbc/blob/tesla_unity_dev/gm_global_a_lowspeed_1818125.dbc

    Can you share the connection diagram? Do I need extra components to talk to a single wire on the 1st pin?

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    #4
    On 3/12/2026 at 8:38 AM, Vauxhall_Mark said:

    Has anyone got SavvyCan working to sniff GMLAN? Currently using an ESP32 but i do have a VCX Nano but that doesn't seem to want to sniff with SavvyCan

    SavvyCAN doesn't even have an option to set the CAN speed to 33.3kpbs.
    Can you also please share how do you connect a ESP to the bus?

    Edited by thxx

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