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Thread: MM3 Communication Time Out?

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    Jhorst02's Avatar

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    MM3 Communication Time Out?

    I keep getting an error after shutting my truck off in my tuner about a communication error.

    Has not always been this way.

    2014 with G56.

    Does anyone else have this issue, or can you fix it?

    I appreciate any help you can provide.




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    6.7 Coal Train's Avatar

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    MM3 Communication Time Out?

    Have you unplugged and re-plugged all of the connections to try and reset?

    I got that message when my MM3 was not firing right when I started my truck (it would take a minute or so before coming on), and I would tap the screen to try and get it to come on - I would get the error.

    Unplugging seemed to fix my problem.


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    MM3 Communication Time Out?

    It's the same issue for the last nine months but infrequent, and I didn't think much of it.

    I bought a new Suncoast Transmission 68RFE guardian, and I can't communicate with TCM via the Snap-on tool.

    Thinking there might be a corrupted file.


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