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After I got my Banks Data Monster gage "permanently" (i.e. always plugged in) connected to the OBD2 port, OnStar starting sending me diagnostic reports that said:
"We were unable to successfully complete a diagnostic test. This issue may be caused by an aftermarket device plugged into your vehicle's diagnostic port."
Is it POSSIBLE that the presence of the gage might also therefor be preventing transmission of drving data?
Jim G
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