Having a problem accessing a litany of modules in GM, and when I plug in my J2534 to the obd port, the dash lights up every warning light and turns of the radio. Don't remember this happening previously.

Tags: maxisys

Tried on several vehicles and only seems to happen on general motors. Plugged in the
j-box to the obd port on an 07, for a check engine light diagnostics, upon plugging in
the j-box, almost every warning light on the dash illuminates, utilizing another scanner
reveals a loss of communication amongst several modules. Even eliminates the ability
to start the vehicle when the j-box is plugged in.