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definitely would need a tweak on the tool side of things, but otherwise looks harmless. i'd just put ignition voltage in there, since if that's out of range, that is something the user is able to solve. knowing the vpp voltage might be academic, as good battery voltage should mean good vpp voltage unless there's damage to the ECM itself. the only person that's ever reported the vpp voltage out of range error to me opened his ECM and found it full of moisture damage.
Agree, but it does tell you that & more info is always better in my estimation. Cost is one byte = no time.