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Yes, I do think an overly high voltage is the issue here. The buddy pack still rests way over 117 Volt. But once connected the IMA battery pulls down the voltage to around 110 Volt and still causes the error.
I could drive for a minute or more without issue. What triggered the error was when I started to use EV mode. That drops the IMA pack voltage and increases the current flowing in from my buddy pack.
I may use a lamp for a shunt to reduce the voltage difference and current.
I will make a driver side controller with a 3 way switch; off, on, lamp. And probably a voltage and current flow meter with an isolated power source. As I feel I need more insight (!) into the conditions that trigger the errors.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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