[eq1]

I pulled these from the list of Honda OBDII codes I have:

P1420 Nox Adsorptive Catalyst System Efficiency Below Threshold, Catalytic
converter
P1449 Battery Module Overheating, Comprehensive
P1601 IMA System Malfunction, Comprehensive

I didn't see a "1600"... Sounds like you may be right, that you broke something like a PTC sensor... I don't know whether or not you should flip the breaker. I'd guess that the whole system isn't working now that these codes have been thrown and you're not likely to be doing damage...