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2020 Prius Prime (plugin basic) won't start in extreme cold.

Mods please move this if required.

I joined this group in hopes that someone may have an answer for my problem as per below:

Equipped;
2020 Prius prime (plugin basic)
-30+ C weather in NWT Canada
Fully charged LILO battery
Fully charged 12v battery
Battery blanket, Block heater and
Synthetic oil rated for NWT winters.


Attempt to start;
Break peddle down, push button, electronics (lights Nav etc) work. Engine does not crank, nor does EV mode engage.

I am at my wits end. Is this a design flaw for -30C++ (-50C) weather?

Thoughts?