P0A2B and P0A31

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0A2C, P0A2D, P0AEF, P0AF0, P0BD3, P0BD4, P0BDD, P0BDE are not set.
Ignition ON after the engine has been OFF for at least 6 hours.
Average of phase U, V, W inverter temperatures is greater than -12°C (+10°F).
Motor temperature is greater than -40°C (-40°F).