A vehicle powertrain includes a power inverter and a controller. The power inverter includes a load switch monolithically integrated with a mirror switch, and a current sensor configured to measure current through the load switch to provide current feedback for vector control of a motor. The controller may be configured to, responsive to a difference between a mirror current of the mirror switch and an output of the current sensor resulting from temperature changes of the load switch, operate the power inverter to reduce a temperature of the load switch.