[Al Skierkiewicz]

In a four CIM drivetrain, dips below 6 volts are normal. It is for this reason that the dedicated boost/buck regulators on the PD exist. They keep the Crio and radio up down to about 4.5 volts. The PWM drivers drop out at about 5.5 volts so that motor drive usually is interrupted long enough for the voltage to rise and never reach the critical 4.5 volt range.