The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs) and the hybrid powertrain control module (HPCM). Each MCM operates its respective drive motor generator based upon HPCM commands. Each MCM controls the speed, direction and output torque of its respective drive motor generator through the sequencing actuation of high current switching transistors called insulated gate bipolar transistors (IGBTs). Each drive motor generator operates utilizing 3-phase alternating current (ac) electricity. Each IGBT operates a single phase of the drive motor generator. Each phase is individually identified as U, V and W. Each MCM monitors the current of each phase in order to detect PIM overcurrent conditions.

Because all the motor generator phase circuits are electrically joined together, they should each flow about the same amount of current. The MCM performs a mathematical calculation to verify that the phase current sensors are accurate. If the U-V-W phase current sensors indicate about the same amount of phase current, the sum of the calculation should be near zero. If the U-V-W phase currents are not similar, this DTC will set.

The sum of the 3 phase current sensors is greater than 75 A.

DTCs P0BFD and P0BFE are Type A DTCs.

Schematic Reference

Hybrid Controls Schematics

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

1. Clear the DTC information.
2. Turn the ignition OFF for 2 minutes.
3. Turn the ignition ON.
4. Operate the vehicle within the conditions for running and setting.
5. Retest for the DTC.

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

•	Identify how to disable high voltage.

•	Identify how to test for the presence of high voltage.

•	Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Failure to follow the procedures exactly as written may result in serious injury or death.
1. Perform the High Voltage Disabling procedure for servicing at the drive motor generator control module cable connections.
2. Remove the 3-phase cable assembly from the PIM distribution box. Refer to Generator Control Module 3-Phase Cable Assembly Replacement.
3. Test the resistance to ground for each phase of the applicable drive motor generator by measuring between the following points with a DMM.

•	Phase U terminal and chassis ground

•	Phase V terminal and chassis ground

•	Phase W terminal and chassis ground

⇒	If infinite resistance is measured, replace the PIM and retest for DTCs. If P0BFD or P0BFE still resets, replace the 3-phase cable assembly and the drive motor generator assembly that corresponds to the set DTC.

⇒	If less than infinite is measured, continue with Circuit/System Testing.

4. Remove the 3-phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement. Ensure the terminals are not contacting chassis ground.
5. Retest the resistance to ground for each phase of the 3-phase cable. Measure between the following points with a DMM.

•	Phase U terminal and chassis ground

•	Phase V terminal and chassis ground

•	Phase W terminal and chassis ground

⇒	If infinite resistance is measured, replace the applicable drive motor generator.

⇒	If less than infinite is measured, replace the generator control module 3-phase cable assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.