Volt

DTC P0C01 or P0C04

The power inverter module, often referred to as the drive motor generator power inverter module, contains two motor control modules and the hybrid powertrain control module. Each motor control module operates its respective drive motor generator based upon power inverter module commands. Each motor control modules 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. Each drive motor generator operates utilising 3-phase AC electricity. Each insulated gate bipolar transistor operates a single phase of the drive motor generator. Each phase is individually identified as U, V and W. Each motor control module monitors the current of each phase in order to detect power inverter module over-current conditions. The motor control modules are part of the power inverter module and are not serviced separately.

The hybrid wake-up circuit is active.

One or more phase currents are greater than 725 A.

DTCs P0C01 and P0C04 are Type A DTCs.

Schematic Reference

Hybrid Controls Schematics

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

If the DTC is set, clear DTC; Turn the vehicle OFF for 2 minutes. Turn vehicle ON, Operate vehicle within conditions for running and setting DTC. If the DTC resets, go to Circuit/System Testing.

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 conditions 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 .
2. Vehicle OFF, disconnect the appropriate 3-phase cable assembly from the T6 power inverter module listed below. Refer to Hybrid Controls Electronic Component Views Figure 2: High Voltage Terminal Locator.

Drive Motor 1

•	X5 phase U terminal 3

•	X5 phase V terminal 2

•	X5 phase W terminal 1

Drive Motor 2

•	X6 phase U terminal 3

•	X6 phase V terminal 2

•	X6 phase W terminal 1

3. Test for infinite resistance to circuit terminals listed below and earth:

Drive Motor 1

•	X5 phase U terminal 3

•	X5 phase V terminal 2

•	X5 phase W terminal 1

Drive Motor 2

•	X6 phase U terminal 3

•	X6 phase V terminal 2

•	X6 phase W terminal 1

⇒

If disconnect the 3-phase cable assembly from the T12 automatic transmission assembly. Refer to Drive Motor Generator Rotor and Stator Removal - Unit A and Drive Motor Generator Rotor and Stator Removal - Unit B . Ensure the terminals are not contacting chassis earth. Test the circuits for a short-circuit to earth. If the circuits test normal, replace the M15 drive motor.

4. Replace the T6 power inverter module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.