P0C04

DTC P0C01 or P0C04

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P0C01
- Drive Motor 1 Overcurrent

DTC P0C04
- Drive Motor 2 Overcurrent

Circuit/System Description

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 drive motor generator 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 utilizing 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 drive motor generator power inverter module overcurrent conditions. The motor control modules are part of the drive motor generator power inverter module, and are not serviced separately.

Conditions for Running the DTC

The hybrid wakeup circuit is active.

Conditions for Setting the DTC

One or more phase currents are greater than 680 A.

Action Taken When the DTC Sets

* DTCs P0C01 and P0C04 are Type A DTCs.
* The drive motor generator power inverter module commands the battery energy control module to open the high voltage contactor relays.

Conditions for Clearing the DTC

DTCs P0C01 and P0C04 are Type A DTCs.

Reference Information
Schematic Reference

Hybrid Controls Schematics Hybrid Controls Schematics
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

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

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 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 High Voltage Disabling.
2. Ignition OFF, disconnect the appropriate 3-phase cable assembly from the T6 drive motor generator power inverter module listed below. Refer to Generator Control Module 3-Phase Cable Assembly Replacement Generator Control Module 3-Phase Cable Assembly Replacement.

Drive Motor 1
* X7 phase U
* X8 phase V
* X9 phase W

Drive Motor 2
* X10 phase U
* X11 phase V
* X12 phase W

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

Drive Motor 1
* X7 terminal phase U
* X8 terminal phase V
* X9 terminal phase W

Drive Motor 2
* X10 terminal phase U
* X11 terminal phase V
* X12 terminal phase W

• If disconnect the 3-phase cable assembly from the T12 automatic transmission assembly. Refer to Generator Control Module 3-Phase Cable Assembly Replacement Generator Control Module 3-Phase Cable Assembly Replacement. Ensure the terminals are not contacting chassis ground. Test the circuits for short to ground. If the circuits test normal, replace the M15 drive motor.

4. Replace the T6 drive motor generator power inverter module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Control Module References Control Module References for Drive Motor Generator Power Inverter Module replacement, setup, and programming.
* Generator Control Module 3-Phase Cable Assembly Replacement Generator Control Module 3-Phase Cable Assembly Replacement
* Drive Motor with Generator Assembly Removal - 1st Position 8. Drive Motor with Generator Assembly Removal - 1st Position
* Drive Motor with Generator Assembly Removal - 2nd Position 13. Drive Motor with Generator Assembly Removal - 2nd Position