P0C01
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 High Current
DTC P0C04
- Drive Motor 2 High Current
Circuit/System Description
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 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 power inverter module overcurrent conditions. The motor control modules are part of the 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 725 A.
Action Taken When the DTC Sets
* DTCs P0C01 and P0C04 are Type A DTCs.
* The power inverter module requests the hybrid powertrain control module 2 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 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.
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. Vehicle OFF, disconnect the appropriate 3-phase cable assembly from the T6 power inverter module listed below. Refer to Hybrid Controls Electronic Component Views 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 ground:
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 11. Drive Motor Generator Rotor and Stator Removal - Unit A and Drive Motor Generator Rotor, Stator, and Output Sun Gear Shaft Removal - Unit B 18. Drive Motor Generator Rotor, Stator, and Output Sun Gear Shaft Removal - Unit B. 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 power inverter module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Drive Motor Generator Rotor and Stator Removal - Unit A 11. Drive Motor Generator Rotor and Stator Removal - Unit A for Drive Motor 1, 3-Phase Cable Assembly replacement
* Drive Motor Generator Rotor, Stator, and Output Sun Gear Shaft Removal - Unit B 18. Drive Motor Generator Rotor, Stator, and Output Sun Gear Shaft Removal - Unit B for Drive Motor 2, 3-Phase Cable Assembly replacement
* Control Module References Programming and Relearning for Drive Motor Generator Power Inverter Module, also called the power inverter module, replacement, programming, and setup.