2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1503
Important: Diagnose ECM DTCs P0335 and P0336 prior to performing this procedure.
1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Attempt to start the engine.
4. Retest for DTC P0C2F.
Circuit/System Testing
Important: Diagnose ECM DTCs P0335 and P0336 prior to performing this procedure.
1. Repair the following conditions if observed:
* ECM CKP sensor DTCs
Important: If mechanical binding of the engine is observed, internal transmission damage may have resulted when drive motor 1
attempted to crank the seized engine.
* Mechanical condition which would cause drive motor 1 to rotate without a corresponding rotation of the engine.
2. Ignition ON, retest for DTC P02CF.
锟斤拷If the DTC resets, test each drive motor generator position sensor for proper operation. Refer to DTC P1B03 or P1B04 (See: P Code
Charts/P1B03).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
P0C04
DTC P0C01 or P0C04
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/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 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.
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
