P0C11

DTC P0C11-P0C16

Diagnostic Instructions

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

DTC Descriptor

DTC P0C11
- Drive Motor 1 Inverter Phase U Overtemperature

DTC P0C12
- Drive Motor 1 Inverter Phase V Overtemperature

DTC P0C13
- Drive Motor 1 Inverter Phase W Overtemperature

DTC P0C14
- Drive Motor 2 Inverter Phase U Overtemperature

DTC P0C15
- Drive Motor 2 Inverter Phase V Overtemperature

DTC P0C16
- Drive Motor 2 Inverter Phase W Overtemperature

Circuit/System Description

The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs). Each MCM operates its respective drive motor generator based upon hybrid powertrain control module (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 temperature of each phase in order to detect PIM overtemperature conditions.

Conditions for Running the DTC

* The high voltage contactor relays are closed.
* Ignition voltage is 8-18 volts.
* DTCs P0AEF and P0AF0 are not set.

Conditions for Setting the DTC

The phase temperature had exceeded 100°C (212°F) and then had not fallen below 85°C (185°F) within a 3.125 milliseconds sample time.

Action Taken When the DTC Sets

* DTCs P0C11, P0C12, P0C13, P0C14, P0C15 and P0C16 are Type B DTCs.
* The PIM commands the battery energy control module (BECM) to open the high voltage relay contactors.

Conditions for Clearing the DTC

DTCs P0C11, P0C12, P0C13, P0C14, P0C15 and P0C16 are Type B DTCs.

Circuit/System Verification

1. Review the Failure Records when the DTC set.

^ If the engine coolant temperature (ECT) was above 125°C (257°F) when the DTC set, go to Symptoms - Cooling System and correct that concern first. Symptom Related Diagnostic Procedures

2. Operate the vehicle while monitoring the phase circuit temperature with the scan tool.
3. If the phase temperature is more than 100°C (212°F) proceed with Circuit/System Testing.

Circuit/System Testing

1. Inspect for proper coolant level in the hybrid cooling system reservoir.

^ If coolant level is low refer to Generator Control Module Cooling System Draining and Filling.

2. Inspect the hybrid cooling system radiator for debris or obstruction.

^ If a concern is found, repair or replace the restricted or damaged components as necessary.

3. Inspect for proper operation of all hybrid system coolant pumps.

^ If a concern is found, repair or replace the coolant pumps as necessary.

4. Command the cooling fans through all operating speeds.

^ If the cooling fans do not operate in all speeds, refer to Cooling Fan Inoperative (w/o LFA) Cooling Fan Inoperative (w/ LFA). Cooling Fan Inoperative

5. If the above inspections do not identify a concern, disassemble the drive motor generator control module assembly and inspect the drive motor generator power inverter module (PIM) cooling surface for excessive corrosion or contamination restriction. Refer to Drive Motor Generator Power Inverter Module Removal and Installation.

^ If a concern is found, clean the PIM cooling surface or replace the PIM as necessary.

Repair Instructions

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