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P0CC3





Generator Control Module Coolant Pump Malfunction - DTC P0CC1-P0CC4

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 Descriptors

DTC P0CC1
- Drive Motor Coolant Pump Control Circuit

DTC P0CC2
- Drive Motor Coolant Pump Performance

DTC P0CC3
- Drive Motor Coolant Pump Control Circuit Low Voltage

DTC P0CC4
- Drive Motor Coolant Pump Control Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The Starter/Generator Control Module coolant pump is a single speed ON/OFF pump that circulates coolant through the auxiliary radiator and the starter/generator to control the temperature of the starter/generator. The starter/generator cooling system is separate from the engine cooling system and does not share any coolant or components. The Starter/Generator Control Module coolant pump is controlled by the starter/generator coolant pump relay. This relay is a printed circuit board relay and integrated as part of the underhood fuse block. The relay switch and coil both receive B+. The Starter/Generator Control Module controls the relay coil by applying ground to the coil control circuit. With the coil grounded, the relay switch is closed and voltage is sent to the Starter/Generator Control Module coolant pump, which will begin circulating coolant.

The Starter/Generator Control Module uses the exponentially weighted moving average to calculate temperature fluctuations in the starter/generator cooling system. In addition, this diagnostic compares the temperature rate of change by a slope calculation within a set time when the Starter/Generator Control Module coolant pump turns ON. This diagnostic runs once after pump turns ON. If the temperature changes over time too quickly, the Starter/Generator Control Module will indicate a fault.

Conditions for Running the DTC

P0CC1 or P0CC3

* Ignition is RUN or CRANK

* Starter/generator control module coolant pump control is inactive

P0CC2

* Ignition is RUN or CRANK

* 12 V battery voltage is greater than 10 V

* Starter/generator control module coolant pump control is active

* DTC P0A2B, P0A2B, P0A2C, P0CC1, P0CC3, P0CC4, P0CBD, P0CBE, or P0CBF is not set

* The predicted difference between the coolant temperature in the starter/generator and the coolant temperature as measured by the hybrid electronics coolant temperature sensor is greater than 17°C (31°F)

P0CC4

* Ignition is RUN or CRANK

* Starter/generator control module coolant pump control is active

Conditions for Setting the DTC

P0CC1

An open is detected on the starter/generator coolant pump relay control circuit.

P0CC2

The coolant temperature is 0.25°C/s greater than the maximum cooling system performance temperature.

P0CC3

A short to ground is detected on the starter/generator coolant pump relay control circuit.

P0CC4

A short to voltage is detected on the starter/generator coolant pump relay control circuit.

Action Taken When the DTC Sets

DTCs P0CC1, P0CC2, P0CC3, and P0CC4 are type B DTCs

Conditions for Clearing the DTC

DTCs P0CC1, P0CC2, P0CC3, and P0CC4 are type B DTCs

Reference Information

Schematic Reference

Hybrid/EV Cooling Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Hybrid Cooling System Description and Operation

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

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

EL-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

1. Verify the coolant level of the starter/generator cooling system is normal.

• If the coolant level is low
Inspect the starter/generator cooling system for any leaks.

• If the coolant level is normal

2. Verify the starter/generator cooling system auxiliary radiator is clear of any debris, bent fins, or other damage which may inhibit airflow.

• If debris are found
Clean the auxiliary radiator.

• If damage is found
Replace the auxiliary radiator.

• If the coolant level is normal

3. Verify the starter/generator cooling system hoses are properly routed and are not kinked.

• If any hoses are improperly routed or kinked
Remove and properly route the hose.

• If all hoses are routed properly and are not kinked

4. Ignition ON.

5. Verify the G43 Starter/Generator Coolant Pump turns ON and OFF when commanding the Motor Coolant Pump Relay Enable ON and OFF with a scan tool. The G22 Starter/Generator Control Module coolant pump will make an audible noise during operation.

• If the G43 Starter/Generator Coolant Pump does not turn ON and OFF
Refer to Circuit/System Testing.

• If the G43 Starter/Generator Coolant Pump turns ON and OFF

6. All OK.

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 includes the following steps:


* 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.


Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:


* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.


* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.


- Visually and functionally inspect the gloves before use.


- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.


Failure to follow the procedures may result in serious injury or death.


Danger: The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.


1. Ignition OFF, disconnect the X2 harness connector at the K50A Fuse Block - Underhood.

2. Connect a test lamp between the control circuit terminal 11 and B+, ignition ON.

3. Verify the test lamp turns ON and OFF when commanding the Motor Coolant Pump Relay Enable ON and OFF with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, disconnect the harness connector at the K59 Starter/Generator Control Module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. Ignition OFF.

4. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K59 Starter/Generator Control Module.

• If the test lamp is always ON

1. Ignition OFF, disconnect the harness connector at the K59 Starter/Generator Control Module.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K59 Starter/Generator Control Module.

• If the test lamp turns ON and OFF

4. Ignition OFF and all vehicle systems OFF, connect the X2 harness connector at the K50A Fuse Block - Underhood. Disconnect the harness connector at the G43 Starter/Generator Coolant Pump. It may take up to 2 minutes for all vehicle systems to power down.

5. Test for less than 10 ohms between the ground circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

6. Connect a test lamp between the control circuit terminal 1 and ground.

7. Verify the test lamp turns ON and OFF when commanding the Motor Coolant Pump Relay Enable ON and OFF with a scan tool.

• If the test lamp is always OFF and the circuit fuse is good

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the X50A Fuse Block - Underhood.

• If the test lamp is always OFF and the circuit fuse is open

1. Ignition OFF.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, test or replace the G43 Starter/Generator Coolant Pump.

• If the test lamp is always ON

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the X50A Fuse Block - Underhood.

• If the test lamp turns ON and OFF

8. Test or replace the G43 Starter/Generator Coolant Pump.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Generator Control Module Coolant Pump Replacement

* Control Module References Control Module References for Starter/Generator Control Module replacement, programming, and setup

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