P0CC2
DTC P0CC1-P0CC4
Diagnostic Instructions
Danger: This diagnostic has NOT been validated on-vehicle. Follow all safety protocol and utilize all appropriate personal protective equipment to ensure your safety. Failure to follow the procedures exactly as written may result in serious injury or death.
* 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 "A" Coolant Pump Control Circuit/Open
DTC P0CC2
- Drive Motor "A" Coolant Pump Control Circuit Range/Performance
DTC P0CC3
- Drive Motor "A" Coolant Pump Control Circuit Low
DTC P0CC4
- Drive Motor "A" Coolant Pump Control Circuit High
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. 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 Cooling Schematics Hybrid Cooling Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Hybrid Cooling System 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
Circuit/System Verification
Ignition ON, command the Motor Coolant Pump Relay Enable ON and OFF with a scan tool. The G22 starter/generator control module coolant pump should turn ON and OFF when changing between the commanded states.
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.
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 exactly as written 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 #PIPXXYYZZ, 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 KR31 starter/generator coolant pump relay.
2. Ignition ON, test for less than 1 V between the control circuit terminal 30 and ground.
• If greater than the specified range, test the control circuit for a short to voltage.
3. Verify a test lamp illuminates between the B+ circuit terminal 86 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Verify a test lamp illuminates between the B+ circuit terminal 87 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit fuse is open, test the B+ circuit and the control circuit terminal 30 for a short to ground. If all circuits test normal, test or replace the G22 starter/generator control module coolant pump.
5. Ignition OFF, disconnect the harness connector at the G22 starter/generator control module coolant pump.
6. Test for less than 10 ohm between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the G22 starter/generator control module coolant pump.
8. Connect a 10 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30. Verify the G22 starter/generator control module coolant pump is activated.
• If the G22 starter/generator control module coolant pump is not activated, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the G22 starter/generator control module coolant pump.
9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
10. Command the Motor Coolant Pump Relay Enable ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K59 starter/generator control module.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K59 starter/generator control module.
11. If all circuits test normal, test or replace the KR31 starter/generator coolant pump relay
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Generator Control Module Coolant Pump Replacement Generator Control Module Coolant Pump Replacement
* Control Module References Control Module References for starter/generator control module replacement, programming, and setup