P0C32
DTC P0C32
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 P0C32
- Hybrid/EV Battery Pack Cooling System Performance
Circuit/System Description
The hybrid/EV powertrain control module 2 will monitor the battery temperature and set a DTC if the battery temperature can not be properly maintained.
Conditions for Running the DTC
* The 12 V system voltage is greater than 9 V.
* The vehicle is in propulsion system active mode.
OR
* The vehicle is plugged into an AC source.
* DTC P1EC6 heater performance diagnostic, DTC P0C4A pump performance diagnostic and DTC P0534 R134A low-charge detection have completed
* The following DTCs are not set; P0534, P0C47, P0C4A, P0CE0, P0CE2, P0CE3, P1A5A, P1EC6, P1EC7, P1EC8, P1F18
Conditions for Setting the DTC
* The vehicle is in Active Cooling mode.
* The Battery Average Temperature continuously exceeds 45°C (113°F) for 5 minutes.
OR
* The vehicle is in Active Heating mode.
* The Battery Average Temperature is continuously below -25°C (-13°F) for 50 minutes.
Action Taken When the DTC Sets
DTC P0C32 is a type A DTC.
Conditions for Clearing the DTC
DTC P0C32 is a type A DTC.
Diagnostic Aids
* The hybrid/EV battery pack coolant pump may be faulty.
* The hybrid/EV battery pack coolant control valve may be leaking internally.
* The hybrid/EV battery pack heater may be defective.
* The hybrid/EV battery coolant level may be low or there may be no coolant.
* The AC refrigerant level may be low or the AC chiller may be inoperative.
* The hybrid/EV battery coolant lines may be restricted or blocked.
Reference Information
Schematic Reference
* Hybrid Cooling Schematics Hybrid Cooling Schematics
* HVAC Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
Drive Motor Battery System Description Drive Motor Battery System Description
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 Programming and Relearning for scan tool information
Circuit/System Verification
Danger: The Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center if you have any questions.
1. Vehicle in Service Mode, verify that DTCs P0C47, P0C4A, P0CE0, P0CE2, P0CE3, P0CE6, P0CE7, P148A, P148B, P148C, P1EBE, P1EBF, P1EC3, P1EC4, P1EC5, P1EC6, P1EC7, P1EC8, or P1F18 is not set.
• If any of the DTCs is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle
2. Vehicle in Service Mode, with the hybrid/EV battery pack coolant pump is disabled and not running, verify the scan tool parameters listed below:
* Hybrid/EV Battery Pack Coolant Pump Command is less than 10%.
* Hybrid/EV Battery Pack Coolant Pump Feedback is 0%.
* Hybrid/EV Battery Pack Coolant Pump Speed is 25 RPM.
• With the hybrid/EV battery pack coolant pump is disabled and not running and the scan tool parameters listed are not the specified values, refer to Hybrid/EV Battery Pack Coolant Pump Malfunction - DTC P0C47, P0C4A, or P1F18 P0C47.
3. Vehicle OFF, connect the charge cord set. With the vehicle in Charge Mode, the hybrid/EV battery pack coolant pump enabled and not running, verify the scan tool parameters listed below:
* Hybrid/EV Battery Pack Coolant Pump Command is 10%.
* Hybrid/EV Battery Pack Coolant Pump Feedback to be 50% +/-5%.
* Hybrid/EV Battery Pack Coolant Pump Speed is 50 RPM.
• With the vehicle in Charge Mode, the hybrid/EV battery pack coolant pump enabled and not running and the scan tool parameters listed are not the specified values, refer to Hybrid/EV Battery Pack Coolant Pump Malfunction - DTC P0C47, P0C4A, or P1F18 P0C47.
Note: The vehicle must be in Charge Mode and the pump is enabled and not running before proceeding to the next step.
4. Vehicle in Service Mode, command the Hybrid/EV Battery Pack Coolant Pump Heater to 90 kW with a scan tool. Observe the Hybrid/EV Battery Pack Coolant Pump Temperature Sensor 1 parameter. The temperature reading should rise after a 15 second delay, +/- 10 seconds, to above 54° C +/-5° C (129.2° F +/-10°).
• With the vehicle in Charge Mode, Vehicle in Service Mode, Hybrid/EV Battery Pack Coolant Pump Heater commanded to 90 kW and the Hybrid/EV Battery Pack Coolant Pump Temperature Sensor 1 temperature is less than the specified value, refer to Circuit/System Testing.
Note: The hybrid/EV powertrain control module 2 will turn on the hybrid/EV battery pack coolant pump once a calibrated temperature is reached.
Note: Do not run the test for more than 15 seconds after the Hybrid/EV Battery Pack Coolant Pump Temperature Sensor 1 reaches 54° C (129.2° F).
5. With the hybrid/EV battery pack coolant pump enabled and running with the Hybrid/EV Battery Pack Coolant Pump Temperature Sensor 1 parameter above 54° C +/-5° C (129.2° F +/-10°), verify the scan tool parameters listed below:
* Hybrid/EV Battery Pack Coolant Pump Command to be greater than 10%.
* Hybrid/EV Battery Pack Coolant Pump Feedback to be 50% +/-5%.
* Hybrid/EV Battery Pack Coolant Pump Speed is greater than 50 RPM.
• With the vehicle in Charge Mode, Vehicle in Service Mode, the hybrid/EV battery pack coolant pump enabled and running and the scan tool parameters listed are not the specified values, refer to Hybrid/EV Battery Pack Coolant Pump Malfunction - DTC P0C47, P0C4A, or P1F18 P0C47.
6. Verify that the Hybrid/EV Battery Pack Coolant Pump Temperature Sensor 1 parameter dropped to below 40° C (104° F) after a 15 second delay, +/- 10 seconds, with the hybrid/EV battery pack coolant pump running.
• The Hybrid/EV Battery Pack Coolant Pump Temperature Sensor 1 parameter did not drop to below 40° C (104° F) with the hybrid/EV battery pack coolant pump running. Refer to Hybrid/EV Battery Cooling Diagnostic Hybrid/EV Battery Cooling Diagnostic
7. Observe the scan tool Battery Average Temperature parameter. The reading should be above -25°C ( -13°F) and below 45° C (113° F).
• If the reading is below -25°C ( -13°F) refer to Hybrid/EV Battery Cooling Diagnostic Hybrid/EV Battery Cooling Diagnostic.
• If the reading is above 45°C (113°F) refer to Hybrid/EV Battery Cooling Diagnostic Hybrid/EV Battery Cooling Diagnostic.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.