P0C45
DTC P0C43-P0C45
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 P0C43
- Hybrid/EV Battery Pack Coolant Temperature Sensor 1 Performance
DTC P0C44
- Hybrid/EV Battery Pack Coolant Temperature Sensor 1 Circuit Low Voltage
DTC P0C45
- Hybrid/EV Battery Pack Coolant Temperature Sensor 1 Circuit High Voltage
Circuit/System Description
The hybrid/EV battery has 2 hybrid/EV battery pack coolant temperature sensors. The hybrid/EV battery pack coolant temperature sensors are located in the coolant inlet (sensor 1) and the outlet (sensor 2) of the hybrid/EV battery. The temperature sensor is a variable resistor that measures the temperature of the hybrid/EV battery coolant. The hybrid/EV battery pack coolant temperature sensor resistance changes with battery coolant temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The battery energy control module (BECM) uses the hybrid/EV battery temperature sensors to determine the hybrid/EV battery pack temperature to control the battery cooling and heating operations.
Conditions for Running the DTC
P0C43
* The ignition is ON.
* The 12 V battery voltage is greater than or equal 9 V.
* None of the following DTCs are set: P0C44, P0C45, P0C47, P0C4A, P0CD7, P0CD8, P1F18, or U0111.
* The coolant pump speed is greater than 20%.
P0C44
* The 12 V battery voltage is greater than 9 V.
* BECM is awake and communicating
* DTC P1A07 is not set.
P0C45
* The 12 V battery voltage is greater than 9 V.
* BECM is awake and communicating
* DTC P1A07 is not set.
Conditions for Setting the DTC
P0C43
The hybrid/EV battery pack coolant temperature sensor 1 reading is not within 28°C (50.4°F) of the hybrid/EV battery pack coolant temperature sensor 2 and is not within 28° C (50.4° F) of the Average Hybrid Battery Pack Temperature.
P0C44
The hybrid/EV battery pack coolant temperature sensor 1 is greater than 87.5°C (189.5°F).
P0C45
The hybrid/EV battery pack coolant temperature sensor 1 is less than or equal to -40°C (-40°F).
Action Taken When the DTC Sets
* DTC P0C43-P0C45 are type B DTCs.
* The active heating mode is disabled.
Conditions for Clearing the DTC
DTC P0C43-P0C45 are type B DTCs.
Diagnostic Aids
* Low or no coolant in the system may set a DTC P0C43.
* DTC P0C43-P0C45 will prevent battery heating and the vehicle will be unable to start in cold weather with battery temperatures below -25°C (-13°F).
Reference Information
Schematic Reference
Hybrid Cooling Schematics Hybrid Cooling Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
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 Programming and Relearning for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Vehicle in Service Mode, observe the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 parameter. The readings should be between -39 and +85°C (-38.2 and +185°F).
2. Compare the Hybrid/EV Battery Pack Coolant Temperature Sensor 1 and Hybrid/EV Battery Pack Coolant Temperature Sensor 2 parameters. The sensor readings should be within 28°C (50.4°F) of each other.
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 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 (1-877-446-8227) if you have any questions.
1. Verify that DTC P0AC1, P0B10, P0C44, P0C47, P0C4A or P1F18 is not set.
• If any DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Vehicle OFF, disable the high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.
3. Disconnect the harness connector at the B204A hybrid/EV battery pack coolant temperature sensor 1.
4. Test for less than 10 ohm between the low reference circuit terminal 1 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K16 battery energy control module.
Note: With the S15 manual service disconnect removed the 12 V battery connected and the Vehicle in Service Mode, may cause additional DTCs to set. Continue with diagnostics and clear any additional DTCs when repairs are complete.
5. Connect the 12 V battery.
6. Vehicle in Service Mode, verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 is less than -35° C (-38.2° F).
• If greater than the specified range, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K16 battery energy control module.
7. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Hybrid/EV Battery Pack Coolant Temperature Sensor 1 is greater than 80° C (176° F).
• If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K16 battery energy control module.
8. If all circuits test normal, replace the B204A hybrid/EV battery pack coolant temperature sensor 1.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Drive Motor Battery Wire Junction Block Relay Replacement Drive Motor Battery Wire Junction Block Relay Replacement
* Control Module References Programming and Relearning for battery energy control module replacement, programming and setup