DTC P0C43-P0C45
Diagnostic Instructions
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 12 V battery voltage is greater than or equal to 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 |
P0C45
| • | The 12 V battery voltage is greater than 9 V. |
| • | BECM is awake and communicating |
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
Connector End View Reference
Component Connector End Views
Description and Operation
Hybrid Cooling System Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
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
- 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).
- 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: High voltage enabling and disabling shall be only performed by High Voltage Qualified Technicians. The procedures for high-voltage enabling/disabling can be found in the service instructions and must be strictly followed at all times. The usage of the Protocol High Voltage Disabling/Enabling is mandatory. The High-Voltage Qualified Technician is responsible for the adherence to the manufacturer's service instructions as well as current national legal regulations.
Failure to follow the procedures exactly as written may result in serious injury or death.
Questions regarding training can be answered by your national training centre.
Danger: Any hybrid/EV battery pack replacement shall be performed by High-Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High-Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior to removal of the battery pack.
- Vehicle in Service Mode, verify that DTC P0AC1, P0B10, P0C44, P0C47, P0C4A or P1F18 is not set.
- If DTC P0C43, P0C44, or P0C45 is set, replace the A4 hybrid/EV battery pack.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References for battery energy control module replacement and hybrid battery interface control modules 1-4, programming and set-up for the hybrid/EV battery pack replacement. |
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