Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected that the temperature sensor for the battery's cooling system is reading a value that is too low. It's like a thermometer that's saying it's much colder than it actually is.
The P0C44 code is triggered when the powertrain control module (PCM) detects a low voltage signal from the battery pack coolant temperature sensor A, indicating a possible issue with the sensor or its circuit.
The battery pack coolant temperature sensor is responsible for monitoring the temperature of the coolant that helps keep the hybrid or electric vehicle's battery pack at the optimal temperature. A 'circuit low' condition suggests that the sensor is sending a voltage signal to the PCM that is lower than expected, which could be due to a wiring issue, a faulty sensor, or a problem with the PCM itself.
• Check Engine Light illuminated
• Possible reduced fuel efficiency
• Potential overheating of the battery pack
• Faulty battery pack coolant temperature sensor
• Damaged or corroded wiring/connectors in the sensor circuit
• Faulty PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the battery pack coolant temperature sensor and its wiring for damage.
• Test the sensor's resistance and compare it to the manufacturer's specifications.
• Replace the faulty battery pack coolant temperature sensor.
• Repair or replace damaged wiring/connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Digital multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect and maintain the battery cooling system.
• Ensure all electrical connections are clean and secure.
• Monitor the vehicle's performance for any unusual changes.
Sensor Issue
• Avoid driving the vehicle aggressively until the issue is resolved.
• Schedule a service appointment with a qualified technician.
Check with the vehicle manufacturer for warranty coverage on hybrid/EV components.
This code has become more common as hybrid and electric vehicles have become more prevalent, highlighting the importance of battery management systems.
Moderate – It's important to address this issue to prevent potential battery damage.
Driving with an unresolved issue related to the battery cooling system may lead to overheating and potential safety hazards.
• Engine running
• Battery cooling system operational
The battery pack coolant temperature sensor is typically located near the battery pack or within the cooling system of the hybrid/EV battery.
Q: Can I drive with a P0C44 code?
A: It's not recommended to drive for extended periods with this code active, as it may lead to battery overheating.
Q: How do I reset the P0C44 code?
A: After repairs, you can use an OBD-II scanner to clear the code, but ensure the issue is fixed first.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when coolant-temperature and warm-up faults indicate a thermostat-related issue.
Coolant-temperature and warm-up faults often lead to thermostat testing and replacement.
Thermostats are vehicle-specific and should be matched by engine and housing style.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.