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 is having trouble getting a steady reading from a sensor that checks how hot or cold the liquid is that cools the big battery in a hybrid or electric car.
The P0C46 code is triggered when the vehicle's control module detects an intermittent or erratic signal from the battery pack coolant temperature sensor circuit.
The battery pack coolant temperature sensor monitors the temperature of the coolant used to keep the hybrid/EV battery pack at an optimal operating temperature. If the signal from this sensor is intermittent or erratic, it may indicate a faulty sensor, wiring issues, or a problem with the control module.
• Check Engine Light is on
• Reduced fuel efficiency
• Possible overheating of the battery pack
• Faulty battery pack coolant temperature sensor
• Damaged or corroded wiring/connectors
• Faulty control module
OBD-II: On-Board Diagnostics II, a standardized system for self-diagnostics and reporting in vehicles.
Coolant: A fluid used to regulate temperature in engines and battery systems.
• Perform a visual inspection of the sensor and wiring
• Use a multimeter to test the sensor's resistance
• Check for any stored trouble codes in the control module
• Replace the battery pack coolant temperature sensor
• Repair or replace damaged wiring or connectors
• Reprogram or replace the control module if necessary
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect the coolant system
• Ensure proper coolant levels
• Perform routine maintenance checks
Sensor Issue
• Avoid extreme temperatures when possible
• Schedule regular maintenance checks
• Monitor vehicle performance for any changes
Check with the vehicle manufacturer for warranty coverage on hybrid/EV components.
This code has become more common with the increased use of hybrid and electric vehicles, highlighting the importance of battery cooling systems.
Moderate – It should be addressed soon to prevent potential battery damage.
Ignoring this code may lead to battery overheating, which can be a safety hazard.
• Vehicle at operating temperature
• Battery cooling system active
The battery pack coolant temperature sensor is typically located near the battery pack, within the cooling system.
Q: Can I drive with a P0C46 code?
A: It's not recommended as it may lead to battery overheating and reduced efficiency.
Q: How do I reset the P0C46 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is resolved first.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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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.