Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble reading the temperature of the battery's cooling system. It's like a thermometer that sometimes works and sometimes doesn't.
This code indicates that the temperature sensor for the battery pack's coolant is sending erratic or inconsistent signals to the vehicle's computer.
The Hybrid/EV Battery Pack Coolant Temperature Sensor D is responsible for monitoring the temperature of the coolant that helps keep the battery pack at an optimal temperature. If the sensor's signal is intermittent or erratic, it may cause the vehicle's computer to misinterpret the battery's cooling needs, potentially leading to overheating or inefficient cooling.
• Check engine light on
• Erratic cooling fan operation
• Reduced battery performance
• Faulty temperature sensor
• Wiring issues such as a loose connection or damaged wires
• Malfunctioning control module
OBD-II: On-Board Diagnostics, a system that monitors vehicle performance.
Coolant: A fluid used to regulate temperature in engines and batteries.
• Check for any loose or damaged wiring connected to the sensor.
• Test the sensor's output with a multimeter to ensure it's functioning properly.
• Inspect the control module for any signs of damage or malfunction.
• Replace the faulty temperature sensor.
• Repair or replace damaged wiring.
• Reprogram or replace the control module if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $400
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect and maintain the vehicle's cooling system.
• Ensure all electrical connections are secure.
• Perform routine diagnostic checks.
Sensor Issue
• Avoid driving the vehicle aggressively until the issue is resolved.
• Monitor the vehicle's performance and report any unusual behavior to a mechanic.
Check with the vehicle manufacturer for warranty coverage on hybrid/EV components.
This code has been increasingly reported as hybrid and electric vehicles become more prevalent, highlighting the importance of maintaining battery cooling systems.
Moderate – Addressing this issue in a timely manner can prevent potential battery damage.
Ignoring this code may lead to overheating, which can cause battery damage and pose safety risks.
• Vehicle at operating temperature
• Engine running
The temperature sensor is typically located near the battery pack within the vehicle's cooling system.
Q: Can I drive my vehicle with this code?
A: It's not recommended to drive extensively with this code active, as it could lead to battery overheating.
Q: How can I reset the check engine light?
A: Use an OBD-II scanner to clear the code, but ensure the issue is fixed to prevent the light from coming back on.
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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.