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 reading the temperature of the coolant that keeps the electronics cool in a hybrid or electric vehicle.
The P2B25 code indicates an issue with the range or performance of the coolant temperature sensor circuit for the electronics in a hybrid or electric vehicle.
The Hybrid/EV Electronics Coolant Temperature Sensor C is responsible for monitoring the temperature of the coolant used to keep the electronic components at an optimal temperature. If the sensor's readings are outside the expected range, the vehicle's computer will trigger the P2B25 code.
• Check Engine Light is on
• Overheating of electronic components
• Reduced vehicle performance
• Faulty coolant temperature sensor
• Wiring issues in the sensor circuit
• Malfunctioning electronic control unit (ECU)
Coolant: A fluid used to keep the engine and electronic components from overheating.
ECU: Electronic Control Unit, the computer that controls various functions in the vehicle.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections of the temperature sensor.
• Test the sensor's resistance and compare it to specifications.
• Replace the coolant temperature sensor.
• Repair or replace damaged wiring.
• Reprogram or replace the ECU if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular maintenance of the cooling system
• Periodic inspection of sensor connections
• Use quality parts for replacements
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional.
• Avoid driving the vehicle if it shows signs of overheating.
Check with the vehicle manufacturer for specific warranty coverage related to the cooling system and sensors.
This code has become more common with the increased use of hybrid and electric vehicles, as they rely heavily on electronics that require efficient cooling.
Moderate – While the vehicle may still operate, ignoring the issue can lead to overheating and potential damage to electronic components.
Operating a vehicle with a malfunctioning cooling system can lead to safety hazards and is not recommended.
• Engine at operating temperature
• Vehicle stationary
The coolant temperature sensor is typically located near the radiator or within the cooling system of the electronics compartment.
Q: Can I drive with a P2B25 code?
A: It's not recommended to drive with this code active, as it may lead to overheating of electronic components.
Q: How do I reset the P2B25 code?
A: After addressing the issue, you can use an OBD-II scanner to clear the code. However, ensure the problem is fixed first.
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Universal · Digital multimeter
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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.