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 fan that cools the battery in a hybrid or electric car isn't getting enough power to work properly. It's like when a fan in your room doesn't spin because it's not plugged in right.
The vehicle's computer has detected that the voltage supply to the cooling fan for the hybrid or electric vehicle's battery pack is lower than expected.
The P0BC0 code indicates a problem with the electrical circuit that supplies voltage to the cooling fan responsible for maintaining the temperature of the hybrid or EV battery pack. This could be due to a wiring issue, a faulty fan, or a problem with the power supply.
• Check Engine Light is on
• Reduced battery performance
• Overheating of the battery pack
• Faulty cooling fan
• Damaged wiring or connectors
• Faulty power supply or relay
Hybrid: A vehicle that uses both a gasoline engine and an electric motor.
EV: Electric Vehicle, a car powered entirely by electricity.
• Check for any blown fuses related to the cooling fan circuit.
• Inspect the wiring and connectors for any signs of damage or corrosion.
• Test the cooling fan operation and voltage supply.
• Replace or repair damaged wiring or connectors.
• Replace the faulty cooling fan.
• Check and replace any blown fuses or faulty relays.
• Multimeter
• OBD-II scanner
• Basic hand tools
$100 - $500
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect and maintain the cooling system.
• Ensure all electrical connections are secure and free from corrosion.
• Keep the battery pack area clean and free from obstructions.
Electrical Circuit Issue
• Do not ignore the warning light; get the vehicle checked promptly.
• Avoid driving in extreme temperatures until the issue is resolved.
Check with your vehicle manufacturer; cooling system components may be covered under warranty.
This code has become more common with the increase in hybrid and electric vehicles, highlighting the importance of battery cooling systems.
High – Ignoring this issue can lead to battery damage or reduced vehicle performance.
Driving with an overheating battery can be dangerous and may lead to further damage. Address this issue as soon as possible.
• Vehicle at operating temperature
• Battery cooling fan circuit engaged
The cooling fan is typically located near the hybrid or EV battery pack, often in the rear of the vehicle.
Q: Can I drive my car with this code?
A: It's not recommended to drive for long periods with this code, as it may lead to battery overheating.
Q: How can I prevent this issue?
A: Regular maintenance and inspections of the cooling system can help prevent this issue.
Budget · Enhanced code reader
A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
A dependable first-pass scanner for verifying the code and checking live data or readiness monitors.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for voltage, continuity, and basic electrical checks while narrowing down the fault.
View on Amazon
Universal · Socket set
A practical metric and SAE socket set for many diagnostic teardowns and component replacements.
Useful for common under-hood access and removal work during diagnosis or repair.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.