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 thinks there might be a problem with the battery in your hybrid or electric car, like it might not be properly separated from other parts of the car. This is important to keep everything safe.
The vehicle's control system has detected a potential issue with the isolation of the high-voltage battery, which could lead to unsafe conditions.
The P2C87 code indicates that the vehicle's onboard diagnostic system has detected a problem with the external isolation of the hybrid or electric vehicle's battery. This could mean that the battery is not properly isolated from the vehicle's chassis or other components, which could lead to electrical shorts or other safety issues.
• Warning light on the dashboard
• Reduced vehicle performance
• Inability to charge the battery
• Damaged battery insulation
• Faulty battery isolation sensor
• Corrosion or moisture in battery connections
Isolation: The process of keeping electrical components separate to prevent shorts and ensure safety.
Hybrid Vehicle: A vehicle that uses both an internal combustion engine and an electric motor.
• Check for any visible damage to the battery and its connections.
• Use a multimeter to test the battery isolation resistance.
• Inspect the battery isolation sensor for faults.
• Replace damaged insulation materials.
• Repair or replace faulty battery isolation sensor.
• Clean and secure battery connections.
• Multimeter
• Insulation resistance tester
• Basic hand tools
$200 - $800
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect battery connections.
• Keep the battery compartment dry and clean.
• Schedule routine maintenance checks.
Battery Isolation Issue
• Avoid driving the vehicle until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Check with your vehicle manufacturer as battery-related issues may be covered under warranty.
This code has become more common with the increase in hybrid and electric vehicle usage, highlighting the importance of battery safety.
High – This issue can pose a safety risk and should be addressed immediately.
Driving with this code active may violate safety regulations and could be dangerous.
• Vehicle in 'ON' mode
• Battery fully charged
The battery is usually located in the rear of the vehicle, often under the floor or in a dedicated compartment.
Q: Can I drive my car with a P2C87 code?
A: It's not recommended to drive the car as this code indicates a potential safety issue with the battery.
Q: How do I fix a P2C87 code?
A: You should have a professional inspect the battery and its isolation system to determine the cause and necessary repairs.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.