Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's battery charger is getting too much electricity, which can cause problems.
This code indicates that the voltage supplied to the Battery Charger B Module is higher than expected.
The P2E31 code is triggered when the Battery Charger B Module receives a supply voltage that exceeds the manufacturer's specified range. This could be due to an overcharging condition or a fault in the charging system.
• Battery warning light on
• Overheating battery
• Reduced battery life
• Faulty battery charger module
• Wiring issues causing high voltage
• Faulty voltage regulator
Battery Charger Module: A component that manages the charging of the vehicle's battery.
Voltage Regulator: A device that maintains a constant voltage level to the battery.
• Check battery voltage with a multimeter.
• Inspect wiring and connections to the battery charger module.
• Test the voltage regulator for proper operation.
• Replace faulty battery charger module.
• Repair or replace damaged wiring.
• Replace defective voltage regulator.
• Multimeter
• Wiring diagram
• Screwdriver set
$150 - $500
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regularly check battery voltage levels.
• Ensure charging system is maintained.
• Inspect wiring for damage periodically.
Electrical System Issue
• Avoid using high-power electrical accessories until fixed.
• Have the vehicle checked by a professional mechanic.
• Monitor battery temperature and performance.
Check with vehicle manufacturer for warranty coverage on electrical components.
This code has become more common with the increase of electric and hybrid vehicles, where charging systems are more complex.
Moderate – Should be addressed soon to prevent battery damage.
Driving with a malfunctioning charging system can lead to battery failure, which may cause the vehicle to become inoperable.
• Vehicle in 'On' position
• Battery fully charged
The Battery Charger B Module is typically located near the vehicle's battery or within the engine compartment.
Q: Can I drive with this code?
A: It's not recommended as it may lead to further battery or electrical system damage.
Q: Will this code clear itself?
A: The code may clear if the issue is resolved, but it's best to have it checked by a professional.
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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.
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