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 saying that one of the sensors checking the battery's voltage is reading too high, like a thermometer showing a temperature that's too hot.
This code indicates that the voltage reading from the battery voltage sense circuit B is higher than the expected range.
The P0B43 code is triggered when the vehicle's powertrain control module (PCM) or battery management system (BMS) detects an abnormally high voltage reading from the voltage sense circuit B of the hybrid or electric vehicle battery. This could be due to a malfunctioning sensor, wiring issues, or a problem within the battery itself.
• Check engine light is on
• Reduced fuel efficiency
• Possible battery performance issues
• Faulty battery voltage sensor
• Wiring issues or poor connections
• Battery management system malfunction
PCM: Powertrain Control Module
BMS: Battery Management System
• Scan the vehicle for additional codes
• Inspect the battery voltage sensor and wiring
• Test the battery management system
• Replace faulty battery voltage sensor
• Repair or replace damaged wiring
• Reprogram or replace the battery management system
• OBD-II scanner
• Multimeter
• Battery terminal cleaner
$150 - $500
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular battery maintenance
• Ensure all connections are secure
• Periodic system diagnostics
Sensor Issue
• Avoid driving long distances until repaired
• Monitor battery performance
• Consult a professional mechanic
Check with the vehicle manufacturer for battery and hybrid system warranty coverage.
This code has become more common with the increased use of hybrid and electric vehicles, as battery management systems become more complex.
Moderate – While the vehicle may still operate, ignoring this code could lead to reduced battery performance or other issues.
Driving with a malfunctioning battery system can lead to reduced vehicle performance and efficiency. It is recommended to address this issue promptly.
• Vehicle in park with engine off
• Battery fully charged
The battery voltage sensor is typically located near or within the battery pack of the hybrid or electric vehicle.
Q: Can I drive my car with a P0B43 code?
A: While you may be able to drive, it's best to have the issue checked to avoid potential battery damage.
Q: How do I reset the P0B43 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is resolved first.
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