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 voltage from one part of the hybrid or electric car battery. It's like trying to read a book with missing pages.
The vehicle's control module has detected an issue with the voltage sensing circuit for the hybrid or electric vehicle battery, specifically in the 'L' circuit.
The P0B72 code is triggered when the powertrain control module (PCM) or battery energy control module (BECM) detects a malfunction in the voltage sensing circuit of the hybrid/EV battery, specifically in the 'L' circuit. This could be due to a faulty sensor, wiring issues, or a problem within the battery pack itself.
• Check Engine Light or Hybrid System Warning Light is on
• Reduced fuel efficiency
• Limited or no electric driving capability
• Faulty battery voltage sensor
• Damaged or corroded wiring or connectors
• Malfunctioning battery energy control module
PCM: Powertrain Control Module
BECM: Battery Energy Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the battery voltage sensor and related wiring for damage or corrosion.
• Test the battery energy control module for proper operation.
• Replace the faulty battery voltage sensor.
• Repair or replace damaged wiring or connectors.
• Replace the battery energy control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $1000
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect battery connections and wiring.
• Ensure the hybrid/EV battery is serviced according to the manufacturer's schedule.
• Avoid exposing the vehicle to extreme temperatures.
Sensor Issue
• Have the vehicle inspected by a professional as soon as possible.
• Avoid driving long distances until the issue is resolved.
Check with the vehicle manufacturer for specific battery warranty coverage, as hybrid/EV components often have extended warranties.
This code has become more common as hybrid and electric vehicles have increased in popularity. It often indicates issues related to the complexity of battery management systems.
Moderate – While the vehicle may still be drivable, it is important to address this issue to prevent further damage and maintain efficiency.
Driving with a malfunctioning hybrid/EV battery system can lead to decreased performance and may not meet emissions standards.
• Vehicle at operating temperature
• Battery at a stable charge level
The battery voltage sensor is typically located within or near the hybrid/EV battery pack.
Q: Can I drive my car with code P0B72?
A: It's possible, but not recommended. Driving with this code can lead to reduced performance and efficiency.
Q: How do I reset the P0B72 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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