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 has detected a problem with the way it measures the voltage of the hybrid or electric vehicle's battery. It's like when a battery tester shows a number that's too high, and it might not be correct.
The vehicle's control module monitors the voltage of the hybrid/EV battery through specific circuits. When the voltage reading from the 'R' circuit is higher than expected, this code is triggered.
The P0B93 code is set when the Powertrain Control Module (PCM) or Battery Energy Control Module (BECM) detects an abnormally high voltage in the battery voltage sense 'R' circuit. This could be due to a fault in the voltage sensing circuit or an issue with the battery itself.
• Check Engine Light is on
• Reduced fuel efficiency
• Possible battery charging issues
• Faulty battery voltage sensor
• Damaged or corroded wiring or connectors
• Defective Battery Energy Control Module (BECM)
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.
• Test the battery voltage sensor 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 - $600
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect battery and wiring.
• Ensure proper maintenance of hybrid/EV systems.
• Avoid extreme temperatures that can affect battery performance.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional.
• Avoid driving long distances until the issue is resolved.
Check with your vehicle manufacturer for specific warranty coverage on hybrid/EV components.
This code has become more common as hybrid and electric vehicles have become more prevalent, highlighting the importance of battery management systems.
Moderate – Addressing this issue promptly can prevent further damage to the battery system.
Driving with a malfunctioning battery system can lead to reduced vehicle performance and potential safety risks.
• Vehicle at operating temperature
• Battery fully charged
The battery voltage sensor is typically located near the hybrid/EV battery pack, often integrated into the Battery Energy Control Module.
Q: Can I drive my car with a P0B93 code?
A: It's not recommended to drive for long distances, as this could lead to battery issues or reduced performance.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspection of the battery and its components can help prevent this issue.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.