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 having trouble reading the battery's voltage correctly because the signal is not stable.
This code indicates that the voltage signal from the hybrid or electric vehicle's battery is not consistent, which could be due to an electrical issue.
The P0B44 code is triggered when the powertrain control module (PCM) detects an intermittent or erratic signal from the voltage sense B circuit of the hybrid or electric vehicle's battery. This could be due to wiring issues, a faulty sensor, or a bad connection.
• Check engine light is on
• Reduced fuel efficiency
• Possible battery charging issues
• Faulty battery voltage sensor
• Loose or corroded electrical connections
• Damaged wiring in the voltage sense circuit
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the battery voltage sensor and its connections.
• Check the wiring for any signs of damage or corrosion.
• Replace the faulty battery voltage sensor.
• Repair or replace damaged wiring.
• Clean and secure electrical connections.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect battery connections.
• Keep the battery and its components clean.
• Schedule routine maintenance checks.
Sensor Issue
• Do not ignore the check engine light.
• Have your vehicle inspected by a professional.
• Monitor your vehicle's performance for any changes.
Check your vehicle's warranty for coverage on hybrid/EV components.
This code has become more common with the increase in hybrid and electric vehicles.
Moderate – Addressing this issue promptly can prevent further complications.
Driving with a malfunctioning battery sensor can lead to reduced performance and efficiency.
• Vehicle must be in a safe and stable condition.
• Ensure the battery is fully charged.
The battery voltage sensor is typically located near the battery pack of the vehicle.
Q: Can I still drive my car with this code?
A: Yes, but it's recommended to have it checked soon to avoid potential issues.
Q: Will this code affect my car's performance?
A: It might lead to reduced efficiency and performance if not addressed.
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.