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 one of the battery cells in a hybrid or electric vehicle. It's like when a battery tester isn't working right and can't tell you how much power is left in a battery.
The vehicle's control module monitors the voltage of each cell in the hybrid or electric vehicle's battery pack. Code P0B7C indicates an issue with the voltage sensing circuit for a specific cell or group of cells, labeled as 'N'.
The P0B7C code is triggered when the Powertrain Control Module (PCM) or Battery Energy Control Module (BECM) detects an abnormal voltage reading from the voltage sense circuit associated with a specific cell or group of cells in the battery pack. This could be due to a wiring issue, a faulty sensor, or a defective battery cell.
• Check Engine Light is on
• Reduced fuel efficiency
• Limited power or performance
• Faulty battery cell
• Damaged wiring or connectors
• Defective voltage sensor
PCM: Powertrain Control Module
BECM: Battery Energy Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the battery pack and wiring for damage.
• Test the voltage sensor and associated circuits.
• Replace the faulty battery cell.
• Repair or replace damaged wiring or connectors.
• Replace the defective voltage sensor.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $1000
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular battery maintenance
• Routine inspection of electrical connections
• Avoiding extreme temperatures
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid driving long distances until the issue is resolved.
Check if the battery is covered under the vehicle's warranty, as hybrid/EV components often have extended coverage.
This code has become more common with the increase in hybrid and electric vehicles, highlighting the importance of battery management systems.
Moderate – While the vehicle may still operate, ignoring the issue can lead to reduced performance and efficiency.
Driving with a faulty battery sensor can lead to unexpected vehicle behavior. It is important to address this issue promptly to ensure safety and compliance with emissions regulations.
• Vehicle in 'Ready' mode
• Battery at normal operating temperature
The voltage sense circuit is located within the battery pack, which is typically under the vehicle's floor or in the trunk area.
Q: Can I drive my car with code P0B7C?
A: It's not recommended to drive for long periods with this code, as it can affect vehicle performance and efficiency.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspections of the battery and electrical systems can help prevent this issue.
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