What Does P0B14 Mean?
The battery management system has detected a general circuit fault with the secondary ("B") hybrid battery pack voltage sensing circuit. This circuit measures the total pack voltage or a section of the pack as a secondary/redundant measurement. A circuit fault means the voltage reading is absent, fixed, or outside the valid signal range. Without accurate voltage sensing, the system cannot properly manage battery charging, discharging, and safety limits.
Safety Warning
Accurate battery voltage measurement is essential for safe operation — it prevents overcharging and deep discharging that can lead to cell damage or thermal events. Loss of the redundant voltage sense circuit reduces safety monitoring capability. The vehicle may limit power or disable hybrid operation. All work requires high-voltage safety training and proper PPE.
Common Causes
30%
Faulty voltage sense circuit or measurement IC in the battery management module
25%
Open or damaged voltage sense wiring between the battery pack tap point and the module
20%
Corroded or loose connection at the battery pack voltage tap point
15%
Blown sense circuit fuse (some vehicles use low-amperage fuses on voltage sense lines)
10%
Battery management module connector damage or water intrusion
Diagnostic Steps
1
Read freeze frame data and check for companion DTCs on the voltage sense A circuit. If both A and B circuits are faulted, suspect a common cause such as module power/ground or CAN communication issue.
2
Monitor voltage sense B reading in live data and compare with voltage sense A. With a healthy battery, both should read the same or very similar values. A zero or fixed reading on sense B confirms the circuit fault.
3
Inspect the voltage sense wiring and connector at the battery management module. Check for corrosion, backed-out pins, or physical damage. Follow high-voltage safety procedures.
4
If accessible, check for a voltage sense fuse in the circuit. Some vehicles use small fuses (1-5A) to protect sense wiring from short circuits. Replace if blown, but investigate why it blew.
5
Measure voltage directly at the sense wire tap point on the battery pack and at the module connector pin. Compare readings to identify where the signal is lost in the circuit.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The battery management system has detected a general circuit fault with the secondary ("B") hybrid battery pack voltage sensing circuit. This circuit measures the total pack voltage or a section of the pack as a secondary/redundant measurement. A circuit fault means the voltage reading is absent, fi...
The most common cause of P0B14 (Hybrid Battery Pack Voltage Sense "B" Circuit) is: Faulty voltage sense circuit or measurement IC in the battery management module
Typical repair costs for P0B14 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Accurate battery voltage measurement is essential for safe operation — it prevents overcharging and deep discharging that can lead to cell damage or thermal events. Loss of the redundant voltage sense circuit reduces safety monitoring capability. The vehicle may limit power or disable hybrid operation. All work requires high-voltage safety training and proper PPE.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B14 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Battery Management
Difficulty
Type
Generic (SAE)
Recommended Tools
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