What Does P0B16 Mean?
DTC P0B16 indicates the hybrid battery pack voltage sense "B" circuit is reading below the expected threshold. The battery management system (BMS) has detected that the voltage signal from the "B" sense line of the high-voltage battery pack is abnormally low, which may indicate a failing cell group, wiring fault, or sensor issue. This code is specific to pack-level voltage monitoring, which aggregates multiple cell modules into a section for overall pack health assessment.
Safety Warning
Inaccurate pack voltage monitoring can lead to overcharging or deep discharging of cell groups, creating risk of thermal runaway, fire, or sudden loss of hybrid propulsion. The vehicle may enter a reduced power mode or become undriveable.
Common Causes
30%
Degraded or failed hybrid battery cells in the "B" section
25%
Corroded or damaged wiring/connectors in the voltage sense "B" circuit
20%
Faulty voltage sense tap or sensor on the "B" pack section
15%
Battery management system (BMS) module malfunction
10%
Poor ground connection for the voltage sense circuit
Diagnostic Steps
1
Retrieve freeze frame data and note SOC, temperature, and operating conditions at the time of the fault.
2
Using a high-voltage rated multimeter with proper PPE, measure the actual voltage at the "B" pack section terminals and compare to the BMS reported value.
3
Inspect the voltage sense "B" circuit wiring harness and connectors for corrosion, chafing, or damage, paying special attention to the high-voltage interlock loop area.
4
Check for voltage imbalance across all pack sections using the scan tool's hybrid battery data stream; compare "B" section to other sections.
5
If wiring is intact, substitute or test the voltage sense tap/sensor and recheck readings.
6
If cells are degraded, perform a battery capacity test to determine if cell module replacement or full pack replacement is necessary.
Estimated Repair Cost
$300 - $4,500
Parts + labor, varies by vehicle and location
DTC P0B16 indicates the hybrid battery pack voltage sense "B" circuit is reading below the expected threshold. The battery management system (BMS) has detected that the voltage signal from the "B" sense line of the high-voltage battery pack is abnormally low, which may indicate a failing cell group,...
The most common cause of P0B16 (Hybrid Battery Pack Voltage Sense "B" Circuit Low) is: Degraded or failed hybrid battery cells in the "B" section
Typical repair costs for P0B16 range from $300 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Inaccurate pack voltage monitoring can lead to overcharging or deep discharging of cell groups, creating risk of thermal runaway, fire, or sudden loss of hybrid propulsion. The vehicle may enter a reduced power mode or become undriveable.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B16 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Battery System
Difficulty
Type
Generic (SAE)
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