What Does P0B6F Mean?
DTC P0B6F indicates that the hybrid battery voltage sense circuit for cell group "K" is reading below the minimum expected threshold. The BMS has detected a consistently low voltage signal from this cell group, which may indicate underperforming cells, an excessive parasitic drain on the group, or a circuit fault pulling the sense line low. This is a more specific fault than a general circuit code and narrows diagnosis to low-voltage conditions.
Common Causes
30%
One or more degraded/failing cells in group K with reduced voltage output
25%
High-resistance or partial open in the voltage sense circuit causing voltage drop
20%
Short to ground in the cell group K sense wiring
15%
Cell group K self-discharge rate significantly higher than normal
10%
BMS sensing channel input impedance degradation
Diagnostic Steps
1
Record freeze frame data and note cell group K voltage relative to other groups. A significantly lower reading confirms the fault condition.
2
Measure cell group K voltage directly at the battery terminals with a DVOM. If voltage matches the BMS reading, the cells themselves are the issue.
3
If direct measurement is normal but BMS reads low, check for high-resistance connections or voltage drops across connectors in the sense circuit.
4
Inspect wiring for shorts to ground, especially where the harness passes near metal brackets or mounting hardware.
5
Perform a load test or capacity test on the cell group K to evaluate individual cell health and identify weak cells.
6
If a single weak cell is identified, consult manufacturer service information for cell module replacement procedures.
Estimated Repair Cost
$200 - $3,500
Parts + labor, varies by vehicle and location
DTC P0B6F indicates that the hybrid battery voltage sense circuit for cell group "K" is reading below the minimum expected threshold. The BMS has detected a consistently low voltage signal from this cell group, which may indicate underperforming cells, an excessive parasitic drain on the group, or a...
The most common cause of P0B6F (Hybrid Battery Voltage Sense "K" Circuit Low) is: One or more degraded/failing cells in group K with reduced voltage output
Typical repair costs for P0B6F range from $200 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low cell group voltage can indicate cells approaching deep discharge, which can cause permanent capacity loss or cell reversal. The BMS may restrict regenerative braking and hybrid assist to prevent further discharge. Continued operation risks accelerated degradation of the affected cells.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B6F 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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