What Does P0B47 Mean?
DTC P0B47 indicates the hybrid battery voltage sense "C" circuit is reading below the expected threshold at the individual module level. The BMS has detected that the "C" battery module is reporting abnormally low voltage, suggesting the cells within this module may be deeply discharged, degraded, or that the sense wiring has a fault causing a low reading. Module-level undervoltage must be addressed to prevent permanent cell damage.
Safety Warning
A module with low voltage can experience reversal during discharge, causing internal short circuits and potential thermal events. The weak module also drags down overall pack performance and can accelerate degradation of neighboring cells.
Common Causes
30%
Weak or failing cells within the "C" battery module
25%
Corroded or damaged voltage sense wiring causing low signal
20%
Short to ground in the "C" module voltage sense circuit
15%
Faulty cell monitoring IC reading low for the "C" channel
10%
Poor cell tab or busbar connection within the module
Diagnostic Steps
1
Retrieve freeze frame data and note SOC, temperature, and load conditions when the fault occurred.
2
Using the scan tool, compare the "C" module voltage to all other modules to identify the degree of deviation.
3
Measure actual cell voltage at the "C" module terminals with appropriate equipment and compare to the BMS reading.
4
Inspect the "C" module sense wiring for shorts to ground, corrosion, or damage.
5
If cells are confirmed low, perform individual cell testing within the module to locate the weakest cell.
6
Check internal module connections (cell tabs, busbars) for high-resistance joints that could cause voltage drop under load.
Estimated Repair Cost
$300 - $4,000
Parts + labor, varies by vehicle and location
DTC P0B47 indicates the hybrid battery voltage sense "C" circuit is reading below the expected threshold at the individual module level. The BMS has detected that the "C" battery module is reporting abnormally low voltage, suggesting the cells within this module may be deeply discharged, degraded, o...
The most common cause of P0B47 (Hybrid Battery Voltage Sense "C" Circuit Low) is: Weak or failing cells within the "C" battery module
Typical repair costs for P0B47 range from $300 to $4,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A module with low voltage can experience reversal during discharge, causing internal short circuits and potential thermal events. The weak module also drags down overall pack performance and can accelerate degradation of neighboring cells.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B47 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Battery System
Difficulty
Type
Generic (SAE)
Recommended Tools
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