What Does P0B46 Mean?
DTC P0B46 indicates the hybrid battery voltage sense "C" circuit is not performing within its expected range at the individual module level. The BMS has detected that the "C" module voltage readings are present but deviate from expected values based on SOC, temperature, and operating conditions. This range/performance code typically suggests cell aging, capacity loss, or minor sensor drift.
Common Causes
30%
Degraded or aging cells in the "C" battery module
25%
Cell monitoring IC drift or calibration loss
20%
High-resistance connection at the module voltage tap
15%
Temperature differential between the "C" module and other modules
10%
BMS cell supervision board calibration data error
Diagnostic Steps
1
Compare the "C" module voltage to adjacent modules at the same SOC and temperature conditions using scan tool data.
2
Perform a cell balance or capacity test on the "C" module to assess degradation level.
3
Measure the actual "C" module voltage at the cell terminals and compare to the BMS reported value to isolate sensor vs. cell issues.
4
Check the module voltage tap connection resistance and look for signs of corrosion or looseness.
5
Review the battery thermal management data to check for temperature imbalances affecting the "C" module's performance.
Estimated Repair Cost
$250 - $3,500
Parts + labor, varies by vehicle and location
DTC P0B46 indicates the hybrid battery voltage sense "C" circuit is not performing within its expected range at the individual module level. The BMS has detected that the "C" module voltage readings are present but deviate from expected values based on SOC, temperature, and operating conditions. Thi...
The most common cause of P0B46 (Hybrid Battery Voltage Sense "C" Circuit Range/Performance) is: Degraded or aging cells in the "C" battery module
Typical repair costs for P0B46 range from $250 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Module-level range/performance faults often indicate the early stages of cell degradation. While not immediately dangerous, they can progress to more severe faults and should be investigated to prevent pack-level imbalance issues.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B46 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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