What Does P0B50 Mean?
DTC P0B50 indicates the hybrid battery voltage sense "E" circuit is operating outside its expected performance range at the individual module level. The BMS has detected that the "E" module voltage readings, while present, deviate from expected values given the current SOC, temperature, and load conditions. This range/performance fault typically suggests cell degradation, capacity mismatch, or sensor drift within the "E" module monitoring path.
Common Causes
30%
Degraded or aging cells in the "E" battery module
25%
Cell monitoring IC drift or calibration inaccuracy
20%
High-resistance connection at the "E" module voltage tap
15%
Temperature differential affecting the "E" module relative to other modules
10%
Cell supervision board calibration or reference data error for the "E" channel
Diagnostic Steps
1
Compare the "E" module voltage against adjacent modules at identical SOC and temperature using scan tool live data.
2
Perform a cell capacity or balance test on the "E" module to assess degradation.
3
Measure actual "E" 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 for signs of corrosion or looseness.
5
Review battery thermal management data for temperature imbalances affecting the "E" module's voltage behavior.
Estimated Repair Cost
$250 - $3,500
Parts + labor, varies by vehicle and location
DTC P0B50 indicates the hybrid battery voltage sense "E" circuit is operating outside its expected performance range at the individual module level. The BMS has detected that the "E" module voltage readings, while present, deviate from expected values given the current SOC, temperature, and load con...
The most common cause of P0B50 (Hybrid Battery Voltage Sense "E" Circuit Range/Performance) is: Degraded or aging cells in the "E" battery module
Typical repair costs for P0B50 range from $250 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Performance deviations at the module level are often an early indicator of cell degradation. While not immediately hazardous, unaddressed degradation can progress to more severe conditions and contribute to overall pack imbalance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B50 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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