What Does P0B19 Mean?
DTC P0B19 is a general circuit fault code for the hybrid battery pack voltage sense "C" circuit. The BMS has detected an electrical malfunction in the sense line monitoring the "C" section of the high-voltage battery pack. This generic circuit code means the system has identified a problem but cannot further classify it as high, low, or intermittent, often indicating an open circuit or a complete loss of signal.
Safety Warning
Complete loss of voltage sensing for a battery pack section means the BMS cannot monitor for overvoltage, undervoltage, or cell imbalance in that area. This is a significant safety concern as dangerous conditions could develop undetected.
Common Causes
30%
Open circuit in the voltage sense "C" wiring harness
25%
Disconnected or damaged connector at the "C" section voltage tap
20%
Failed voltage sense module or tap for the "C" pack section
15%
BMS input channel fault for the "C" sense circuit
10%
Blown fuse or safety interlock affecting the "C" sense line
Diagnostic Steps
1
Retrieve freeze frame data and check if the "C" section voltage reads zero, maximum, or an implausible value.
2
Verify continuity of the voltage sense "C" circuit wiring from the pack tap point to the BMS connector using a multimeter.
3
Inspect the "C" section connector for physical damage, unseated pins, or signs of heat damage.
4
Check for any related fuses or safety interlocks in the sense circuit path that may be open.
5
If wiring is intact, measure the actual pack "C" section voltage at the terminals with proper PPE and compare to expected values.
6
Test or replace the voltage sense module if all wiring and connections test good.
Estimated Repair Cost
$250 - $3,500
Parts + labor, varies by vehicle and location
DTC P0B19 is a general circuit fault code for the hybrid battery pack voltage sense "C" circuit. The BMS has detected an electrical malfunction in the sense line monitoring the "C" section of the high-voltage battery pack. This generic circuit code means the system has identified a problem but canno...
The most common cause of P0B19 (Hybrid Battery Pack Voltage Sense "C" Circuit) is: Open circuit in the voltage sense "C" wiring harness
Typical repair costs for P0B19 range from $250 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Complete loss of voltage sensing for a battery pack section means the BMS cannot monitor for overvoltage, undervoltage, or cell imbalance in that area. This is a significant safety concern as dangerous conditions could develop undetected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B19 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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