What Does P0B43 Mean?
The battery management system has detected a high voltage condition on the hybrid battery voltage sense "B" circuit. The reading exceeds the maximum threshold, indicating possible overcharge, an open sense wire, or a short to voltage in the wiring.
Safety Warning
Do not drive or charge until verified. Genuine overcharge conditions present immediate thermal runaway and fire risk.
Common Causes
30%
Open circuit in the voltage sense B negative wire causing high reading
25%
Genuine overcharge condition in the monitored cell group
25%
Short to voltage source in the sense wiring
20%
BMS sense input channel reading high
Diagnostic Steps
1
Step 1: Verify actual cell group voltage with HV-rated DVOM immediately. If genuinely overcharged, engage service disconnect.
2
Step 2: If actual voltage is normal, check sense wire continuity for open circuits.
3
Step 3: Inspect wiring for contact with voltage sources.
4
Step 4: Check cell balancing data for this group via scan tool.
5
Step 5: Clean connectors and re-test. Replace BMS if sense channel is confirmed faulty.
Estimated Repair Cost
$150 - $3,000
Parts + labor, varies by vehicle and location
The battery management system has detected a high voltage condition on the hybrid battery voltage sense "B" circuit. The reading exceeds the maximum threshold, indicating possible overcharge, an open sense wire, or a short to voltage in the wiring.
The most common cause of P0B43 (Hybrid Battery Voltage Sense "B" Circuit High) is: Open circuit in the voltage sense B negative wire causing high reading
Typical repair costs for P0B43 range from $150 to $3,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Do not drive or charge until verified. Genuine overcharge conditions present immediate thermal runaway and fire risk.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B43 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Battery / High Voltage System
Difficulty
Type
Generic (SAE)
Recommended Tools
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