P0B40
Hybrid/EV Battery Voltage Sense B Circuit
P0B40 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Voltage Sense B Circuit. Common causes: section b voltage sensor fault, open or short circuit in the sensor circuit. Estimated repair cost: $56–278.
Symptoms
- Check engine light comes on
- Hybrid system power reduction
- Reducing the range of an electric vehicle
- Possible problems with battery charging
- Error message on display
Causes
- Section B voltage sensor fault
- Open or short circuit in the sensor circuit
- Poor contact in sensor connectors
- Problems with the Battery Management Module (BMS)
- Internal faults in the battery module
How to Fix
- Diagnostics of a high-voltage system using specialized equipment
- Checking the continuity of the voltage sensor circuit
- Testing voltage sensor readings
- Checking connections and connectors in the circuit
- Repair only from an authorized dealer
Related codes
Error P0B40 by Vehicle Brand
FAQ
What does the P0B40 code mean?
P0B40 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Voltage Sense B Circuit
What causes a P0B40 error code?
The most common causes of P0B40 include: Section B voltage sensor fault; Open or short circuit in the sensor circuit; Poor contact in sensor connectors; Problems with the Battery Management Module (BMS).
How do I fix a P0B40 diagnostic trouble code?
To fix P0B40: Diagnostics of a high-voltage system using specialized equipment. Checking the continuity of the voltage sensor circuit. Testing voltage sensor readings. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0B40?
Limited driving only, diagnose soon
How much does it cost to fix P0B40?
The estimated repair cost for P0B40 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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