P0B40

Hybrid/EV Battery Voltage Sense B Circuit

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

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

P0B41 P0B42 P0B39