P0BA9

Hybrid/EV Battery Voltage Sense W Circuit

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced power or performance
The vehicle goes into emergency mode
Unstable operation of the hybrid system
Errors in the battery charging system

Causes

Open or short circuit in the voltage measurement circuit
Battery voltage sensor fault
Damage to connectors or corrosion of contacts
Problems with the Battery Management Module (BMS)
Wiring harness damage

How to Fix

Check the integrity of the voltage measurement circuit
Inspect and clean connector contacts
Check the functionality of the voltage sensor
Test the battery management module
Repair only from an authorized dealer

Related codes

P0BA6 P0BA7 P0BA8