P0B44

Hybrid/EV Battery Voltage Sense B Circuit Intermittent/Erratic

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Reduced performance of the hybrid system
The car may go into emergency mode
Unstable battery voltage reading on dashboard
Reduced power or strange transmission behavior

Causes

Damaged or corroded voltage sensing circuit connectors
Open or short circuit in wiring harness
Battery voltage sensor fault B
Problems with the battery management module
Internal problems of the high-voltage battery

How to Fix

Check the condition of the connectors and wiring in the measurement circuit
Test Battery Voltage Sensor B
Check the integrity of the wiring harness
Scan the battery management module for errors
Check the condition of the high-voltage battery
Repair only from an authorized dealer

Related codes

P0B45 P0B46 P0B47