P0B4B

Hybrid/EV Battery Voltage Sense D Circuit Range/Performance

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
Problems with charging a high-voltage battery
Incorrect battery level display
The vehicle goes into emergency mode

Causes

Open or short circuit in the sensor circuit
Poor contact in the measuring circuit connectors
Voltage sensor fault
Problems with the Battery Management Module (BMS)
Contact corrosion in a high voltage system

How to Fix

Check the continuity of the wiring of voltage sensor circuit D
Inspect and clean the contacts in the measuring circuit connectors
Check the functionality of the voltage sensor
Scan the battery management module for errors
If necessary, replace faulty sensor or circuit components

Related codes

P0B4A P0B4C P0B4D