P0B85

Hybrid/EV Battery Voltage Sense O Circuit Intermittent/Erratic

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable operation of the hybrid system
Reduced vehicle power
Check Engine Light Illuminated
Switching to emergency mode
Inaccurate battery level readings

Causes

Poor contact in the voltage measurement circuit connectors
Wiring harness damage
Battery voltage sensor fault
Problems with the Battery Management Module (BMS)
Contact corrosion

How to Fix

Check the integrity of the wiring harness and connectors
Clean contacts from corrosion
Check the operation of the voltage sensor
Test the Battery Management Module (BMS)
Replace damaged components

Related codes

P0B84 P0B86 P0A80