P0BA3

Hybrid/EV Battery Voltage Sense U Circuit Intermittent/Erratic

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced performance of the hybrid system
Incorrect battery level display
Intermittent malfunctions of the hybrid system
Reduced electric range

Causes

Damage to the wiring in the voltage measurement circuit
Oxidized or corroded connector pins
Battery voltage sensor fault
Problems with the Battery Management Module (BMS)
Poor grounding in the measurement circuit

How to Fix

Check the integrity of the wiring and connectors in the measurement circuit
Clean connector contacts from oxidation
Check the functionality of the voltage sensors
Test the Battery Management Module (BMS)
Check the quality of grounding in the circuit

Related codes

P0BA1 P0BA2 P0BA4