P0BB3

Hybrid/EV Battery Voltage Sense Y Circuit

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–222 (est.)

Symptoms

Check Engine light comes on
Reduced vehicle power
Switching to emergency mode
Reduced hybrid system efficiency
Incorrect battery level readings

Causes

Open or short circuit in the sensor circuit
Voltage sensor fault Y
Poor contact in circuit connectors
Wiring harness damage
Battery management module malfunction

How to Fix

Check the continuity of the Y voltage sensor circuit
Check connections and connectors in the circuit
Test voltage sensor Y
Check the operation of the battery management module
Repair only from an authorized dealer

Related codes

P0BB1 P0BB2 P0BB4