P0BB4

Hybrid/EV Battery Voltage Sense Y Circuit Range/Performance

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced vehicle power
Switching to emergency mode
Reduced range (for EV)
Incorrect battery level display

Causes

Voltage sensor fault Y
Damage to the measuring circuit wiring harness
Poor contact in connectors
Problems with the battery management module
Corrosion in electrical connections

How to Fix

Check the integrity of the Y-circuit wiring harness
Test battery voltage sensors
Check connections and contacts in connectors
Scan the battery management module for additional errors
If necessary, replace faulty components

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