P0B30

Hybrid/EV Battery D Voltage Unstable

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–556 (est.)

Symptoms

Reduced vehicle power
Reducing electric range
Check Engine Light Illuminates
Unstable operation of the hybrid system
Reduced efficiency of regenerative braking

Causes

Worn or damaged module D battery cells
Problems with balancing battery cells
Poor contacts in battery module connections
Damage to the Battery Management System (BMS)
Corrosion or oxidation of contacts

How to Fix

Diagnosis of high-voltage battery condition
Checking connections and contacts of module D
Battery Management System (BMS) Testing
Replacing damaged battery cells
Balancing Battery Module Cells

Related codes

P0B29 P0B31 P0A80