P0B28

Hybrid/EV Battery B Voltage Unstable

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–889 (est.)

Symptoms

Hybrid system power reduction
Unstable engine operation
Increased fuel consumption
Check Engine Light Illuminated
Reduced efficiency of regenerative braking

Causes

Poor contacts in battery B circuit
Damage to battery cells
Battery management system malfunction
Wiring Harness Problems
Battery wear

How to Fix

Check connections and contacts of battery B
Test the condition of the battery cells
Check the operation of the battery management system
Diagnose the condition of the wiring harness
If necessary, replace battery B

Related codes

P0B29 P0B27 P0B26