P0B27

Hybrid/EV Battery B Voltage

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–889 (est.)

Symptoms

Hybrid system power reduction
Increased fuel consumption (for hybrids)
Reduced range (for electric vehicles)
Check Engine Light Illuminated
Error message on display

Causes

Battery module B fault
Poor contact in high voltage battery connectors
Damage to battery wiring harness
Battery management system (BMS) malfunction
Voltage imbalance between battery cells

How to Fix

High Voltage Battery System Diagnostics
Checking battery connections and connectors
Testing individual battery modules
Replacing a faulty battery module
Battery Management System (BMS) Calibration

Related codes

P0B28 P0B29 P0B2A