P0B29

Hybrid/EV Battery B Voltage Low

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$278–1667 (est.)

Symptoms

Reduced motor power
Reduced electric range
Warning messages on the dashboard
Problems with charging a high-voltage battery
Switching to petrol engine more often than usual

Causes

Degradation of high-voltage battery cells
Malfunction of the element balancing system
Problems with the Battery Management System (BMS)
Damage to wiring harnesses or connectors
Short circuit in battery cells

How to Fix

Diagnosis of battery cell condition
Checking the operation of the balancing system
Battery Management System (BMS) Testing
Inspection of high voltage system circuits and connectors
Replacing faulty battery cells or the entire module
Repair only from an authorized dealer

Related codes

P0B28 P0B2A P0A80