P0A28

Hybrid/EV Battery Power Off Circuit Low

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Hybrid system does not activate
Check engine light comes on
Reduced power or transition to emergency mode
Inability to start the car
Error message on display

Causes

Faulty battery cut-off relay
Open or short circuit in control circuit
Problems with high voltage fuse
Battery management module malfunction
Contact corrosion in a high voltage system

How to Fix

Check the condition of high-voltage fuses
Diagnose the control circuit for breaks and short circuits
Check the functionality of the battery disconnect relay
Scan the battery management module for errors
Repair only from an authorized dealer

Related codes

P0A29 P0A80 P0A1F