P0A27

Hybrid/EV Battery Power Off Circuit

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Hybrid system does not activate
High voltage system fault warning
The car only runs on internal combustion engines
Reduced vehicle power
Check engine light is flashing

Causes

Faulty high voltage battery relay
Open or short circuit in control circuit
Problems with the Battery Management Unit (BMS)
Blown high voltage system fuse
Contact corrosion in high voltage connectors

How to Fix

Check the condition of high-voltage fuses
Diagnose battery disconnect relay
Check the integrity of wiring and connectors
Scan Battery Management Module (BMS)
Repair only from an authorized dealer

Related codes

P0A23 P0A80 P0A7F