P0AA1

Hybrid/EV Battery Positive Contactor Circuit Stuck Closed

Severity

🚨 Critical

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–222 (est.)

Symptoms

Hybrid/electric system does not turn off when ignition is turned off
Check engine light comes on
An error message appears on the dashboard
Reduced performance of the hybrid system
The vehicle may not switch to ready mode

Causes

Battery positive contactor fault
Problems in the contactor control circuit
Battery management module (BMS) malfunction
Short circuit in the contactor circuit
Mechanical contactor jamming

How to Fix

Check the condition of the contactor visually
Test contactor control circuit
Check the power and ground of the contactor
Scan the battery control module for additional trouble codes
Replace faulty contactor if necessary

Related codes

P0AA2 P0AA3 P0AA4