The most common causes of P1AAE include: Battery management system (BMS) malfunction; High voltage battery cell imbalance; Battery temperature sensor fault; High voltage contactor failure. A professional OBD-II scan tool is recommended for accurate diagnosis.

How do I fix P1AAE for Hyundai IONIQ 5?

Recommended steps to address P1AAE: (1) Stop driving immediately and park in a safe location (2) Do not attempt to restart the vehicle (3) Contact roadside assistance or authorized dealer (4) Have the vehicle towed to an authorized service center. Always consult a qualified EV technician for high-voltage system repairs.

Is it safe to drive with P1AAE?

No. P1AAE is a critical fault code indicating an immediate safety risk. Stop driving as soon as safely possible and contact roadside assistance or an authorized service center.

Hyundai IONIQ 5

P1AAE

Critical

High Voltage Battery Isolation Fault

Severity

Critical

What does P1AAE mean?

Fault code P1AAE means "High Voltage Battery Isolation Fault". This is a Hyundai-specific EV diagnostic trouble code for the Hyundai E-GMP platform. It is classified as "battery" with a severity level of "critical". Applicable models: IONIQ 5, IONIQ 6, Kia EV6, GV60, EV9.

Possible Causes

Battery management system (BMS) malfunction
High voltage battery cell imbalance
Battery temperature sensor fault
High voltage contactor failure

Recommended Actions

1 Stop driving immediately and park in a safe location
2 Do not attempt to restart the vehicle
3 Contact roadside assistance or authorized dealer
4 Have the vehicle towed to an authorized service center

This is a critical fault code. Pull over safely and seek immediate professional assistance.

This code applies to all vehicles. View generic P1AAE information →