# P1AD3 on the 2027 Hyundai IONIQ 5

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P1AD3

- [11038467](https://open.wenmarpro.com/bulletins/11038467), 2026-10-14: Certain IONIQ 5 \(NEA EV\) vehicles may experience Malfunction Indicator Lamp \(MIL\) illumination and false battery overtemperature fault diagnosis caused by water ingress into the high voltage battery system. This condition may cause unnecessary fail\-safe activation, potentially resulting in reduced vehicle performance or limited vehicle operation if the vehicle is continually driven. This bulletin provides the service procedure to update the Battery Management System \(BMS\) software to optimize the fail\-safe activation logic to prevent false activation. Additionally, diagnostic criteria for DTC P1AD300 “Hybrid/EV Battery Abnormal Performance: MISD” has also been improved to enhance diagnostic accuracy.