P1A90 on Kia

On Hyundai and Kia electric cars, a fault in the integrated charging control unit (ICCU), which supplies power to the 12-volt system

Severity: Stop — don't drive this car

Owners of the Ioniq 5 and EV6 describe a pull-over or "stop vehicle" message, a speed-limited "turtle" mode and a dead car after this code, and the 12-volt system can fail, so treat it as do not drive.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

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This page covers only what differs on Kia. For what P1A90 means, the ranked causes and the test order, see the P1A90 guide.

What's different on Kia

Kia

2022–2023 · EV6
Supported by vehicle data
Two EV6 owners told NHTSA about P1A90 with an ICCU failure after recall software updates; the dealer confirmed an ICCU failure. Complaints, not a bulletin.

Sources and review

NHTSA complaint ODI 11653352 — NHTSA Office of Defects Investigation
NHTSA complaint ODI 11697780 — NHTSA Office of Defects Investigation
NHTSA complaint ODI 11509852 — NHTSA Office of Defects Investigation

Last reviewed: October 15, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

Severity: Stop — don't drive this car

What's different on Kia

KiaYour car

Sources and review

Kia