# Service bulletin 23\-01\-072H

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10243318
- Published by NHTSA: 2023\-10\-02
- Manufacturer's number: 23\-01\-072H
- Manufacturer's date: 2023\-09\-07
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

This bulletin provides the procedure to update the Hybrid Control Unit \(HCU\) / Low DC/DC Converter \(LDC\) software logic to eliminate internal P\-DTCs \(that are not viewable\) in certain 2019\-2021MY IONIQ Hybrid \(AE HEV\) and 2021MY IONIQ Plug\-in Hybrid \(AE PHEV\) vehicles.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10243318-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10243318-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Transmission and driveline, Software

## Vehicles listed

- 2019 to 2021 HYUNDAI IONIQ HYBRID

## Recalls for the same vehicles and component

- [21V944000](/recalls/nhtsa/21V944000.md), 2021-12-07: ELECTRICAL SYSTEM:PROPULSION SYSTEM:CHARGING:MODULE:ONBOARD \(OBCM\); ELECTRICAL SYSTEM:SOFTWARE

JSON: [/v1/bulletins/10243318](/v1/bulletins/10243318)

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