# Service bulletin Circ 91FN\_REV1

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: 10249584
- Published by NHTSA: 2024\-02\-06
- Manufacturer's number: Circ 91FN\_REV1
- Manufacturer's date: 2024\-01\-30
- NHTSA component: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

Affected vehicles will receive the latest software version via a software update. This software contains an optimized self\-diagnosis function for the high\-voltage battery. In addition to the software update, the high\-voltage battery cells may experience an increased self\-discharge. The high\-voltage battery will be evaluated, and any affected high\-voltage cell modules will be replaced.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-10249584-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-10249584-9999.pdf)

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

## Components

Electrical system, Software

## Vehicles listed

- 2022 to 2023 AUDI Q4 E\-TRON
- 2022 to 2023 AUDI Q4 E\-TRON SPORTBACK

JSON: [/v1/bulletins/10249584](/v1/bulletins/10249584)

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