# Service bulletin Bulletin 24HM

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: 10202638
- Published by NHTSA: 2021\-11\-05
- Manufacturer's number: Bulletin 24HM
- Manufacturer's date: 2021\-10\-26
- NHTSA component: UNKNOWN OR OTHER; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE

## NHTSA's summary

Affected Engine Control Software does not disable the warm\-up correction factor following engine start and warm\-up as described in Auxiliary Emission Control Device \(AECD\) documentation.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202638-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202638-9999.pdf)

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

## Components

Engine, Engine control module

## Vehicles listed

- 2020 AUDI SQ7
- 2020 AUDI SQ8

## Other bulletins for the same vehicles and component

- [A1324232060876\_2](/bulletins/10250292.md), 2024-03-06, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This bulletin provides information for when the MIL is illuminated; DTC P030000 is stored in the ECM, and corrosion marks are on the cylinder walls.
- [A2723602067906\_3](/bulletins/10242930.md), 2023-10-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This bulletin provides information for when DTC P0A7D00 is stored.
- [A1923412062951\_3](/bulletins/10242911.md), 2023-10-05, Service bulletin: ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This bulletin provides information for when the red coolant warning lamp is on and the DTCs P218100, P017B00, P017C00, and/or P017E00 are stored in the ECM.
- [A2023522065287\_6](/bulletins/10230589.md), 2023-02-07, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This bulletin provides instructions for when the MIL is on and DTC P044200 and/or P045600 is stored in the ECM.
- [A2722412058831\_4](/bulletins/10208897.md), 2022-04-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This bulletin contains a software update for DTC P0CA700 or U046900.
- [A2022402065287\_2](/bulletins/10206879.md), 2022-02-04, Service bulletin: FUEL SYSTEM, GASOLINE:STORAGE:EVAPORATIVE EMISSIONS:HOSES/VALVES/SENSORS; UNKNOWN OR OTHER; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This bulletin describes the repair procedure to address an internal defect in the EVAP leak detection pump causing false leak detection.
- [A2021392065287\_1](/bulletins/10205901.md), 2022-01-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). There is an internal defect in the EVAP leak detection pump causing false leak detection.
- [Dealer 24HM](/bulletins/10202639.md), 2021-11-05, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. Affected Engine Control Software does not disable the warm\-up correction factor following engine start and warm\-up as described in Auxiliary Emission Control Device \(AECD\) documentation.
- [A9021062061489\_3](/bulletins/10198251.md), 2021-07-02, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This bulletin states to create a PSS record if the driver assistance systems are sporadically not working.

JSON: [/v1/bulletins/10202638](/v1/bulletins/10202638)

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