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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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10202638
Published by NHTSA2021-11-05
Manufacturer's numberBulletin 24HM
Manufacturer's date2021-10-26
NHTSA componentUNKNOWN 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

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Engine control module

Vehicles listed
AUDI SQ72020
AUDI SQ82020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
A1324232060876_22024-03-06. Service bulletin. 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_32023-10-05. Service bulletin. This bulletin provides information for when DTC P0A7D00 is stored.
A1923412062951_32023-10-05. Service bulletin. 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_62023-02-07. Service bulletin. This bulletin provides instructions for when the MIL is on and DTC P044200 and/or P045600 is stored in the ECM.
A2722412058831_42022-04-05. Service bulletin. This bulletin contains a software update for DTC P0CA700 or U046900.
A2022402065287_22022-02-04. Service bulletin. This bulletin describes the repair procedure to address an internal defect in the EVAP leak detection pump causing false leak detection.
A2021392065287_12022-01-05. Service bulletin. There is an internal defect in the EVAP leak detection pump causing false leak detection.
Dealer 24HM2021-11-05. Service bulletin. 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_32021-07-02. Service bulletin. This bulletin states to create a PSS record if the driver assistance systems are sporadically not working.