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Service bulletin Circular37K8REV2

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 id10188612
Published by NHTSA2021-04-06
Manufacturer's numberCircular37K8REV2
Manufacturer's date2021-03-09
NHTSA componentPOWER TRAIN

NHTSA's summary

Transmission control module (TCM) software designed and certified for a similar model/model year was used in vehicles affected by this action. It is undetermined whether there could be an impact to emissions. Updated claiming and parts information to add optional part numbers

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

Transmission and driveline

Vehicles listed
AUDI A32015
AUDI RS52013
AUDI S42013
AUDI S52013
AUDI S5 CABRIOLET2013

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
TSB_2028902_52026-07-07. Service bulletin. This bulletin provides informaiton when the transmission warning message appears in the cluster; P074100 stored in the TCM.
TSB_2074808_42026-06-04. Service bulletin. The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy content (energy density) being reduced. This reduction in the energy content, which is due to factors. Revised header. Added Model years
TSB_2074808_32026-01-07. Service bulletin. This bulletin provides additoinal information to assist in determining the energy content of lithium-ion high-voltage batteries.
TSB_2028085_72025-04-04. Service bulletin. This bulletin provides information when there are leaks from the transmission.
A3724292076084_12025-01-07. Service bulletin. This TSB provides information when event memory entries cannot be deleted (Mode$0A error) on gearboxes: DL501, DL382/DL382E and DQ500.
A0124442075010_22024-12-04. Service bulletin. This bulletin provides information when the engine warning lamp lights up in the instrument cluster, and the vehicle has reduced power. DTCs P256300, P056E00, P00AF00.
A0124392075010_12024-10-28. Service bulletin. This bulletin provides information when the engine warning lamp lights up in the instrument cluster, and the vehicle has reduced power. DTCs P256300, P056E00, P00AF00.
A3724222074826_12024-09-06. Service bulletin. This bulletin offers information about the basic information needed for technical requests for gaerbox complaints.
A3724222074826_12024-09-06. Service bulletin. This bulletin offers information about the basic information needed for technical requests for gaerbox complaints.
A4824682028220_112024-08-06. Service bulletin. This bulletin provides information when there is visual damage on the steering wheel.