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Service bulletin Circ34L4_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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10245540
Published by NHTSA2023-12-07
Manufacturer's numberCirc34L4_REV1
Manufacturer's date2023-11-03
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

Transmission Control Module (TCM) Software - Updated repair steps after software update is completed. Added example photos of transmission damage.

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, Automatic transmission, Transmission control module

Vehicles listed
AUDI A32017, 2018
AUDI S32018

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
Dealer 34L4 Rev22024-01-04. Service bulletin. Transmission Control Module (TCM) Software - Updated parts and claiming information
Circular34L4Rev22024-01-04. Service bulletin. Transmission Control Module (TCM) Software - Updated parts and claiming information
Dealer34L4_REV12023-12-07. Service bulletin. Transmission Control Module (TCM) Software - Updated repair steps after software update is completed. Added example photos of transmission damage.
A3523442070217_12023-10-05. Service bulletin. This bulletin provides information for when the Gearbox warning comes on, and various DTC memory entries are stored in the TCM.
Dealer 34L42023-09-01. Service bulletin. Dealer Letter to announce Repair Available - Service Action 34L4 / TCM Software
Circular 34L42023-09-01. Service bulletin. Audi is providing updated transmission control module (TCM) software to enhance an in-vehicle alert should a problem arise within the auxiliary hydraulic pump. Additionally, if a specific fault is found after the software is updated, a repair will be made to the transmission.
A3523432050723_32023-09-01. Service bulletin. This bulletin provides information for when Gearbox Malfunction Warning, DTC P0C2900, P176F00, P176E00 or P175E00 stored in the TCM.
A3020292060560_12020-09-03. Service bulletin. This bulletin contains instructions for when the clutch is slipping, there is a gearbox malfunction message, and the vehicle shudders on odd number digits (several DTCs could be stored as well).
A3720002060146_12020-08-06. Service bulletin. This bulletin contains a software update that addresses a brief but sudden increase in engine speed without DTCs or leaks.
A351834 2049449-2018-12-10. Service bulletin. This bulletin contains repair instructions for DTC P060700.