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Service bulletin Dealer34K1_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 id10245225
Published by NHTSA2023-12-06
Manufacturer's numberDealer34K1_REV1
Manufacturer's date2023-11-03
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM; POWER TRAIN

NHTSA's summary

"Transmission Control Module (TCM) Software - Updated repair steps after software update is completed. Added example photos of transmission damage. Added Canadian TSB number to reference if car returns with fault."

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

Electrical system, Transmission and driveline, Automatic transmission, Transmission control module

Vehicles listed
VOLKSWAGEN GOLF R2018

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
Circ34K1_REV12023-12-06. Service bulletin. "Transmission Control Module (TCM) Software - Updated repair steps after software update is completed. Added example photos of transmission damage. Added Canadian TSB number to reference if car returns with fault."
Dealer 34K12023-09-01. Service bulletin. Dealer Letter to announce Repair Available - Service Action 34K1 / TCM Software
Circular 34K12023-09-01. Service bulletin. Volkswagen 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.
V3718022033975112023-07-10. Service bulletin. Automatic Transmission Fluid Requirements
Dealer34J734L92022-02-04. Service bulletin. Replace the gear shift cover chrome trim frame.
Circ_34J734L92022-02-04. Service bulletin. Replace the gear shift cover chrome trim frame.
TT 34 21 012021-07-02. Service bulletin. Reverse gear function note.
18VWUSMN1126192019-12-06. Service bulletin. "Additional Maintenance Items section: ""Transmission, Automatic (non-DSG): Change fluid and filter every 80K miles"" REMOVED: ""and filter"""