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Service bulletin 25-1k2k-23

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 id10253360
Published by NHTSA2024-04-22
Manufacturer's number25-1k2k-23
Manufacturer's date2024-03-07
NHTSA componentPOWER TRAIN; ELECTRICAL SYSTEM

NHTSA's summary

Notice regarding compatibility of the 4th Generation A50 transmission control module (TCM) and the GM T14 TCM in 1000 and 2000 series transmissions

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

Vehicles listed
ALLISON 1000 SERIES TRANSMISSION
ALLISON 2000 SERIES TRANSMISSION

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