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Service bulletin Watch 501 REV B

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 id10202512
Published by NHTSA2021-10-25
Manufacturer's numberWatch 501 REV B
Manufacturer's date2016-01-11
NHTSA componentELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN

NHTSA's summary

Allison Transmission 5?? Generation Controls 2016 (B161, C161, and D161) Software Features and Enhancements.

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, Software

Vehicles listed
ALLISON 1000 SERIES TRANSMISSION
ALLISON 2000 SERIES TRANSMISSION
ALLISON 3000 SERIES TRANSMISSION
ALLISON 4000 SERIES TRANSMISSION
ALLISON TC10 SERIES TRANSMISSION

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