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Service bulletin 2621

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 id614494
Published by NHTSA2000-10-24
Manufacturer's number2621
Manufacturer's date2000-08-01
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

GENERAL INFORMATION PERTAINING TO ALLISON TRANSMISSION SENSOR WIRING. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Automatic transmission, Transmission control module

Vehicles listed
FREIGHTLINER BUSINESS CLASS

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