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Service bulletin KC-646

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 id10213626
Published by NHTSA2022-06-07
Manufacturer's numberKC-646
Manufacturer's date2022-05-17
NHTSA componentPOWER TRAIN

NHTSA's summary

Mack Chassis - Equipped With An Automated Manual Transmission (AMT-D, mDrive) - Unable To Program Transmission Electronic Control Unit (TECU) That Comes With A Reman Transmission; Information For Programming TECUs For Different Emissions Levels - FSB

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

Vehicles listed
MACK CHU
MACK CHU2006 to 2018
MACK CHU6122008
MACK CHU6132008
MACK CHU6132010
MACK CHU6142010
MACK CXU
MACK CXU2006 to 2018
MACK CXU6122008
MACK CXU6122010 to 2011
MACK CXU6132008
MACK CXU6132010
MACK CXU613E2010
MACK CXU6142010

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