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Service bulletin K53821422

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 id10134785
Published by NHTSA2018-04-23
Manufacturer's numberK53821422
Manufacturer's date2018-03-16
NHTSA componentPOWER TRAIN:MANUAL TRANSMISSION

NHTSA's summary

Mack Chassis - Equipped With An Automated Manual Transmission Model F ( AMT-F, mDrive ) - Road Speed Parameter Discrepancies ( P1ALV ) Following Software Update; Road Speed Limit Incorrect - OBD16 And Newer Chassis

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, Manual transmission

Vehicles listed
MACK CHU
MACK CXU
MACK GU

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