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Service bulletin 284-056-01

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 id10057999
Published by NHTSA2015-07-23
Manufacturer's number284-056-01
Manufacturer's date2015-04-01
NHTSA componentENGINE

NHTSA's summary

MACK TRUCKS 2015 MODEL YEARS: BULLETIN INFORMATION REGARDING NEW ENGINE HARNESS CHANGES MP7, MP8,US2014 CHU, CXU, GU, LEU, MRU. THE RETAINING CLAMPS HAVE CHANGED FROM METAL TO PLASTIC WITH METAL INSERTS THAT ARE INTEGRATED INTO THE HARNESS. *LJ

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

Engine

Vehicles listed
MACK CHU2014 to 2015
MACK GRANITE (GU)2014 to 2015
MACK LEU2014 to 2015
MACK PINNACLE (CXU)2014 to 2015

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