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Service bulletin FSB 221-010

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 id10083820
Published by NHTSA2016-11-02
Manufacturer's numberFSB 221-010
Manufacturer's date2013-09-20
NHTSA componentENGINE

NHTSA's summary

DURING LONG HARD PULL CONDITIONS, DIAGNOSTIC TROUBLE CODES (DTC) SPN 100 FMI 1 OR P052400 CAN LOG ON CERTAIN MACK CXU, GU, LEU AND MRU VEHICLES BUILT BETWEEN JANUARY 1, 2010 AND CURRENT PRODUCTION WITH MP7 EPA2010 AND OBD2013 ENGINES.

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

Trouble codes named

P0524

Vehicles listed
MACK CXU2011 to 2014
MACK GU2011 to 2014
MACK LEU2011 to 2014
MACK MRU2011 to 2014

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