WenmarOpen by Wenmar Pro

Service bulletin P-1662

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 id10027205
Published by NHTSA2009-01-10
Manufacturer's numberP-1662
Manufacturer's date2009-06-30
NHTSA componentENGINE AND ENGINE COOLING:ENGINE:DIESEL

NHTSA's summary

MACK TRUCK: MODELS CXU, CHU, GU, MRU AND LEU CHASSIS. US07 MP7 ENGINE MANAGEMENT SYSTEM (EMS) SOFTWARE UPGRADE. THE REVISION INCLUDES A REDUCTION I N PEAK INJECTION PRESSURES TO IMPROVE LONGEVITY OF UNIT INJECTOR COMPONENTS. *PE UPDATED 9/28/09. *PE UPDATED 2/12/10. *PE

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 CHU2006 to 2008
MACK CXU2006 to 2008
MACK GU2006 to 2008
MACK LEU2007 to 2008
MACK MRU2007 to 2008

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