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Service bulletin 121023

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 id10000115
Published by NHTSA2003-02-13
Manufacturer's number121023
Manufacturer's date2005-08-19
Replaces121023
NHTSA componentSTRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS

NHTSA's summary

REAR CROSSMEMBER REINFORCEMENT. MACK CX, CH AND CL WITH CH/CX STYLE REAR CROSSMEMBERS. *TT *SC

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

Body and frame

Vehicles listed
MACK CH
MACK CL

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