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Service bulletin TSB200049-030220

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 id10173941
Published by NHTSA2020-04-20
Manufacturer's numberTSB200049-030220
Manufacturer's date2020-03-02
NHTSA componentEQUIPMENT

NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of Active Fault Code 3749 with associated derate Fault Code 3714 due to the diagnostic is not robustly tuned for PTO mode operation, leading to incorrect efficiency estimation.

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

Equipment and accessories

Vehicles listed
CUMMINS X12

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