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Service bulletin ATC2278B

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 id10173912
Published by NHTSA2020-04-20
Manufacturer's numberATC2278B
Manufacturer's date2020-03-24
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

This is the cancellation of ATC2278. This Account Team Coverage field action authorizes certified repair locations to change the fuel heater wiring harness polarity by switching wiring terminal locations within the fuel heater connector, to install a new fuel heater, and to replace or install a new fuse in the fuel heater circuit on certain B6.7 CM2350 B121B units. This field action is a commercial (non-safety) action to properly re-enable the fuel heater functionality that was removed to correct a recall condition as described in the recall report for NHTSA recall 19E-020. This is an update to a previously submitted communication.

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

Electrical system

Vehicles listed
CUMMINS B6.7

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