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Service bulletin TSB210032-040620

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 id10193403
Published by NHTSA2021-05-17
Manufacturer's numberTSB210032-040620
Manufacturer's date2021-04-06
NHTSA componentELECTRICAL SYSTEM:HAND HEATER:WIRING HARNESS; EQUIPMENT

NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of stuck intake air heater relay and intake air heater damage which may result in Fault Code 383, intake air heater malfunctions and trouble starting the engine. 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, Equipment and accessories

Vehicles listed
CUMMINS B6.7
CUMMINS ISB6.7

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