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Service bulletin SIL 05-EP-20EN

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 id10175420
Published by NHTSA2020-05-26
Manufacturer's numberSIL 05-EP-20EN
Manufacturer's date2020-04-16
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

Instruction to service channel to familiarize themselves with safe electrical work practices when working on the high voltage electrical system of the H 40/50 EP transmission

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
ALLISON TRANSMISSION, INC B SERIES
ALLISON TRANSMISSION, INC B300 SERIES TRANSMISSION
ALLISON TRANSMISSION, INC B3400
ALLISON TRANSMISSION, INC B400 SERIES TRANSMISSION
ALLISON TRANSMISSION, INC H 40 EP TRANSMISSION
ALLISON TRANSMISSION, INC H 50 EP TRANSMISSION
ALLISON TRANSMISSION, INC T SERIES
ALLISON TRANSMISSION, INC T100 SERIES TRANSMISSION
ALLISON TRANSMISSION, INC T200 SERIES TRANSMISSION
ALLISON TRANSMISSION, INC T300 SERIES TRANSMISSION
ALLISON TRANSMISSION, INC T3280
ALLISON TRANSMISSION, INC T3325
ALLISON TRANSMISSION, INC T3375
ALLISON TRANSMISSION, INC T400 SERIES TRANSMISSION
ALLISON TRANSMISSION, INC TC10 SERIES TRANSMISSION

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