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Service bulletin ST 1898 Rev B

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 id10156667
Published by NHTSA2019-04-08
Manufacturer's numberST 1898 Rev B
Manufacturer's date2014-04-11
NHTSA componentPOWER TRAIN

NHTSA's summary

Service Tip regarding Water and/or Ethylene Glycol in Transmission Fluid. The analysis of the fluid sample (by the fluid supplier or any qualified laboratory) will provide the degree of contamination and possible clue of its source

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

Transmission and driveline

Vehicles listed
ALLISON TRANSMISSION

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