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Service bulletin TIB-26-21

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 id10042747
Published by NHTSA2012-01-09
Manufacturer's numberTIB-26-21
Manufacturer's date2011-09-12
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION

NHTSA's summary

KENWORTH: ON CERTAIN TRUCKS, THE EATON TRANSMISSIONS MAY BE SUSCEPTIBLE TO HAVING WATER INTRUSION WHICH CAN CAUSE THE ECU TO STOP WORKING. LOSS OF COMMUNICATION AND PRIMARY FUNCTION MAY REQUIRE REPLACEMENT OF THE ECU'S FAILURE MODE. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Automatic transmission

Vehicles listed
KENWORTH T3002011
KENWORTH T4402011 to 2012
KENWORTH T4702011 to 2012
KENWORTH T6602011 to 2012
KENWORTH T7002011 to 2012
KENWORTH T8002011 to 2012
KENWORTH W9002011 to 2012

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