WenmarOpen by Wenmar Pro

Service bulletin TIB-26-022

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 id10046161
Published by NHTSA2012-09-29
Manufacturer's numberTIB-26-022
Manufacturer's date2012-08-24
NHTSA componentELECTRICAL SYSTEM:SOFTWARE; ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

KENWORTH: SOME TRUCKS HAVE MISMATCH OF ENGINE CALIBRATION SOFTWARE AND ALLISON HARDWARE RESULTING IN HYDRAULIC PRESSURE BEING IMPROPER FOR SHIFT CONTROL. MODELS 2010 T270S AND T370S. *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

Electrical system, Engine, Transmission and driveline, Automatic transmission, Software, Transmission control module

Vehicles listed
KENWORTH T2702010
KENWORTH T3702010

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