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Service bulletin SIB-4-11-14

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 id10055688
Published by NHTSA2014-07-03
Manufacturer's numberSIB-4-11-14
Manufacturer's date2014-04-01
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

DETROIT: DATA IS ERRATIC; THE CLUTCH POSITION SENSOR, DUE TO TRANSMISSION CONTROL MODULE (TCM) HAVING FAULTS SPN 520971/7, 521491/2 SET. *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, Transmission control module

Vehicles listed
DETROIT DIESEL DETROIT

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