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Service bulletin 15TL21

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 id10126805
Published by NHTSA2018-01-05
Manufacturer's number15TL21
Manufacturer's date2015-09-18
NHTSA componentELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

15TL21 GHG17 Diagnostic Connector Update

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, Software

Vehicles listed
FREIGHTLINER 114SD2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
FREIGHTLINER 122SD2007 to 2018
FREIGHTLINER BUSINESS CLASS M22017
FREIGHTLINER CASCADIA2016
WESTERN STAR 47002002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
WESTERN STAR 49002002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
WESTERN STAR 57002002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
WESTERN STAR 69002002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018

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

Recalls for the same vehicles and component
17V0430002017-01-19. ELECTRICAL SYSTEM:SOFTWARE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
SF5332021-03-15. Service bulletin. SF533 Instrument Cluster Update
17TS-05REV22020-10-21. Service bulletin. Revised Technical Service Letter for Detroit DT12 TCM GHG17 Only; Bootloader Update. On Detroit DT12 equipped vehicles, it may be necessary to complete an additional step in the programming process when updating the TCM software.
D20M12020-04-24. Service bulletin. Updated DDC Field Service Campaign for GHG14 DETROIT DD13 with Two-Box Aftertreatment Software Reprogramming. Certain Detroit Model Year 2013 to 2015 GHG14 DD13 engines that are registered in California will require reprogramming to a minimum of the MCM software version and fuel map version listed below: MCM Software Version 4.7.0.0 ZGS 005. Certain sections have been updated for clarity.
SB54-2392019-11-20. Service bulletin. Service Bulletin for Cascadia Cabin CAN ECU Compatibility. Compatible software levels are required for the proper operation of the vehicle.
D19R22019-10-01. Service bulletin. DDC Emission Recall for GHG17 MDEG Platform DD8“ Software Reprogramming For California Inspection and Maintenance
ICI19-016 SF5602019-06-10. Service bulletin. Revised Bulletin
sb543082019-06-03. Service bulletin. sb54308 Chassis ECU Programming
aeoD18M22019-04-08. Service bulletin. Field Service Campaign D18M2 GHG17 GHG17 Detroit DD13® Software Reprogramming and Emission Label Replacement for Motor Coach Industries, Inc. (MCI®)
D18M22019-04-08. Service bulletin. Field Service Campaign-D18M2 - REVISION 1 GHG17 Detroit DD13® Software Reprogramming and Emission Label Replacement for Motor Coach Industries, Inc. (MCI®)
18CSA92018-12-10. Service bulletin. 18CSA9 Release of DiagnosticLink® 8.08