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Service bulletin 18SP734

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 id10151476
Published by NHTSA2018-12-10
Manufacturer's number18SP734
Manufacturer's date2018-05-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE:OTHER FUEL TYPES:TURBO/SUPERCHARGER

NHTSA's summary

18SP734 18SP734?GHG14 DD15AT Turbocharger

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

Engine, Turbocharger or supercharger

Vehicles listed
FREIGHTLINER 114SD2014
FREIGHTLINER 114SD2016, 2017, 2018
FREIGHTLINER 122SD2014
FREIGHTLINER 122SD2016 to 2018
FREIGHTLINER BUSINESS CLASS M22014
FREIGHTLINER BUSINESS CLASS M22016 to 2018
FREIGHTLINER CASCADIA2014
FREIGHTLINER CASCADIA2016, 2017, 2018
WESTERN STAR 47002014
WESTERN STAR 47002016, 2017, 2018
WESTERN STAR 49002014
WESTERN STAR 49002016, 2017, 2018
WESTERN STAR 57002014
WESTERN STAR 57002016, 2017, 2018
WESTERN STAR 69002014
WESTERN STAR 69002016, 2017, 2018

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

Other bulletins for the same vehicles and component
18SP7342018-10-29. Service bulletin. 18SP734 18SP734?GHG14 DD15AT Turbocharger
308-152018-06-18. Service bulletin. 308-15 Symptom Diagnostics - Oil Present at the Turbocharger Compressor
305-132018-06-11. Service bulletin. 305-13 GHG14 DD15 Asymmetrical Turbocharger Flanged Exhaust Manifold
0140-172018-04-16. Service bulletin. 0140-17 Turbocharger Compressor Outlet Pipe
0136-172018-04-16. Service bulletin. 0136-17 GHG17 DD5 Medium Duty - Exhaust and EGR - Turbocharger Oil
0126-172018-04-16. Service bulletin. 0126-17 SPN 520295 (MCM) (GHG17) - Smart Remote Actuator 1
0504-162018-03-13. Service bulletin. Inspection of the DD13 Turbocharger
308-152018-03-05. Service bulletin. 308-15 Symptom Diagnostics - Oil Present at the Turbocharger Compressor