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Service bulletin 16TL20

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 id10101401
Published by NHTSA2017-05-31
Manufacturer's number16TL20
Manufacturer's date2016-10-26
NHTSA componentENGINE

NHTSA's summary

16TL20 HEAVY DUTY ENGINE VALVE STEM SEAL INSTALLING DRIFT AND SLEEVE

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

Engine

Vehicles listed
FCCC XBP2013 to 2016
FCCC XCM2011 to 2017
FCCC XCP2012 to 2017
FREIGHTLINER 114SD2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
FREIGHTLINER 122SD2014 to 2017
FREIGHTLINER BUSINESS CLASS M22009 to 2017
FREIGHTLINER CASCADIA2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
FREIGHTLINER COLUMBIA2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
FREIGHTLINER CORONADO2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
STERLING LT2007
WESTERN STAR 47002009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
WESTERN STAR 49002007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
WESTERN STAR 4900 SA2007, 2008, 2009, 2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
WESTERN STAR 57002014, 2015, 2016, 2017
WESTERN STAR 69002007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015

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

Recalls for the same vehicles and component
18V5810002018-08-30. ENGINE AND ENGINE COOLING:ENGINE:DIESEL
16V4160002016-06-09. ENGINE AND ENGINE COOLING:ENGINE:DIESEL
20162852016-06-06. Engine
15V8160002015-12-07. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE
20154842015-10-16. Engine
15V6200002015-10-02. ELECTRICAL SYSTEM:IGNITION:MODULE; ENGINE AND ENGINE COOLING:ENGINE
20153362015-07-24. Engine
15V3430002015-06-03. ENGINE AND ENGINE COOLING:ENGINE
14V6800002014-10-29. FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE
20140502014-02-21. Engine

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
FleetCom_SS 3163-FTL2025-12-06. Other. Fleet Communications for Power Steering Reservoir Fill Cap Venting
CXA 3_25_NOx2025-04-02. Other. CX Advocate for NOx conversion low faults
CXA 2_25_Turbo Oil Drain2025-03-04. Other. CX Advocate for turbo oil drain cracking
CXA 2_25_NOx2025-03-04. Other. CX Advocate for NOx conversion low faults
MYCOM_02102025-12025-03-04. Other. My Communications for Variable Speed Coolant Pump for DD13 Engines - Cascadia/57X Only
CXA 1_16_Turbo Oil Drain2025-01-29. Other. CX Advocate for turbo oil drain cracking
CXA 1_16_NOx2025-01-29. Other. CX Advocate for NOx conversion low faults
CXA 1_16_GATS2.42025-01-29. Other. CX Advocate for GATS2.4 being expanding to DD15
CXA 1_16_DD13 Altitude2025-01-29. Other. CX Advocate for DD13 Gen 5 engines operating at high altitude experience EGR slow response fault.
CXA 1_16_CARB Truck Chec2025-01-29. Other. CX Advocate for CARB tightening the Readiness Criteria applied to On-Board Diagnostic (OBD) test submissions for the Clean Truck Check.