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Service bulletins for the 2021 Freightliner Cascadia

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.

509 on file from NHTSA, as of 2026-10-19.

By type

By component

Only bulletins with component: Fuel system are shown. Show all

Bulletins, newest first
MyCom_02062026-12026-03-04. Other. FUEL/PROPULSION SYSTEM. My Communications for update on UFU R61709 Fuel Filters
MYCOM_10302025-12025-11-05. Other. FUEL/PROPULSION SYSTEM. My Communications for Update to DTNA parts on UFU R61709
MYCOM_09022025-12025-10-03. Other. FUEL/PROPULSION SYSTEM. My Communications for UFI 0-Ring Announcement
PB47-022-FTL2025-10-03. Service bulletin. FUEL/PROPULSION SYSTEM. Revised Parts Bulletin for Cascadia 23-inch Diameter Fuel Tanks
MYCOM_08212025-12025-09-02. Other. FUEL/PROPULSION SYSTEM. My Communications for UPDATE TO DTNA PARTS QUALITY ALERT STOCK HOLD on UFU R61709
MYCOM_08182025-12025-09-02. Other. FUEL/PROPULSION SYSTEM. My Communications for Parts Hold on UFU Filter
SS3102-FTL20222022-06-04. Service bulletin. FUEL SYSTEM, GASOLINE. Service Solution for 100/120/130 Gallons Fuel Tanks interference/rubbing with fairing bracket.
CALFTL47-001B2021-08-27. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, DIESEL. Revised Customer Advisory Letter for Correction of Low Pressure Fuel Line Installation to Ensure Proper Clearance. Revision Information: Figures have been updated to better show the issue being addressed.
SS3082FTL20212021-07-22. Service bulletin. FUEL SYSTEM, GASOLINE. Service Solution for New Cascadia Fuel Sending Unit Connector Loose.
SS10330942021-06-09. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:MANIFOLD PRESSURE (MAP) SENSOR. Service Solution SS 1033094 KUS Float Tube Fuel Level Sensor Inform...
FAB1532021-05-18. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE. Freightliner Action Bulletin FAB153 New Harness Highway for Cascadia
CALFTL47-0012021-03-26. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, DIESEL. Customer Advisory Letter for Correction of Low Pressure Fuel Lines Installation to Ensure Proper Clearance.
18SP7442020-12-08. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:FUEL RAIL. Special Publication letter for Two-Filter Fuel System KM59 GEN1 DD15 DD16 Severe Duty High Pressure Fuel Rail Feed Lines Service Kit.
DCFuelAnalytics2020-11-26. Service bulletin. FUEL SYSTEM, GASOLINE. Detroit Connect Customer Communication for vehicle trips not populating in the Vehicle History Trips page. This may affect Fleet Fuel Analysis and Fuel Economy Calculations.
TechTalk77352020-11-03. Service bulletin. FUEL SYSTEM, OTHER; ENGINE AND ENGINE COOLING. Tech Talk discussion on 1 Aftertreatment System Problem Detected.
TS10330142020-07-31. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP; ENGINE AND ENGINE COOLING. Training Solutions for Fuel Leak Found at High Pressure Fuel Pump Weep Hole for Heavy Duty DD Engines. Occasionally we see trucks come in with fuel leaking from the high pressure fuel pump weep hole. This is NOT a defect in the pump and further diagnostics need to be performed to find the root cause.
SB49-0412020-05-23. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL; FUEL SYSTEM, DIESEL. Service Bulletin for Remote-Fill DEF Tank Fill Port Torque Value and Required Lubricant. Some New Cascadia vehicles with chassis fairings have remote-fill Diesel Exhaust Fluid (DEF) tanks which have new instructions to replace the remote fill hose and fitting. Proper torque value is critical, as the remote-fill fittings are plastic and can easily crack if overtightened. The gasket on the fill fitting is sensitive to improper installation, and can get pinched, resulting in a DEF leak.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.