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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: Engine are shown. Show all

Bulletins, newest first
TSB30-013-FTL2024-04-02. Service bulletin. ENGINE AND ENGINE COOLING. Technical Service Bulletin for Off-Road/Low Traction Throttle Parameter Update
SS3142-FTL2024-04-02. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. Service Solution for J1939 CAN issues for vehicles equipped with Bendix Side Radar with expanded field of view
TSB30-013-FTL2024-03-06. Service bulletin. ENGINE AND ENGINE COOLING. Technical Service Bulletin for Off-Road/Low Traction Throttle Parameter Update
ICI24-0062024-03-06. Service bulletin. ENGINE AND ENGINE COOLING. Important Campaign Information letter for FL974 - Revised Bulletin & Population
FL9742024-03-06. Service bulletin. ENGINE AND ENGINE COOLING. Revised Emissions Recall: Cummins DEF Sensor Shortage. REVISION: Some vehicles formerly in Group F have been moved to Group G and have been assigned a new part number as specified in Table 1. An SRT for 'Calibration Code Only: Update or Confirm' has been added, as shown in Table 2, to be used when a new DEF header is not required. There have been some other minor changes to the work instructions and SRT times.
FL9742024-02-06. Service bulletin. ENGINE AND ENGINE COOLING. Emissions Recall: Cummins DEF Sensor Shortage
ICI24-0022024-02-06. Service bulletin. ENGINE AND ENGINE COOLING. Important Campaign Information letter for DDC D21M6 and D22M6 - Campaign Extended
CALFTL54-0312023-10-05. Service bulletin. ENGINE AND ENGINE COOLING. Customer Advisory Letter for Towing Related to Low Coolant Faults
D21M6REV42023-04-07. Service bulletin. ENGINE AND ENGINE COOLING. Revised Detroit Field Service Campaign for Gen 5 Customer Demo Unit (CDU) and Pre-Series Unit Retrofits. D21M6 REVISION : Page 1 of the bulletin under "Replacement Parts" and "IMPORTANT" have been revised.
ICI23-0032023-02-02. Service bulletin. ENGINE AND ENGINE COOLING. Important Campaign Information Letter for DDC D21M6, Termination Date Extended
SS3113-FTL20222022-11-02. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Service Solution for DPF Harness Rub-Chafe onTrans-Wire Braided Air Hose.
ICI22-0202022-06-04. Service bulletin. ENGINE AND ENGINE COOLING. Important Campaign Information for DDC D21M6 - Third Revised Bulletin. This letter is to inform you that a revised bulletin for DETROITTM Field Service Campaign D21M6 - Gen 5 Customer Demo Unit (CDU) and Pre-Series Unit Retrofits is available on DTNAConnect.
D21M6REV32022-06-04. Service bulletin. ENGINE AND ENGINE COOLING. Revised Detroit Field Service Campaign for Gen 5 Customer Demo Unit (CDU) and Pre-Series Unit Retrofits.
SB83-1372022-04-01. Service bulletin. ENGINE AND ENGINE COOLING. Revised Freightliner Service Bulletin for ParkSmart Eberspaecher Auxiliary Heater Service. This bulletin replaces the version dated May 2015. The note in General Information has been revised to include New Cascadia. Espar information has been changed to reflect a company name change to Eberspaecher.
SB49-0422022-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Freightliner Service Bulletin for DEF Connector Reinforcement Caps.
D21M6REV22022-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Revised Detroit Field Service Campaign for Gen 5 Customer Demo Unit (CDU) and Pre-Series Unit Retrofits.
D21M6REV12022-02-05. Service bulletin. ENGINE AND ENGINE COOLING. Gen 5 Customer Demo Unit (CDU) and Pre-Series Unit Retrofits. Specific 2021 Freightliner New Cascadia model vehicles, powered with DETROIT Gen 5 DD15 Engines manufactured February 3, 2020, through December 14, 2020
D21M62021-08-28. Service bulletin. ENGINE AND ENGINE COOLING. Detroit Field Service Campaign for Gen 5 Customer Demo Unit (CDU) and Pre-Series Unit Retrofits. Certain Customer Demo Unit (CDU) and Pre-Series vehicles with Gen 5 engines require engine retrofits to bring the engines up to full production specifications.
20TS-112021-08-28. Service bulletin. ENGINE AND ENGINE COOLING. Technical Service Letter for Detroit CPC501T GHG21 Only; Updating Bootloader Using DL version 8.14 and higher. On Detroit powertrain equipped Cascadia’s, built in 2020, it may be necessary to complete an additional step in the programming process when updating the CPC501T software.
FAB1532021-05-18. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE. Freightliner Action Bulletin FAB153 New Harness Highway for Cascadia
TechTalk566191K2021-05-07. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on SPN 61683 FMI 16 DATA VALID BUT ABOVE NORMAL OPERATING RANGE - MODERATELY SEVERE LEVEL.
WI21-0092021-04-24. Service bulletin. ENGINE AND ENGINE COOLING. Warranty Information letter announcing that DTNA is increasing the Standard Diagnostic Times (SDTs) shown. The updated after treatment system (ATS) diesel exhaust fluid (DEF) pump times will be applied to repair orders opened on or after April 12, 2021.
SF6192021-03-31. Service bulletin. ENGINE AND ENGINE COOLING. Field Service Campaign for Cascadia Cummins Natural Gas Engine Exhaust Shield. On certain vehicles, there may be early heat degradation at the front right cab mount due to excessive heat exposure. An exhaust shield will be installed on all vehicles involved.
CALFTL49-0022021-03-26. Service bulletin. ENGINE AND ENGINE COOLING. Customer Advisory Letter for Adding Exhaust Shim to ATS Exhaust Outlet and Replacing Exhaust Elbow and Clamp. An undersized ATS outlet pipe was installed on these vehicles, causing the exhaust clamp used to fasten the exhaust elbow to not clamp securely.
SB49-0382021-03-24. Service bulletin. ENGINE AND ENGINE COOLING. Revised Freightliner Service Bulletin for netized Fill Neck for Six-Gallon DEF Tanks. A design change removed the magnets from the fill necks for some 6-gallon diesel exhaust fluid (DEF) tanks. If the vehicle is equipped with a non-magnetic fill neck 04-32529-000, it can be updated to a magnetic neck 04-32529-001. This bulletin replaces the version dated 04/18/2017. Updated availability of magnetic fill neck option for other diesel exhaust fluid (DEF) tank part numbers.

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