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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

Bulletins, newest first
ICI22-0172022-05-03. Service bulletin. POWER TRAIN. Important Campaign Information Letter for DDC D21M1 Termination Date Extended. This letter is to inform you that a revised bulletin for Detroit Diesel Field Service Campaign D21M1, DT12 Transmission Drive Shaft Cover Plug Reseal has been EXTENDED for an additional three months. Please use the extended termination date for all work under D21M1 from this point forward. REVISION: D21M1 termination date extended to July 1, 2022.
SB26-0542022-04-01. Service bulletin. POWER TRAIN. Revised Freightliner Service Bulletin for DT12 Transmission Control Harness Chafing the Transmission Control Module
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.
SF622REV2022-03-03. Service bulletin. SERVICE BRAKES, HYDRAULIC. Revised Field Service Campaign for Cascadia, 49X ABS MBSP+ Controller Software Update
ICI22-0152022-03-03. Service bulletin. SERVICE BRAKES, HYDRAULIC. Important Campaign Information letter for SF622 – Addition of 8x4 Vehicles to Populationx
SB54-3502022-03-03. Service bulletin. ELECTRICAL SYSTEM. Freightliner Service Bulletin for Battery Load Disconnect Switch Installation. Cab load disconnect switches (CLDS), also known as positive load disconnect, installed on selected vehicles can reduce battery drain when the vehicle is not operational.
SB49-0422022-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Freightliner Service Bulletin for DEF Connector Reinforcement Caps.
SB32-0562022-03-03. Service bulletin. SUSPENSION. Freightliner Service Bulletin for Front Spring Eye Bushing Replacement
FP54-0892022-03-03. Service bulletin. EQUIPMENT. Freightliner Parts Technical Bulletin for Discontinued Radio Replacement.
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.
SS3076-FTL20222022-02-05. Service bulletin. VISIBILITY. Main Mirror Arm Covers Loose - Falling Off. Lower arm covers designs have clips that hold the cover on but over time the clips can fail and allow the covers to become loose or fall off.
SB60-1722022-02-05. Service bulletin. STRUCTURE. Revised Freightliner Service Bulletin for Retrofit of One-Piece to Two-Piece Auxiliary Dash Panel. Minor note: added an update of document previously submitted. The related VMRS codes are added
SF6432022-02-05. Service bulletin. POWER TRAIN. Cascadia with Allison Transmission - Inconsistent Shift. On certain Freightliner Cascadia vehicles with Allison automatic transmissions, a software error may prevent the transmission from shifting out of neutral.
SB54-3482022-02-05. Service bulletin. POWER TRAIN. Meritor Rear Axle Temperature Parameters On Cascadia vehicles equipped with Meritor drive axles, the high temperature warning parameter is set too low for some applications, for vehicles equipped with synthetic oil, and for certain conditions that are not harmful to the axle.
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
SB26-0542022-01-04. Service bulletin. POWER TRAIN. DT12 Transmission Control Harness Chafing the Transmission Control Module. Classic and New Cascadia vehicles equipped with DT12 transmissions, built from approximately January 2017 to mid-March 2021, may experience rubbing/chafing on the chassis harness near the transmission.
SS3083-FTL20212021-12-02. Service bulletin. SUSPENSION. Service Solution for Aero Height Control Interfering with RDF Alignment. The Aerodynamic Height Control feature on the New Cascadia is a feature that raises and lowers the air suspension with relation to vehicle speed in order to reduce drag and achieve better fuel efficiency. The Hadley Smart Valve (HSV) is the module that makes this possible by applying and exhausting air from the rear axle suspension as necessary.
SS3076-FTL20212021-12-02. Service bulletin. VISIBILITY. Updated Service Solution for Main Mirror Arm Covers Loose -Falling Off. Lower arm covers designs have clips that hold the cover on but over time the clips can fail and allow the covers to become loose or fall off.
SF6302021-12-02. Service bulletin. LANE DEPARTURE. Field Service Campaign for Cascadia Lane Assist Software. Certain vehicles may experience the loss of Active Lane Assist (ALA) while driving due to decreased sensitivity of the steering wheel, with no visible indicator to the operator. ALA is an accessory system and the driver controlled steering function including power steering is not affected.
ICI21-0342021-12-02. Service bulletin. LANE DEPARTURE. Important Campaign Information letter for SF630 – Revised and Reactivated Bulletin. This letter is to inform you that campaign SF630, Cascadia Lane Assist Software, will be reactivated with revised work instructions Monday, 11/15/21. Please print and use the revised bulletins for all work under SF630 from this point forward.
SF6302021-11-03. Service bulletin. LANE DEPARTURE. Cascadia Lane Assist Software. Certain vehicles may experience the loss of Active Lane Assist (ALA) while driving due to decreased sensitivity of the steering wheel, with no visible indicator to the operator. ALA is an accessory system and the driver controlled steering function including power steering is not affected.
SF6152021-11-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Stoneridge ICUC Replacement. Certain vehicles equipped with a Stoneridge instrument control unit common (ICUC) were programmed using a new method to improve efficiency and align with programming for European ICUCs. All ICUCs built using the new method are permanently in the "read only" mode, and any attempt to flash will corrupt the ICUC memory.
SF6132021-11-03. Service bulletin. SERVICE BRAKES, HYDRAULIC. ConMet Front Hub to Rotor Fasteners. On certain vehicles, the front rotor nuts may not be torqued to manufacturer specification. Loose components could cause damage to the ABS tone rings, the ABS sensors, and the anchor plate mounting fasteners.
ICI21-0312021-11-03. Service bulletin. LANE DEPARTURE. SF630 Campaign Suspended. This letter is to inform you that campaign SF630, Cascadia Lane Assist Software, will be suspended today Friday, 10/22/21. On 10/22/21 you will see SF630 marked as 'Suspended' in OWL. It has been determined that a change in the procedure is necessary. A second Important Campaign Information letter will be posted when the changes have been made and the campaign is reactivated.
CTP1Updates2021-10-06. Service bulletin. EQUIPMENT. DetroitConnect follow-up customer communication for certain vehicles unable to complete over the air updates including parameters and DDEC over the air.

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