2021 Freightliner Cascadia Technical Service Bulletins

509 technical service bulletins (TSBs) are on record for the 2021 Freightliner Cascadia. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11035536Jul 21, 2026Forward collision avoidance. Truck Equipment Manufacturer upfit guide for Detroit Assurance Forward Radar Relocation and Adjustment
• 11035527Jul 8, 2026Transmission and drivetrain. Revised Technical Service Bulletin for ABS Wheel Speed Fault Code Correction for MBSP Equipped Vehicles. Updated frequently asked questions.
• 11034519Jun 18, 2026Exterior lighting. CX Advocate for Utility Lamp water intrusion
• 11033103May 8, 2026Transmission and drivetrain. Revised Technical Service Bulletin for DT12 OVX Transmission Refresh
• 11031981Apr 16, 2026Lane departure. CX Advocate for P4 Side Guard Assist On/Off Menus and Trailer Functionality (TSB-54-381-FTL)
• 11031973Apr 15, 2026Transmission and drivetrain. Important Campaign Information for SF706 - Revised, Reactivated
• 11031972Apr 15, 2026Transmission and drivetrain. Revised Field Service campaign for Cascadia Axle Conversion: Adaptive Tandem (AT) 6x4 to New Final Drive (NFD)
• 11031971Apr 15, 2026Transmission and drivetrain. Revised Field Service campaign for Cascadia Axle Conversion: Adaptive Tandem (AT) 6x4 to New Final Drive (NFD)
• 11031966Apr 9, 2026Electrical system. Fleet Communications for solenoid issues
• 11030500Mar 19, 2026Brakes. CX Advocate for 1810/02 ABS longitudinal acceleration fault (TSB-54-104-WST,TSB-54-379-FTL)
• 11030493Mar 2, 2026Transmission and drivetrain. Important Campaign Information letter for SF706 - campaign suspended
• 11029522Feb 25, 2026Transmission and drivetrain. Fleet Communications for SF706 - Cascadia axle conversion
• 11029519Feb 25, 2026Brakes. Fleet Communications for TSB-54-379-FTL & TSB-54-104-WST ESC warning lamp and ECU replacement
• 11029516Feb 16, 2026Transmission and drivetrain. Field Service campaign for Cascadia Axle Conversion: Adaptive Tandem (AT) 6x4 to New Final Drive (NFD)
• 11029515Feb 16, 2026Transmission and drivetrain. Field Service campaign for Cascadia Axle Conversion: Adaptive Tandem (AT) 6x4 to New Final Drive (NFD)
• 11029509Feb 16, 2026Transmission and drivetrain. Field Service campaign for Cascadia Axle Conversion: Adaptive Tandem (AT) 6x4 to New Final Drive (NFD)
• 11029512Feb 6, 2026Fuel system. My Communications for update on UFU R61709 Fuel Filters
• 11029633Feb 3, 2026Suspension. Fleet Communications for composite front suspension bushing
• 11028071Jan 28, 2026Brakes. Revised Technical Service Bulletin for ESC Warning Lamp and ECU Replacement
• 11028073Jan 26, 2026Transmission and drivetrain. Revised Technical Service Bulletin for DT12 Excessive Wear
• 11028064Jan 22, 2026Brakes. Technical Service Bulletin for ESC Warning Lamp and ECU Replacement
• 11028063Jan 22, 2026Transmission and drivetrain. Technical Service Bulletin for DT12 Excessive Wear
• 11028069Jan 15, 2026Transmission and drivetrain. CX Advocate for Aftermarket Transmission Support
• 11028061Jan 15, 2026Other or unknown. Technical Service Bulletin for Cascadia Generations
• 11028062Jan 6, 2026Transmission and drivetrain. Technical Service Bulletin for DT12 PTO Upfit
• 11027503Dec 11, 2025Steering. Fleet Communications for Power Steering Resevoir - NTF Replacements
• 11027502Dec 11, 2025Transmission and drivetrain. Fleet Communications for Detroit Axle NFD ALM to Passive Lube Management
• 11027500Dec 11, 2025Transmission and drivetrain. Fleet Communications for NFD Lower Oil Plug Location - SP Axles
• 11027497Dec 11, 2025Transmission and drivetrain. Fleet Communications for Detroit NFD Axle - Factory Fluid Change
• 11027496Dec 11, 2025Other or unknown. Fleet Communications for Mudflap Hanger Bracket Fixturing
• 11027493Dec 11, 2025Engine. Fleet Communications for Heater Core Plugging
• 11027491Dec 11, 2025Suspension. Fleet Communications for Cascadia Front Suspension Spring Pin Bushings
• 11027487Dec 11, 2025Brakes. Fleet Communications for ABS Wheel Speed Sensor Faults
• 11026469Nov 20, 2025Electrical system. Fleet Communication for SS 3174-FTL
• 11026454Nov 20, 2025Electrical system. Fleet Communications for Key off amp draw
• 11026453Nov 20, 2025Engine. Fleet Communications for Power Steering Reservoir Fill Cap Venting
• 11026421Nov 19, 2025Engine. Fleet Communications for Low Coolant Sensor
• 11026420Nov 19, 2025Steering. Fleet communications for Bosch Steering Gear Replacements
• 11024979Oct 30, 2025Fuel system. My Communications for Update to DTNA parts on UFU R61709
• 11024978Oct 29, 2025Lane departure, Forward collision avoidance. Features and Benefits for SafetyDirect 5.1
• 11024972Oct 23, 2025Visibility (wipers, defrost, mirrors). Service Solution for P4 Main Mirror Arm Covers Loose - Falling Off
• 11025096Oct 16, 2025Suspension. CX Advocate for 18k Front Suspension Shock Absorbers
• 11025094Oct 16, 2025Brakes. CX Advocate for Experiencing Excessive Purging from Air Dryer
• 11024966Oct 16, 2025Electrical system, Transmission and drivetrain. CX Advocate for technical questions/issues raised
• 11024962Oct 16, 2025Engine. CX Advocate for P4, WST X-Series, DD Engines Low/Critical Low Coolant Warnings
• 11024958Oct 16, 2025Engine. CX Advocate for ConMet Oil Pan Insert Additional Issues
• 11023686Sep 24, 2025Suspension. Field Service Campaign for SF721 18k Front Suspension Shock Absorbers
• 11023685Sep 24, 2025Suspension. Field Service Campaign for SF721 18k Front Suspension Shock Absorbers
• 11023684Sep 24, 2025Suspension. Field Service Campaign for SF721 18k Front Suspension Shock Absorbers
• 11023683Sep 18, 2025Engine, Transmission and drivetrain. CX Advocate for technical questions/issues raised

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