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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
CALABSMODVALVE2020-05-14. Service bulletin. SERVICE BRAKES, AIR; SERVICE BRAKES, HYDRAULIC. Customer Advisory Letter for ABS Modulator Valve Replacement. DTNA has decided to remove and replace the ABS modulator valves as part of an ongoing supplier quality study.
SB60-1642020-04-29. Service bulletin. EXTERIOR LIGHTING. Service Bulletin for Marker Light Gasket Leaks, New Cascadia. This bulletin replaces the version dated June 17,2019. A procedure has been added for inspection, repair, and replacement of damaged or spun rivet nuts.
WI20-0082020-04-28. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Warranty Information Letter for Warranty Training Online. DTNA is pleased to announce the release of new Warranty-related training videos. The videos provide Warranty content in short instructional videos that are available on demand through the AftermarkeTV Video Channel icon on the Aftermarket Resource Center (ARC) home page.
DASHLiftAxle2020-04-27. Service bulletin. POWER TRAIN. DASH announcement for Hendrickson Optimaax 6x2 Lift Axle. Freightliner recently announced the availability of the Hendrickson Optimaax 6x2 lift axle. Due to quality concerns discovered late with pre-series builds, Freightliner has implemented a block in SpecPro as of April 9, 2020, to prevent ordering or quoting of this component until further notice.
20CSA-062020-04-26. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Customer Service Announcement for Gen 5 DD15 Customer Demo Units. To grow on continued success in the market place, we continue to innovate, test and field new products that deliver on Total Cost of Ownership. The test process allows us to field a limited number of Gen 5 DD15 Customer Demo Units (CDU) to further ensure we meet the stringent demands of our customers. There will be approximately twenty CDU vehicles delivered between April and July of 2020. These units may need to be serviced during their time in customer's hands. Initially, there will be limited service procedures available and parts information will not be available in PartsPro.
WP20-0072020-04-23. Service bulletin. EQUIPMENT. Warranty Policy Letter for Chassis Progressive Damage Policy Change. Effective for repair orders opened on or after April 27, 2020, if an Authorized Service Location installed a part which later has a warrantable failure, progressive damage and labor may be covered under the Aftermarket Parts Limited Parts Warranty (Parts Warranty).
WP20-0062020-04-23. Service bulletin. EQUIPMENT. Warranty Policy Letter for Handling for Authorized Service Location Part Transfers. To promote 24-hour throughput and maximum efficiency, DTNA is adjusting multiple handling policies: Launching a new handling allowance for parts ordered from another Authorized Service Location because the facing Part Distribution Center (PDC) is out of stock Retiring Detroit's Customer First Program
WP20-0052020-04-23. Service bulletin. EQUIPMENT. Warranty Policy Letter for Handling Change: Over the Counter Aftermarket Parts Replacement Program. DTNA is pleased to announce that handling will increase to 33% for Misc. Replacement Part type claims filed under the Over the Counter (OTC) Aftermarket Parts Replacement Program.
WI20-0042020-04-23. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. Warranty Information Letter for Warranty Long Block Program Change. The Detroit Reman Long Block Program has expanded. The expansion reduces complexity in ordering reman engines and promotes stocking reman engines to meet uptime commitments.
SB60-1672020-04-22. Service bulletin. STRUCTURE. Service Bulletin for Draining Water Trapped in the Upper A-Pillar. A water leak in the seams between the cab roof and cab side wall or back wall can result in water becoming trapped in the upper A-pillar area in some Cascadia and New Cascadia vehicles. This water may migrate inside the cab and eventually spill through the marker light fastener clearance holes and drip on the dash.
SB60-1682020-04-18. Service bulletin. VISIBILITY; STRUCTURE. Service Bulletin for Installing Rain Gutters for Upper Door Seal Leaks. New Cascadia day cab vehicles with roof fairings may experience minor water leaks through the upper door seals. This issue can be minimized by regularly wiping down the door seals to keep them free of road grime. A rain gutter seal can also be installed above each door using a Cascadia tertiary seal (part number 18-63286-002).
SB60-1702020-04-18. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Service Bulletin for Wear Pad Installation. The area of the floor mat near the throttle pedal is more prone to wear. To extend the life of a floor mat, a wear pad can be installed on it near the throttle and brake pedal area.
SB60-1692020-04-18. Service bulletin. VISIBILITY. Service Bulletin for Replacing Windshield Gasket. Different types of cab leaks can result in water dripping from the top of the windshield, onto the dash. Replacing a windshield gasket unnecessarily may create new leak issues. Do not replace a windshield gasket unless it has been confirmed to leak, using the cab pressure test.
SB54-3252020-04-17. Service bulletin. LANE DEPARTURE. Service Bulletin for New Cascadia ICUC Active Lane Assist (ALA) Dash Menu Discrepancy. New Cascadia vehicles equipped with Detroit Assurance 5.0 that are not equipped with Active Lane Assist (ALA) may incorrectly display ALA availability in the ICUC quick access menu. The following procedure will provide a parameter update to correct the ICUC menu display.
SB54-3232020-04-17. Service bulletin. EQUIPMENT. Service Bulletin for New Cascadia Pana-Pacific 540 Radio Controls Not Operating Normally. Pana-Pacific DEA540 radios (A22-74389-000) may cease to respond to volume control settings from the steering wheel switches or the controls on the radio faceplate, resulting in erratic volume control. The procedure to check the current software version of the radio is updated.
SS10346862020-04-09. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. Service Solution for P4 New Cascadia with Manual Transmissions Does Not Use Bottom Of Clutch Switch For Starting. On the prior P3 Legacy Cascadia vehicles with manual transmission, the Bottom of Clutch (BOC) switch could be uses as an interlock for the engine crank circuit. If programmed in the SAM Cab, the engine crank circuit would require the clutch to be fully depressed in order for the engine to crank. P3 also offered a neutral switch as an interlock that could be used instead of the BOC and would require the transmission to be neutral in order for the engine to crank. P4 New Cascadia only offers the neutral switch as the interlock for engine crank.
SS10346842020-04-09. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Service Solution for P4 New Cascadia Road Lamp Strain Relief and Water Protection For Electrical Connection. The connector that attaches to the road lamp is exposed to water spray from the vehicles front tires. Even though the connector is sealed, water spray, in conjunction with wiring that may be pulled sideways, can attribute to water intrusion into the connector.
CALFTLWS000-012020-04-09. Service bulletin. TIRES; WHEELS. Customer Advisory Letter for GWR Label Correction. Freightliner 108SD/114SD, Coronado, New Cascadia, and Business Class M2 vehicles and Western Star 4700 and 4900 vehicles equipped with a certain tire rating have the wrong Component GWR label. DTNA is requesting the current Component GWR label be replaced with the correct label.
SS10346822020-03-31. Service bulletin. ENGINE AND ENGINE COOLING. Service Solution for Updated Common Telematics Platform (CTP) Installation and Activation Procedure. Some new CTPs being installed in the field have failed to activate and do not communicate with Detroit Connect back end. The activation of the CTP requires that the VIN and CTP serial number pair is transmitted from DiagnosticLink to the Detroit Connect registration server. When using the old procedure, there may be some factors that may prevent that VIN and CTP Serial Number pairing data from uploading to the server.
SB32-0332020-03-31. Service bulletin. SUSPENSION. Freightliner Service Bulletin for Front Axle Spacer Replacement. This service bulletin replaces the version dated 05/01/2016. This bulletin is updated to include the parts list. Some vehicles may exhibit a lean (right or left) due to weight difference on the front suspension. While this does not affect the operation of the vehicle, it may be visually unpleasing to many customers. To correct this condition, replace the existing front axle spacer on the low side of the vehicle with a thicker one.
SS10346802020-03-23. Service bulletin. EQUIPMENT. Service Solution for New Cascadia Bluetooth Microphone Relocation. Some fleet drivers are complaining about a lack of reception of the Bluetooth microphone due to it's proximity in the center of the overhead console. The Bluetooth microphone can be relocated into the driver's side overhead panel, either left hand or right hand drive applications.
20CSA-042020-03-22. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. Customer Service Announcement saying that Service Pack (SP) 3 for DiagnosticLink® 8.11 Standard and Professional will be available for download from the Detroit Diesel server.
SS10346702020-03-19. Service bulletin. ELECTRICAL SYSTEM. Service Solution for fault code VRDU 524127/9 - lost communication with the MPC. VRDU fault code 524127/9 is often caused by lack of ignition supply to the MPC, which causes it to stop communicating.
03.2020 Campaign2020-03-18. Service bulletin. EQUIPMENT. Open recall and Field service Campaigns report send out to Dealers, General Managers, Service managers and warranty managers.
SB00-0382020-03-18. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; SUSPENSION. Freightliner Service Bulletin for vibration troubleshooting - finding the cause. This version replaces the version dated 5/1/14 and adds New Cascadia.

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