WenmarOpen by Wenmar Pro

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: Equipment and accessories are shown. Show all

Bulletins, newest first
SS10347822020-09-01. Service bulletin. EQUIPMENT. Service Solution for New Cascadia Bluetooth Microphone Relocation. Similar to Service Solution 1034680 which also informs about relocating the microphone.
SS10347622020-09-01. Service bulletin. EQUIPMENT. Service Solution for P4 Cascadia Front HVAC Evaporator Freezing. Front evaporator freezes creating ice buildup, reducing airflow through the vents. The evaporator freezing condition is very hard or cannot be duplicated, in a repair facility. Because the condition is hard to duplicate, determining root cause is still under investigation.
CALFTL54-0112020-09-01. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Customer Advisory Letter for How to program the IPPC module using DiagnosticLink.
CALFTL54-010REV2020-09-01. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; EQUIPMENT. Revised Customer Advisory Letter for New Cascadia ABS Warning Light Illumination work instructions. Due to the enhanced vigilance of the New Cascadia ABS controller, some fault codes and indicator lights do not necessarily require immediate maintenance attention. DTNA and WABCO are currently jointly working on a long-term corrective plan for the condition. REVISED: This CAL replaces the CAL issued June 17th, 2020. The phrase "if equipped" in reference to cab load disconnect switches has been removed.
ICI20-0262020-09-01. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Important Campaign Information Letter informing that revised bulletins for Detroit Diesel campaigns D20R1REV1 and D20M8REV1 have been posted on DTNAConnect.
ICI20-022R2020-08-29. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Revised letter is to announce a reimbursement available to dealers for travel to a customer's location to perform a recall or field service campaign. Potential travel reimbursement applies to DTNA truck dealers and Detroit Diesel distributors. Thomas Built Buses will be addressed separately.
SB26-0512020-08-29. Service bulletin. POWER TRAIN; EQUIPMENT. Updated Service Bulletin for DT12 Transmission Cooler Retrofit. This bulletin replaces the version dated 09/18/2019. The part number for the oil control valve has been updated in the parts table.
ICI20-0222020-08-05. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Important Campaign Information letter announcing Dealer Travel for Campaign Performance. This letter is to announce a reimbursement available to dealers for travel to a customerâ™s location to perform a recall or field service campaign.
WI20-0142020-08-05. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Warranty Information Letter for OWL and Warranty Manual Improvement: Sublets and Travel Time/Distance. In the spirit of continuous improvement, DTNA reviewed sublet-related policies and procedures. The goal was to improve language clarity and optimize processes.
WI20-0122020-08-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Warranty Information Letter informing that to ensure that DTNA policies and service network practices align, the Warranty Department will be revising the Warranty Manual.
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.
SS10347582020-07-28. Service bulletin. EQUIPMENT:ELECTRICAL; VISIBILITY. Service Solution for New Cascadia Window Regulator Motor Stop Working. The window regulators motors are not designed to be run continuously. The window regulator motors have a thermal cutoff. If they are run long enough, there will eventually be an open circuit and get a fault code.
SF6112020-07-28. Service bulletin. EQUIPMENT. Field Service Campaign for Cascadia CTP Reset. Certain vehicles equipped with DTNA's proprietary Common Telematics Platform (CTP) are not communicating and, therefore, are unable to benefit from over-the-air software updates. The CTP will be reset and some will also be initialized.
SB60-1702020-06-13. Service bulletin. EQUIPMENT. 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.
SB26-0532020-06-04. Service bulletin. EQUIPMENT; POWER TRAIN. Service Bulletin for Eaton-Cummins Endurant Transmission. A new line of transmissions will be available in the Freightliner vehicles at the beginning of April 2020. The Eaton-Cummins Endurant is a manual transmission that uses compressed air for shifting and clutch actuation. It also requires a specific clutch assembly that is different than the current Eaton product line.
20TS-032020-05-23. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Technical Service Letter for DD Heavy Duty Platform Belt Tensioner Change. A newly designed, dual-arm friction shoe damping tensioner was implemented for the DD Heavy Duty Platform.
CALWALMART2020-05-23. Service bulletin. EQUIPMENT; STEERING. Customer Advisory Letter for Walmart for Draglink Inspection. Walmart to inspect the draglink for a loose castlenut at the steering arm connection point.
CALFTL01-0022020-05-21. Service bulletin. EQUIPMENT. Customer Advisory Letter for Incorrect Horsepower Rating. Affected vehicles will have their MCM reprogrammed.
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.
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.
SB60-1702020-04-18. 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.

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