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
| TechTalk7735 | 2020-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on Aftertreatment System Problem Detected after performing D20M8 recall. |
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| TechTalk7709 | 2020-10-01. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ENGINE AND ENGINE COOLING. Tech talk discussion on inaccurate reading DEF gauge. |
| TechTalk7708 | 2020-10-01. Service bulletin. VEHICLE SPEED CONTROL; LANE DEPARTURE. Tech Talk discussion on Detroit Assurance shutting down. |
| TechTalk7669 | 2020-10-01. Service bulletin. EQUIPMENT. Tech talk discussion on Parksmart Fan Control. |
| TechTalk7686 | 2020-10-01. Service bulletin. EQUIPMENT. Tech Talk discussion on CTP Update Issues |
| TechTalk7679 | 2020-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on repair verification for codes like 'low air flow' when a trailer is not available. |
| TechTalk7677 | 2020-10-01. Service bulletin. AIR BAGS. Tech Talk discussion on cab air bag mounts. Passenger side air bag leaning. |
| TechTalk7676 | 2020-10-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Tech Talk discussion on new Cascadia P4 ICU issue for clearing codes after updating. |
| TechTalk7663 | 2020-09-30. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE. Tech Talk discussion on D20M8-A No updated CPCA software available. |
| TechTalk7644 | 2020-09-30. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on Possible new regen strategy on GHG 17. |
| TechTalk7518 | 2020-09-30. Service bulletin. EQUIPMENT. Tech talk discussion on P4 radio for 500k system. |
| TechTalk7463 | 2020-09-30. Service bulletin. SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM. Tech Talk discussion on ABS trailer code 520216 31 P4 New Cascadia. |
| TechTalk7182 | 2020-09-30. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER. Tech Talk discussion on New Cascadia front blower motor inoperative. |
| TechTalk4855 | 2020-09-30. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY; INTERIOR LIGHTING. Tech Talk discussion for P4 Next Gen Cascadia dome lights stay on while driving. |
| TechTalk4725 | 2020-09-30. Service bulletin. STEERING; EQUIPMENT. Tech Talk discussion about power steering fluid. |
| TechTalk4563 | 2020-09-25. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Tech Talk discussion for P4 New Cascadia ICU display blank but gauges still work. |
| CTP Letter | 2020-09-25. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. Customer Letter explaining for certain vehicles the software updates for the CTP will require monitoring and may affect service availability. |
| SS1034670 | 2020-09-24. Service bulletin. ELECTRICAL SYSTEM:IGNITION; ENGINE; EQUIPMENT. Service Solution for Fault Code VRDU 524127/9 - Lost Communication with the MPC. This Service Solution has been superseded to service bulletins SB 54-336 and 54-329. Please see the service bulletins for the most current information. VRDU fault code 524127/9 is often caused by lack of ignition supply to the MPC, which causes it to stop communicating. This usually occurs when voltage is low. |
| SF607 | 2020-09-17. Service bulletin. ENGINE AND ENGINE COOLING. Field Service Campaign for Freightliner Cascadia LG1 Radiator Inlet Hoses. The radiator and upper hose assembly have an alternate design available which may extend the life of the radiator hose and prevent leaking connectors. |
| SB54-336 | 2020-09-17. Service bulletin. ELECTRICAL SYSTEM. Freightliner Service Bulletin for Rewiring the MPC2 Camera Fuse. The multipurpose camera 2 (MPC2) power is supplied via fuse 14 (F14) in New Cascadia vehicles built before August 24, 2020. With this configuration, fault code 232/524127/9 - "Lost Communication to MPC" becomes active during low voltage disconnect (LVD) situations when load shedding is required to maintain critical systems. These instructions provide the procedure for moving the MPC2 power supply from fuse 14 (F14) to fuse 35 (F35). Moving the MPC2 power supply requires the installation of a new etched vehicle power distribution module (VPDM) cover to document the new MPC2 location. |
| CONMET DISC BRAK | 2020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. ConMet Disc Brake Communication for vehicles with flat rotor disc brakes with aluminum hubs may have rotor mounting studs fracture due to hydrogen embrittlement. A hold has been placed on vehicles at plants and facilities to inspect before releasing for delivery. |
| CONMET HUB COMMU | 2020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. ConMet Hub Communication on rotor mounting studs installed on steer and drive hubs on vehicles with flat rotors may fracture due to hydrogen embrittlement. Inspection of vehicles may delay delivery of vehicles. |
| CONMET FLAT ROTO | 2020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. ConMet Work Instructions for Inspection of ConMet Disc Brake Rotor to Hub Fastener. Please see the attached instructions on inspecting the ConMet disc brake rotor to hub fastener. Rotor mounting studs installed on steer and drive hubs on vehicles with flat rotors may fracture due to hydrogen embrittlement. |
| CALFTL35-001 | 2020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. Customer Advisory Letter for Inspection of ConMet Disc Brake Rotor to Hub Fastener. Our records indicate that you are the owner of certain vehicles and therefore DTNA is sharing the following documentation with you. Please see the attached instructions on inspecting the ConMet disc brake rotor to hub fastener. |
| SS1034348 | 2020-09-16. Service bulletin. ELECTRICAL SYSTEM. Service Solution for New Cascadia Unintended 4-way Flashers Activation. As of 8/24/2020 SSAMs received an internal software change that cannot be updated in the field. The software change eliminates the unintended 4-way flasher activation issue documented in this solution. For P4 vehicles built before 8/24/2020 this solutions still applies. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.