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: Lighting are shown. Show all
| CXA 06_26_Utility Lamp | 2026-07-06. Other. EXTERIOR LIGHTING. CX Advocate for Utility Lamp water intrusion |
|---|---|
| FAB146 | 2021-05-18. Service bulletin. VISIBILITY; EXTERIOR LIGHTING. Freightliner Action Bulletin FAB146 Cascadia LED headlights |
| P4HALOGENUPDATE | 2021-03-02. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Customer Maintenance Enhancements for the P4 Halogen Lamp replacement procedure. |
| TechTalk7857 | 2020-12-02. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Tech Talk discussion on SS1034348 P4 unintended flasher. |
| 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. |
| SB54-331 | 2020-09-16. Service bulletin. VISIBILITY; EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Updated Freightliner Service Bulletin for Updated ULB Control Unit for LED Headlamps. This bulletin replaces the version dated July 30, 2020. Information about a reman part has been added. New Cascadia vehicles with light emitting diode (LED) headlamps built from January 1, 2017 through February 17, 2020 may experience intermittent disabled headlamps due to an issue with the universal light ballast (ULB). The LED headlamps can turn off if the supply voltage drops below approximately 9V. This low voltage commonly and momentarily occurs when cranking the engine on a vehicle with batteries that are not fully charged. The momentary low voltage may cause the electronic ULB control unit to malfunction. The ULB may not resume normal function until the power supply to the headlamp is disconnected. |
| SB54-331 | 2020-07-31. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING; VISIBILITY. Freightliner Service Bulletin for Updated ULB Control Unit for LED Headlamps. New Cascadia vehicles with light emitting diode (LED) headlamps built from January 1, 2017 through February 17, 2020 may experience intermittent disabled headlamps due to an issue with the universal light ballast (ULB). The LED headlamps can turn off if the supply voltage drops below approximately 9V. This low voltage commonly and momentarily occurs when cranking the engine on a vehicle with batteries that are not fully charged. The momentary low voltage may cause the electronic ULB control unit to malfunction. The ULB may not resume normal function until the power supply to the headlamp is disconnected. |
| SB54-333 | 2020-07-30. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Service Bulletin for Installing a Fog Lamp Backshell. The connector that attaches to the fog lamp is exposed to water spray from the front tires. Even though the connector is sealed, water spray, in addition to wiring that may be pulled sideways, can cause water intrusion into the connector. A backshell can be added to the connector to provide shielding from direct water spray. It also provides strain relief for the wires entering the connector. |
| SB60-164 | 2020-04-29. 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. |
| SS1034684 | 2020-04-09. 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. |
| P4HalogenEnhance | 2020-03-04. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Customer Maintenance Enhancements for the P4 Halogen Lamp replacement procedure. |
| SB54-324 | 2020-02-15. Service bulletin. EXTERIOR LIGHTING; VISIBILITY. Service Bulletin for certain New Cascadia equipped with Detroit Assurance 5.0, may have been ordered incorrectly without automatic headlamps and rain sensing wipers. If equipped with Detroit Assurance 5.0, daytime running lights (DRL), no exterior sun visor, and no cruise control options that disengage with the headlights or wipers, the automatic headlamps and wipers can be retrofitted. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.