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
| SS1034867 | 2021-02-27. Service bulletin. SEAT BELTS. Service Solution for New Cascadia Seat Belt Warning Harness Routing |
|---|---|
| CALFTL32-010 | 2021-02-27. Service bulletin. STEERING; EQUIPMENT. Customer Advisory Letter for New Cascadia Front Steer Arm – Drag Link Ball Joint Connection Inspection. |
| CALFTL32-009 | 2021-02-27. Service bulletin. STEERING; EQUIPMENT. Customer Advisory Letter for New Cascadia Front Steer Arm – Drag Link Ball Joint Connection Inspection. |
| SF608 | 2021-02-26. Service bulletin. SERVICE BRAKES, AIR; SERVICE BRAKES. Field Service Campaign for Cascadia Road Train Brake System - Export Only. |
| SB54-341 | 2021-02-26. Service bulletin. TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS; ELECTRICAL SYSTEM. Freightliner Service Bulletin for Tire Pressure Monitoring System (TPMS) Water Intrusion. |
| SB54-308 | 2021-02-26. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; EQUIPMENT. Freightliner Service Bulletin for Programming Chassis Electronic Control Units (ECUs) With DiagnosticLink. |
| ICI21-003 | 2021-02-26. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Superseding Letter to an Important Campaign Information Letter 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. This letter supersedes ICI20-022R. |
| WI21-006 | 2021-02-26. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. Warranty Information Letter for Detroit NOx Sensor Circuit Fault Codes - Claim Guidelines. |
| WI20-014R | 2021-02-25. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Revised 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. Revisions are in blue font. |
| CALFTL01-003 | 2021-02-04. Service bulletin. ENGINE AND ENGINE COOLING. Customer Advisory Letter for Gen 5 DD15 Proactive Turbocharger Replacement. |
| TechTalk7463 | 2021-02-04. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. Tech Talk continuing discussion on ABS trailer code 520216 31 P4 New Cascadia. |
| TechTalk7669 | 2021-02-03. Service bulletin. VISIBILITY. Tech Talk continued discussion on Parksmart Fan Control |
| TechTalk8029 | 2021-02-03. Service bulletin. VISIBILITY. Tech Talk discussion on Cab vent temperatures. |
| Techtalk7980 | 2021-02-02. Service bulletin. ELECTRICAL SYSTEM. Tech Talk continued discussion on P4 dome lights comin on while driving. |
| TechTalk6985 | 2021-02-02. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on oil filter. |
| TechTalk7596 | 2021-02-02. Service bulletin. FORWARD COLLISION AVOIDANCE; LANE DEPARTURE. Tech Talk discussion on P4 radar issue. |
| Techtalk7065 | 2021-02-02. Service bulletin. VISIBILITY. Tech Talk continued discussion on New Cascadia wipers unresponsive. Wipers don't work in the first two positions. Determined to be the LDW camera wire was caught underneath the top right portion of the windshield mounting plate, thus causing the rain/light sensor to not seat all the way against the windshield. |
| TechTalk6963 | 2021-02-02. Service bulletin. EQUIPMENT. Tech Talk discussion on DO NEW CASCADIA TURN SIGNAL SWITCHES RETURN TO ORIGINAL POSITION. |
| TechTalk8009 | 2021-02-02. Service bulletin. EQUIPMENT. Tech Talk discussion on radio wont turn on with the key but only push button. |
| TechTalk7644 | 2021-02-02. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on Possible new regen strategy on GHG 17. |
| 21TS-01 | 2021-01-28. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. Technical Service Letter for Detroit Bearing Failures - Standard Diagnostic Times. DTNA is increasing repair strategies for determining the root cause of Detroit DD heavy duty lower end bearing failures. To support this strategy change, Detroit now has two (2) Standard Diagnostic Times (SDTs), easy and difficult, which can be applied to repair orders. |
| WI21-003 | 2021-01-28. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING; EQUIPMENT ADAPTIVE/MOBILITY. Warranty Information Letter for Detroit Bearing Failures - Standard Diagnostic Times. DTNA is increasing repair strategies for determining the root cause of Detroit DD heavy duty lower end bearing failures. To support this strategy change, Detroit now has two (2) Standard Diagnostic Times (SDTs), easy and difficult, which can be applied to repair orders. |
| SS1034762update | 2021-01-26. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. This Service Solution has been superseded by Service Bulletin SB54-338. Service Solution for P4 Cascadia Front HVAC Evaporator Freezing. Front evaporator freezes creating ice buildup, reducing airflow through the vents. |
| WI21-001 | 2021-01-26. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. Warranty Information Letter for Detroit New Service Replacement Engine SRT Update. While validating Standard Repair Times (SRTs) for Detroit's new Gen 5 engine series, DTNA discovered an error in a pre-Gen 5 SRT for the New Service Replacement Engine Program. As a result, DTNA re-studied the SRT and concluded that time for removing/re-installing multiple components (e.g., exhaust manifold/turbo, engine sensor harness, rocker arm assemblies, etc.) should not be included. |
| SB54-342 | 2021-01-26. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. Freightliner Service Bulletin for Rain/Light Sensor Removal. On New Cascadia vehicles, a delay in the timing of communication (hand shake) between the rain/light sensor (RLS) and sSAM generates fault code "33/521940/12 - rain/light sensor - general DTC timeout", which causes the sensor to stop working. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.