Service bulletins for the 2020 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.
661 on file from NHTSA, as of 2026-10-19.
By type
By component
| TechTalk8170 | 2021-03-03. Service bulletin. VISIBILITY. Tech Talk discussion on P4 WASHER FLUID LOW WARNING WITH NO SWITCH. |
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| TechTalk6741 | 2021-03-02. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on P4 cascadia codes 3597 4 & 5741 13 only active with key off |
| TechTalk6016 | 2021-03-02. Service bulletin. EXTERIOR LIGHTING. Tech Talk discussion on P4-Next Gen Cascadia Headlights. |
| TechTalk4855 | 2021-03-02. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM. Tech Talk continued discussion for P4 Next Gen Cascadia dome lights stay on while driving. |
| WI21-004 | 2021-03-02. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. Warranty Information Letter for Detroit Resources: Exploded View DD Platform and DT12 Posters. Detroit's TechComm team created visual aids for the network and released exploded view posters for DD platform engines. In early 2021, Detroit added multiple DT12 posters. |
| TechTalk7065 | 2021-03-02. 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. |
| P4HALOGENUPDATE | 2021-03-02. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Customer Maintenance Enhancements for the P4 Halogen Lamp replacement procedure. |
| 21TS-04 | 2021-03-02. Service bulletin. ENGINE AND ENGINE COOLING. Technical Service Letter for Gen 5 DD15 Instrument Panel Oil Pressure Gauge Operation. Gen 5 DD15 equipped units have been brought in for service with a complaint of the instrument panel oil pressure gauge not moving during unit operation and/or stuck at 50PSI. The instrument panel oil pressure gauge does not operate the same as with previous engine models. Please be advised, this is normal operation and no further diagnostics are required. Do not down a unit for this complaint. |
| 21OEM-06 | 2021-03-01. Service bulletin. ENGINE AND ENGINE COOLING. Starting on November 23, 2020, DiagnosticLink 8.13 (Build 4527) was made available. Current subscribers of DiagnosticLink 8.11 or 8.12 may upgrade to DiagnosticLink 8.13 at no cost. All DTNA Service shops & OEM locations are required to maintain the latest version of software on each of their stations. |
| 20TS-07REV | 2021-03-01. Service bulletin. ENGINE AND ENGINE COOLING. Revised Technical Service Letter for Cold Weather Faults on GHG17/21 DD13 with MCM Software Version 14. Due to colder weather, there may be an increase in the frequency of faults, noted below, on GHG17/21 DD13 trucks built after June 5th 2019. This is due to a calibration issue in the current MCM software (14.1.1.5 or 14.2.1.3). New software is scheduled for release in the first quarter of 2021 that will address these faults. |
| SS1034884 | 2021-02-27. Service bulletin. ELECTRICAL SYSTEM. Service Solution for P4 New Cascadia Unintended Dome Lamp Activation Due To Poor Connections at the sSAM. |
| 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. |
| CALFTL31-003 | 2021-02-27. Service bulletin. TRAILER HITCHES; EQUIPMENT. Customer Advisory Letter for Cascadia, New Cascadia, and 122SD Vehicles with Cracked Fifth Wheel Angles |
| 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. |
| TechTalk8064 | 2021-02-03. Service bulletin. LANE DEPARTURE; FORWARD COLLISION AVOIDANCE. Tech talk discussion on P4 throwing warning lights in heavy rain possible Radar. |
| TechTalk8060 | 2021-02-03. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; EQUIPMENT. Tech Talk discussion on cgw lost communication with cpc. |
| Techtalk7869 | 2021-02-03. Service bulletin. LATCHES/LOCKS/LINKAGES. Tech talk continued discussion on KEYLESS ENTRY FOB programming. |
| TechTalk8020 | 2021-02-02. Service bulletin. POWER TRAIN. Tech Talk discussion on LX6087 Rear axle oil change fluid type. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.