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
| CALFTL54-015 | 2021-03-26. Service bulletin. ELECTRICAL SYSTEM. Customer Advisory Letter for Disabling the Park Brake Drag ICU Warning Message. |
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| CALFTL49-002 | 2021-03-26. Service bulletin. ENGINE AND ENGINE COOLING. Customer Advisory Letter for Adding Exhaust Shim to ATS Exhaust Outlet and Replacing Exhaust Elbow and Clamp. An undersized ATS outlet pipe was installed on these vehicles, causing the exhaust clamp used to fasten the exhaust elbow to not clamp securely. |
| CALFTL47-001 | 2021-03-26. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, DIESEL. Customer Advisory Letter for Correction of Low Pressure Fuel Lines Installation to Ensure Proper Clearance. |
| CALFTL54-010REV3 | 2021-03-26. Service bulletin. SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT. Revised Customer Advisory Letter for ABS Warning Light Illumination with ABS code SA 11, SPN 629, FMI 11. REVISED: This CAL revises the CAL issued August 10th, 2020. Western Star 49X vehicles have been added to the CAL scope and instructions for downloading and installing software to address the ABS warning light illumination with ABS code SA 11, SPN 629, FMI 11 have replaced the corrective action of the previous CAL. |
| SB83-155 | 2021-03-26. Service bulletin. EQUIPMENT. Updated Freightliner Service Bulletin for Espar Service Information. This bulletin replaces the version dated January 1, 2015. New Cascadia has been added to the model list. |
| SS3071FTL2021 | 2021-03-25. Service bulletin. ELECTRICAL SYSTEM. Service Solution for New Cascadia Maintenance Indicator Issues. Some customers have reported incorrect or undesired pop up messages occurring in the ICC5 display and have requested field correction. |
| SS3070FTL2021 | 2021-03-25. Service bulletin. ELECTRICAL SYSTEM; LANE DEPARTURE. Service Solution for P4 New Cascadia Side Guard Radar Harness Moisture Intrusion. The 6-pin connector located at the side radar can show signs of water intrusion if wires are strained at the connector. Wires without strain relief can allow water to intrude past the seals, resulting in corrosion on the terminals and pins within the connector. Active fault codes for lost communication with RDU and SRRM, plus other codes for CPC, CGW and ABS. |
| SB54-341 | 2021-03-25. Service bulletin. WHEELS; ELECTRICAL SYSTEM. Updated Freightliner Service Bulletin for Tire Pressure Monitoring System (TPMS) Water Intrusion. This bulletin replaces the bulletin dated 02/08/2021. The location for the date stamp has changed. A note has been added to Fig. 2. |
| SB54-338 | 2021-03-24. Service bulletin. VISIBILITY; EQUIPMENT. Revised Freightliner Service Bulletin for Updating HVAC ECU Software to Fix Front HVAC Evaporator Freezing and Improve Espar Heater Cool Down. This bulletin replaces the version dated 12/23/2020. Information has been added about ParkSmart units and the instructions have been streamlined. |
| SB54-305 | 2021-03-24. Service bulletin. EQUIPMENT. Revised Freightliner Service Bulletin for New Cascadia Key Fob ID Retention. This bulletin replaces the version dated 8/15/2018. The guidance for locating the serial number for key fobs has changed. It is no longer necessary to document the serial number in PartsPro. |
| SB49-038 | 2021-03-24. Service bulletin. ENGINE AND ENGINE COOLING. Revised Freightliner Service Bulletin for netized Fill Neck for Six-Gallon DEF Tanks. A design change removed the magnets from the fill necks for some 6-gallon diesel exhaust fluid (DEF) tanks. If the vehicle is equipped with a non-magnetic fill neck 04-32529-000, it can be updated to a magnetic neck 04-32529-001. This bulletin replaces the version dated 04/18/2017. Updated availability of magnetic fill neck option for other diesel exhaust fluid (DEF) tank part numbers. |
| WP21-007 | 2021-03-24. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Warranty Policy Letter for battery tags. DTNA determined that since adopting the AutoMeter BCT-460DTNA Powernet Assessment Tool (AutoMeter) as the required powernet system tester, not all battery tags have to be retained support Warranty-related claims. |
| TechTalk8126 | 2021-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on D20M8 having updates greater than Recall requires in server. |
| TechTalk8142 | 2021-03-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Tech Talk discussion on Radio issue while in AM mode and inverter on. |
| TechTalk8152 | 2021-03-03. Service bulletin. SERVICE BRAKES, AIR. Tech Talk discussion on New Cascadia Air Dryer Small Purges. |
| TechTalk8124 | 2021-03-03. Service bulletin. ELECTRICAL SYSTEM. Tech Talk discussion on Fault Code Information Missing. |
| 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. |
| TechTalk8103 | 2021-03-02. Service bulletin. ELECTRICAL SYSTEM; STEERING. Tech Talk discussion on Cascadia P4 No start. |
| 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. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.