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Service bulletins for the 2019 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.

771 on file from NHTSA, as of 2026-10-19.

By type

By component

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
FTLCAE182-20172021-05-17. Service bulletin. POWER TRAIN; EQUIPMENT. New DT12 Transmission for Original Cascadia
FTLCAE173-20172021-05-17. Service bulletin. EQUIPMENT; POWER TRAIN. Air-to-Oil Coolers for DT12 in New Cascadia
FTLCAE172-20172021-05-17. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION; EQUIPMENT. New Accuride Aluminum Wheels
SS3075-FTL20212021-05-01. Service bulletin. POWER TRAIN. Service Solution for FTL DT12 Trans Control Harness Chaffing - PT Can faults. Transmission will not shift into Gear while driving or will not start and trigger multiple PT CAN Fault Codes.
D21M12021-05-01. Service bulletin. POWER TRAIN. Detroit Field Service Campaign for DT12 Transmission Drive Shaft Cover Plug Reseal. Daimler Trucks North America LLC, on behalf of its DETROIT Powertrain Division, is initiating Field Service Campaign D21M1 on certain DT12 transmissions in order to reseal the bypass plugs of the drive shaft cover located in front housing.
DT12 Trans Chafe2021-04-08. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; POWER TRAIN. DTNA received a field notification on multiple units regarding diagnostic fault codes that were found to be causing issues to the After Treatment Control Module (ACM). These fault codes indicated that the ACM communication message was not received by the Motor Control Module (MCM) which in certain cases, led to a 25% engine de-rate situation. Further diagnosis revealed that the DT12 wiring harness was chafing and contacting the transmission TCU case. To reduce potential chafing areas, the proposed short-term containment was to route the wiring harness using additional tie straps. This communication applies to Freightliner and Western Star vehicles built with DT12 transmissions.
D21M32021-03-31. Service bulletin. POWER TRAIN. Detroit Field Service Campaign for DT12 Gear Grind During Downshift Software Update.
WI21-0042021-03-02. 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.
TechTalk58272021-02-04. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN; ENGINE AND ENGINE COOLING. Tech Talk discussion on P4 No crank intermittent *RESOLVED*.
SB35-0362020-12-30. Service bulletin. POWER TRAIN. Revised Freightliner Service Bulletin for Axle Flange Gasket Replaced with O-Ring. Revision removed steps instructing removal and installation of wheels. Daimler Trucks North America has released a new axle shaft to hub rubber O-ring (part number 11-30728-000) as a replacement for the paper gasket (part number 11-14418-000). The new O-ring will provide better sealing and is reusable. It is quicker and easier to use compared to the paper gasket, because using a paper gasket requires cleaning the hub when the axle shaft is removed.
WP20-018R2020-12-12. Service bulletin. STEERING; POWER TRAIN. Revised Warranty Policy Letter for Alliance/Mascot Aftermarket Warranty and Claim Filing. Revisions are in blue. With Mascot now in partnership with Detroit Reman and Alliance Parts, DTNA is pleased to announce that Mascot coverage has been added to OWL. Remanufactured Alliance/Mascot parts include transmission, differential, steering gear, and steering pump used in an on-highway vehicle applications. The Alliance/Mascot aftermarket warranty coverage period has not changed: depending on the part, coverage is for one (1) or two (2) years and current parts, labor, and reimbursement policies apply.
WP20-0182020-12-12. Service bulletin. STEERING; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; POWER TRAIN. Warranty Policy Letter for Alliance/Mascot Aftermarket Warranty and Claim Filing. With Mascot now in partnership with Detroit Reman and Alliance Parts, DTNA is pleased to announce that Mascot coverage has been added to OWL. Remanufactured Alliance/Mascot parts include transmission, differential, steering gear, and steering pump used in an on-highway vehicle applications. The Alliance/Mascot aftermarket warranty coverage period has not changed: depending on the part, coverage is for one (1) or two (2) years and current parts, labor, and reimbursement policies apply.
SB26-0522020-12-07. Service bulletin. POWER TRAIN. Revised Service Bulletin for DT12 PTO Upfit. This bulletin replaces the version dated 09/13/2019. DDCSN and Power Service Literature references have been removed.
TechTalk78972020-12-03. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION. Tech Talk discussion on New Cascadia no regeneration.
17TS-05REV22020-10-21. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. Revised Technical Service Letter for Detroit DT12 TCM GHG17 Only; Bootloader Update. On Detroit DT12 equipped vehicles, it may be necessary to complete an additional step in the programming process when updating the TCM software.
SB35-0362020-10-12. Service bulletin. EQUIPMENT; POWER TRAIN. Freightliner Service Bulletin for Axle Flange Gasket Replaced with O-Ring. Daimler Trucks North America has released a new axle shaft to hub rubber O-ring (part number 11-30728-000) as a replacement for the paper gasket (part number 11-14418-000). The new O-ring will provide better sealing and is reusable. It is quicker and easier to use compared to the paper gasket, because using a paper gasket requires cleaning the hub when the axle shaft is removed.
TechTalk76912020-10-02. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. Tech Talk discussion about Common Powertrain Controller(CPC) not configured to Cascadia
TechTalk76742020-10-01. Service bulletin. POWER TRAIN. Tech Talk discussion on P4 DT12 grinds when shifting into lower gears.
SB26-0512020-08-29. Service bulletin. POWER TRAIN; EQUIPMENT. Updated Service Bulletin for DT12 Transmission Cooler Retrofit. This bulletin replaces the version dated 09/18/2019. The part number for the oil control valve has been updated in the parts table.
SS10346862020-04-09. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. Service Solution for P4 New Cascadia with Manual Transmissions Does Not Use Bottom Of Clutch Switch For Starting. On the prior P3 Legacy Cascadia vehicles with manual transmission, the Bottom of Clutch (BOC) switch could be uses as an interlock for the engine crank circuit. If programmed in the SAM Cab, the engine crank circuit would require the clutch to be fully depressed in order for the engine to crank. P3 also offered a neutral switch as an interlock that could be used instead of the BOC and would require the transmission to be neutral in order for the engine to crank. P4 New Cascadia only offers the neutral switch as the interlock for engine crank.
CALStrAxleSprFas2020-01-19. Service bulletin. SUSPENSION; POWER TRAIN. Customer Advisory Letter to communicate that an inspection be performed for certain New Cascadia. The inspection is for the steer axle spring to front hanger fastener.
SB35-0342019-09-28. Service bulletin. POWER TRAIN. Service Bulletin for Hub Oil Level in Final Drive (NFD) Top Performance Axles on Decked Vehicles
SB26-0522019-09-27. Service bulletin. POWER TRAIN. Service Bulletin for DT12 PTO Upfit
SB26-0512019-09-27. Service bulletin. POWER TRAIN. Service Bulletin for DT12 Transmission Cooler Retrofit
19TL-142019-09-09. Service bulletin. POWER TRAIN; EQUIPMENT. Tool Letter for New Final Drive Driver Controlled Differential Lock Spring Compressor. These new axles require a new tool to compress the Driver Controlled Differential Lock (DCDL) spring. To remove and install the DCDL spring, the tool DSN0FDA17001 is needed.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.