2021 Freightliner Cascadia Technical Service Bulletins

509 technical service bulletins (TSBs) are on record for the 2021 Freightliner Cascadia. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10187839Feb 2, 2021Electrical system, Steering. Tech Talk discussion on Cascadia P4 No start.
• 10187599Feb 2, 2021Seat belts. Service Solution for New Cascadia Seat Belt Warning Harness Routing
• 10186572Feb 2, 2021Electrical system. Tech Talk continued discussion on P4 dome lights comin on while driving.
• 10187900Feb 1, 2021Engine cooling, Transmission and drivetrain. 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.
• 10187877Feb 1, 2021Visibility (wipers, defrost, mirrors). 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.
• 10186540Feb 1, 2021Visibility (wipers, defrost, mirrors). 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.
• 10186531Feb 1, 2021Engine cooling. Tech Talk discussion on Possible new regen strategy on GHG 17.
• 10186665Jan 29, 2021Engine cooling. Customer Advisory Letter for Gen 5 DD15 Proactive Turbocharger Replacement.
• 10186663Jan 25, 2021Brakes, Electrical system. Tech Talk continuing discussion on ABS trailer code 520216 31 P4 New Cascadia.
• 10185931Jan 25, 2021Engine cooling, Equipment. 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.
• 10185897Jan 25, 2021Engine cooling, Equipment. 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.
• 10185895Jan 25, 2021Equipment, Electrical system. 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.
• 10185690Jan 20, 2021Body and structure. Freightliner Service Bulletin for Replacement Cab Doors with Pre-Drilled Holes. Replacement doors for New Cascadia vehicles are now pre-drilled with two holes for the installation of turning vanes. If turning vanes are not installed, the pre-drilled holes need to be plugged with ratchet fasteners.
• 10185689Jan 20, 2021Transmission and drivetrain. Freightliner Service Bulletin for Updating the Programming of the Integrative Predictive Powertrain Control (IPPC) Module. The integrative predictive powertrain control (IPPC) module programming should be updated to the newest software. If the ignition short-cycles on these vehicles with the previous software, there is a risk that the IPPC module will not have time to write EEPROM data in the controller.
• 10185688Jan 20, 2021Engine cooling, Electrical system. Freightliner Service Bulletin for Coolant Level Sensor Wiring Repair. On New Cascadia vehicles, depending on the tension applied to the harness located at the coolant level sensor and its mounting locations, wiring damage can occur, resulting in one or more of the below listed fault codes.
• 10185896Jan 17, 2021Equipment, Engine cooling. 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…
• 10186612Jan 16, 2021Visibility (wipers, defrost, mirrors). Tech Talk continued discussion on Parksmart Fan Control
• 10186608Jan 14, 2021Visibility (wipers, defrost, mirrors). Tech Talk discussion on Cab vent temperatures.
• 10186542Jan 7, 2021Engine cooling. Tech Talk discussion on oil filter.
• 10186541Jan 6, 2021Forward collision avoidance, Lane departure. Tech Talk discussion on P4 radar issue.
• 10186538Jan 6, 2021Equipment. Tech Talk discussion on DO NEW CASCADIA TURN SIGNAL SWITCHES RETURN TO ORIGINAL POSITION.
• 10186537Jan 6, 2021Equipment. Tech Talk discussion on radio wont turn on with the key but only push button.
• 10185899Jan 5, 2021Engine 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.
• 10184932Dec 29, 2020Equipment. Tech Talk discussion on radio wont turn on with the key but only push button.
• 10184897Dec 29, 2020Visibility (wipers, defrost, mirrors). 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.
• 10184869Dec 29, 2020Visibility (wipers, defrost, mirrors), Equipment. Freightliner Service Bulletin for Front HVAC Evaporator Freezing and Espar Heater Cool Down Algorithm. New Cascadia vehicles with sleeper cabs may become extremely cold when in A/C mode, which can lead to reduced airflow as a result of internal ice buildup at the evaporator. Durability of the Espar D5 heater system when paired with the battery parked HVAC system (BPHS) can be improved by applying "cool down"…
• 10184785Dec 23, 2020Transmission and drivetrain. 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.
• 10184895Dec 22, 2020Brakes. Tech Talk discussion on New Cascadia "low air pressure" warning light.
• 10184922Dec 20, 2020Electrical system. Tech Talk discussion on P4 Dome lights coming on while driving.
• 10184920Dec 17, 2020Visibility (wipers, defrost, mirrors). Tech Talk discussion on rookie mirror falling out.
• 10184902Dec 17, 2020Visibility (wipers, defrost, mirrors), Engine cooling. Tech Talk continued discussion on 2021 Cascadia opt idle issues.
• 10184655Dec 17, 2020Brakes. Freightliner Service Bulletin for Access to Front Brake Zerk Fittings. Certain vehicles with Detroit front axles and Meritor EX-L front air disc brakes do not have access to the front brake zerk fittings for lubrication.
• 10184872Dec 14, 2020Electrical system. Service Solution for flickering overhead reading light during slight movement of the steering wheel for New Cascadia with DR 40SI alternators, possibly other alternators as well. The flickering overhead light is considered a nuisance, and can be simply eliminated by either adding an accessory to one of the power receptacles, or running an additional ground in one of the sleeper bunk lamps to suppress the ripples on…
• 10184035Dec 11, 2020Equipment. Service Bulletin for Pana-Pacific DEA505 Radio Reprogramming. On right-hand drive New Cascadia vehicles built before September 28, 2020, incompatible radio software can cause the Pana-Pacific DEA505 radios (A22-76228-000) to send the Bluetooth audio to the left-hand door speaker.
• 10184033Dec 11, 2020Equipment, Body and structure. Service Bulletin for Retrofit of One-Piece to Two-Piece Auxiliary Dash Panel.
• 10184917Dec 8, 2020Electrical system, Brakes. Tech Talk discussion on 2021 p4 jyst brakes drag alarm on all the time.
• 10184029Dec 8, 2020Steering, Transmission and drivetrain. 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.
• 10183988Dec 7, 2020Equipment, Transmission and drivetrain, Steering. 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.
• 10183733Dec 6, 2020Engine cooling. Technical Service Letter for SPN 3711 FMI 31 on GHG17 DD15 Trucks.
• 10183954Nov 30, 2020Equipment, Engine cooling, Fuel system. Special Publication letter for Two-Filter Fuel System KM59 GEN1 DD15 DD16 Severe Duty High Pressure Fuel Rail Feed Lines Service Kit.
• 10183442Nov 25, 2020Brakes, Electrical system. Tech Talk discussion on ABS trailer code 520216 31 P4 New Cascadia.
• 10182886Nov 20, 2020Fuel system. Detroit Connect Customer Communication for vehicle trips not populating in the Vehicle History Trips page. This may affect Fleet Fuel Analysis and Fuel Economy Calculations.
• 10183449Nov 9, 2020Exterior lighting, Electrical system, Equipment. Tech Talk discussion on SS1034348 P4 unintended flasher.
• 10183322Nov 5, 2020Electrical system. Customer Advisory Letter for Dome Lamps Do Not Illuminate When the Right-Hand Door is Opened.
• 10181759Oct 27, 2020Electrical system, Equipment. Updated Freightliner Service Bulletin for Powernet Troubleshooting Guide - Batteries, Path, Alternator, and Starter. This bulletin replaces the version dated 5/31/2017. Information is added about the BCT-460DTNA PowerNet Assessment Tool. When troubleshooting Powernet issues, use the BCT-460DTNA PowerNet Assessment Tool. As of May 29, 2018, the AutoMeter® is the only Daimler-approved tool for troubleshooting…
• 10182012Oct 20, 2020Engine cooling, Electrical system. Tech Talk discussion on DL8 CGW connection issues for D20M8.
• 10181369Oct 20, 2020Transmission and drivetrain, Engine cooling, Electrical system. 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…
• 10181368Oct 20, 2020Transmission and drivetrain, Electrical system. 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.
• 10182022Oct 17, 2020Suspension. Tech Talk discussion on Suspension Pressure Gauge.
• 10181322Oct 16, 2020Engine cooling. Freightliner Service Bulletin for Air Cleaner Support Bracket Bolt Replacement. On New Cascadia vehicles, the air filter housing rear mounting bracket bolts may be found to be loose or missing. If allowed to continue, this can lead to complete bolt failure which will allow the filter housing to rest on and possibly wear through the valve cover.

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