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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

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
TechTalk77272020-12-02. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; VISIBILITY; ELECTRICAL SYSTEM; EQUIPMENT. Tech Talk discussion on P4 NEW CASCADIA AUX HVAC BLOWER TURN ON
TechTalk70652020-12-02. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM. Tech Talk 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.
CALFTL54-0142020-12-01. Service bulletin. ELECTRICAL SYSTEM. Customer Advisory Letter for Dome Lamps Do Not Illuminate When the Right-Hand Door is Opened.
TechTalk77372020-11-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Tech Talk discussion on Diagnostic Link connection issues with D20M8.
TechTalk77582020-11-03. Service bulletin. ELECTRICAL SYSTEM. Tech Talk discussion for fuse 22 blowing.
TechTalk77862020-11-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; FORWARD COLLISION AVOIDANCE; LANE DEPARTURE. Tech Talk discussion on p4 gcw04t flashed to 19.45.1. Forward and lane camera not detected.
TechTalk77852020-11-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING. Tech Talk discussion on DL8 CGW connection issues for D20M8.
TechTalk77272020-11-03. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; ELECTRICAL SYSTEM. Tech Talk discussion on P4 NEW CASCADIA AUX HVAC BLOWER TURN ON.
SB54-2782020-10-28. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. 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 vehicle Powernet issues.
20TS-072020-10-21. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ENGINE AND ENGINE COOLING. 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.
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.
ICI20-0332020-10-19. Service bulletin. ELECTRICAL SYSTEM. Important Campaign Information Letter for SF576, SF610, & SF611 - Revised Bulletins. This letter is to inform you that revised bulletins for FOTA Field Service Campaigns SF576, SF610, and SF611 are available on DTNAConnect. Please print and use the revised bulletin for all work under SF576, SF610, & SF611 from this point forward. REVISION: The work instructions on all campaigns have been updated, a new campaign group with new parts were added to SF576 and an SRT was added to SF611.
SF611REV2020-10-19. Service bulletin. ELECTRICAL SYSTEM. Revised Field Service Campaign for Cascadia CTP Reset. Certain vehicles equipped with DTNA's proprietary Common Telematics Platform (CTP) are not communicating and, therefore, are unable to benefit from over-the-air software updates. The CTP will be reset and some will also be initialized.
SB54-3362020-10-12. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Updated Freightliner Service Bulletin for Rewiring the MPC2 Camera Fuse. This bulletin replaces the version dated 9/15/20. Information has been added about raising the system voltage to normal range to clear the "Lost Communication to MPC" code. The multipurpose camera 2 (MPC2) power is supplied via fuse 14 (F14) in New Cascadia vehicles built before August 24, 2020. With this configuration, fault code 232/524127/9 - "Lost Communication to MPC" becomes active during low voltage disconnect (LVD) situations when load shedding is required to maintain critical systems. These instructions provide the procedure for moving the MPC2 power supply from fuse 14 (F14) to fuse 35 (F35). Moving the MPC2 power supply requires the installation of a new etched vehicle power distribution module (VPDM) cover to document the new MPC2 location.
CALFTL54-0122020-10-01. Service bulletin. EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES. Customer Advisory Letter for New Cascadia 29A Battery Cable Relocation.
TechTalk77092020-10-01. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ENGINE AND ENGINE COOLING. Tech talk discussion on inaccurate reading DEF gauge.
TechTalk76762020-10-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Tech Talk discussion on new Cascadia P4 ICU issue for clearing codes after updating.
TechTalk71822020-09-30. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER. Tech Talk discussion on New Cascadia front blower motor inoperative.
TechTalk66092020-09-30. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE AND ENGINE COOLING. Tech Talk discussion on Optimized Idle batteries.
TechTalk48552020-09-30. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY; INTERIOR LIGHTING. Tech Talk discussion for P4 Next Gen Cascadia dome lights stay on while driving.
TechTalk45632020-09-25. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Tech Talk discussion for P4 New Cascadia ICU display blank but gauges still work.
TechTalk39822020-09-25. Service bulletin. ELECTRICAL SYSTEM; VEHICLE SPEED CONTROL:CRUISE CONTROL. Tech Talk discussion for new cascadia w/isx cruise issue. A truck with an cummins isx with onguard, driver complains onguard cuts out and the cruise control stops working,
CTP Letter2020-09-25. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. Customer Letter explaining for certain vehicles the software updates for the CTP will require monitoring and may affect service availability.
SS10346702020-09-24. Service bulletin. ELECTRICAL SYSTEM:IGNITION; ENGINE; EQUIPMENT. Service Solution for Fault Code VRDU 524127/9 - Lost Communication with the MPC. This Service Solution has been superseded to service bulletins SB 54-336 and 54-329. Please see the service bulletins for the most current information. VRDU fault code 524127/9 is often caused by lack of ignition supply to the MPC, which causes it to stop communicating. This usually occurs when voltage is low.
SB54-3362020-09-17. Service bulletin. ELECTRICAL SYSTEM. Freightliner Service Bulletin for Rewiring the MPC2 Camera Fuse. The multipurpose camera 2 (MPC2) power is supplied via fuse 14 (F14) in New Cascadia vehicles built before August 24, 2020. With this configuration, fault code 232/524127/9 - "Lost Communication to MPC" becomes active during low voltage disconnect (LVD) situations when load shedding is required to maintain critical systems. These instructions provide the procedure for moving the MPC2 power supply from fuse 14 (F14) to fuse 35 (F35). Moving the MPC2 power supply requires the installation of a new etched vehicle power distribution module (VPDM) cover to document the new MPC2 location.

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