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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: Engine are shown. Show all

Bulletins, newest first
18SP7442020-12-08. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:FUEL RAIL. Special Publication letter for Two-Filter Fuel System KM59 GEN1 DD15 DD16 Severe Duty High Pressure Fuel Rail Feed Lines Service Kit.
20TS-092020-12-07. Service bulletin. ENGINE AND ENGINE COOLING. Technical Service Letter for SPN 3711 FMI 31 on GHG17 DD15 Trucks.
TechTalk78502020-12-04. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Tech Talk discussion on P4 ACM Not Communicating.
TechTalk71942020-12-04. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. Tech Talk discussion on DD15 making ticking noises.
TechTalk78882020-12-03. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on Low coolant sensor New Cascadia.
D20M22020-11-04. Service bulletin. POWER TRAIN; EQUIPMENT; ENGINE AND ENGINE COOLING. Detroit Diesel Field Service Campaign for DETROIT TM2020 Transmission Replacement. It has been discovered that certain TM2020 units have porosity issues in and around the oil cooler line fittings on the center housing.
TechTalk77522020-11-03. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on fault codes SPN 1322 FMI 11 and SPN 1324 FMI 10 on engine cylinder misfires.
TechTalk77852020-11-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING. Tech Talk discussion on DL8 CGW connection issues for D20M8.
TechTalk77502020-11-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE AND ENGINE COOLING. Tech Talk discussion on DETROIT D20M8 ASM DELETED.
TechTalk77352020-11-03. Service bulletin. FUEL SYSTEM, OTHER; ENGINE AND ENGINE COOLING. Tech Talk discussion on 1 Aftertreatment System Problem Detected.
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.
CALFTL60-0032020-10-19. Service bulletin. STRUCTURE; ENGINE AND ENGINE COOLING. Customer Advisory Letter for New Cascadia Cummins ISX12N Natural Gas Cab Mount Heat Shield Installation.
SB09-0382020-10-19. Service bulletin. ENGINE AND ENGINE 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.
20TS-062020-10-13. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING. DDC Technical Service Letter for GHG17 DD Platform Heavy Duty Oil Pan Drain Plug Inserts. Some GHG17 DD Platform Heavy Duty oil pans may experience an issue with the oil pan drain plug insert spinning during removal or installation while completing an oil change. Leaking may also be observed at the drain plug and/or other plugs in the oil pan.
TechTalk76912020-10-02. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. Tech Talk discussion about Common Powertrain Controller(CPC) not configured to Cascadia
18SP7362020-10-01. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS; ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. Detroit Diesel Special Publication informing about Heavy Duty Friction Style Belt Tensioner Kit. This heavy duty friction style belt tensioner kit contains the belt tensioner and two M10 bolts to correctly pin the friction style belt tensioner. The M10x80mm bolt is used to pin the engine cooling fan drive arm. The M10x50mm bolt is used to pin the engine accessory drive arm.
20TS-03REV22020-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Revised Technical Service Letter for DD Heavy Duty Platform Belt Tensioner Change. A newly designed, dual-arm friction shoe damping tensioner was implemented for the DD Heavy Duty Platform. The revision includes additional information on retrofit and service kits.
TechTalk77352020-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on Aftertreatment System Problem Detected after performing D20M8 recall.
TechTalk77092020-10-01. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ENGINE AND ENGINE COOLING. Tech talk discussion on inaccurate reading DEF gauge.
TechTalk76872020-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Tech talk discussion on DEF gauge not reading properly.
TechTalk76792020-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on repair verification for codes like 'low air flow' when a trailer is not available.
TechTalk76442020-09-30. Service bulletin. ENGINE AND ENGINE COOLING. Tech Talk discussion on Possible new regen strategy on GHG 17.
TechTalk66092020-09-30. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE AND ENGINE COOLING. Tech Talk discussion on Optimized Idle batteries.
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.
SF6072020-09-17. Service bulletin. ENGINE AND ENGINE COOLING. Field Service Campaign for Freightliner Cascadia LG1 Radiator Inlet Hoses. The radiator and upper hose assembly have an alternate design available which may extend the life of the radiator hose and prevent leaking connectors.

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