2020 Freightliner Business Class M2 Technical Service Bulletins

254 technical service bulletins (TSBs) are on record for the 2020 Freightliner Business Class M2. 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.

• 10189320Mar 16, 2021Engine 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…
• 10188340Feb 26, 2021Fuel system. Email from DDC Service Engineering regarding a fuel pump replacement on a population of 18 MY2019-2021 Freightliner M2 vehicles.
• 10187532Feb 25, 2021Equipment, Engine cooling. Freightliner Service Bulletin for Programming Chassis Electronic Control Units (ECUs) With DiagnosticLink.
• 10188227Feb 19, 2021Fuel system. Tech Talk discussion on KUS fuel sending units.
• 10187835Feb 19, 2021Engine 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.
• 10187834Feb 19, 2021Engine cooling. Revised Technical Service Letter for Fault Code SPN 2629 FMI 10 on GHG21 936.917 DD8 Dual Stage Turbo with MCM Software Version 14.
• 10187444Feb 15, 2021Engine cooling, Electrical system, Equipment. Warranty Information Letter for Detroit NOx Sensor Circuit Fault Codes - Claim Guidelines.
• 10187443Feb 15, 2021Equipment. Warranty Information Letter for Body Builder/Truck Equipment Manufacturer Demonstration Program.
• 10188124Feb 11, 2021Electrical system. Tech Talk discussion on 2020 M2 106 J1939 ISSUES.
• 10187944Feb 10, 2021Engine cooling. Tech Talk continued discussion on NEW M2 DD8 TURBO OUTLET TEMP SENSOR.
• 10187440Feb 8, 2021Equipment. Revised Warranty Information Letter for OWL and Warranty Manual Improvement: Sublets and Travel Time/Distance. In the spirit of continuous improvement, DTNA reviewed sublet-related policies and procedures. The goal was to improve language clarity and optimize processes. Revisions are in blue font.
• 10187843Feb 2, 2021Electrical system, Electronic stability control. Tech Talk continued discussion on WABCO ABS SYSTEM.
• 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.
• 10186630Jan 16, 2021Electronic stability control, Electrical system. Tech talk continued discussion on WABCO ABS SYSTEM.
• 10185898Jan 15, 2021Equipment, Body and structure. Customer Advisory Letter for Freightliner M2 Forward-Frame Extension Hood Mount Bracket Gusset Installation.
• 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.
• 10184898Dec 18, 2020Engine cooling. Tech Talk discussion on M2 DD8 TURBO OUTLET TEMP SENSOR.
• 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.
• 10184918Dec 9, 2020Electronic stability control, Electrical system. Tech Talk discussion on WABCO ABS SYSTEM.
• 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.
• 10183732Dec 6, 2020Engine cooling. Technical Service Letter for Fault Code SPN 2629 FMI 10 on GHG21 936.917 DD8 Dual Stage Turbo with MCM Software Version 14
• 10184030Dec 2, 2020Suspension, Equipment. Revised Customer Advisory Letter for Hendrickson Primaax EX 69,000 lb Tri-Axle Rear Air Suspension Height-Control Valve Relocation. Revision is Step 8 drilling instructions expanded. The attached document provides work instructions for relocating the height-control valve downward 1.62 inches (41.3 mm) to prevent the linkage from protruding above the top flange of the frame when the suspension air is dumped.
• 10183439Nov 12, 2020Electrical system. Tech Talk discussion on M2 repeatedly burning F19 fuse.
• 10183321Nov 4, 2020Electrical system. Customer Advisory Letter for Updating the RP170 Customer Access Connector and Adding Overlays for J1939. The Electrical Guide for M2106, M2112, 108SD, 114SD Body Builder Reference Guide Revision: D June 2019 incorrectly displays pins 2 and 3 of the customer access 8 pin connector on table 5 as Hot with crank, Ignition controlled battery (+) thru Disconnect switch (If disconnect switch specified).
• 10181942Oct 30, 2020Engine cooling, Equipment, Electrical system. Service Solution for M2,108SD, 114SD Coolant Level Sensor P/N 06-93316-002. The Call Center has received several calls pertaining to this LCL sensor introduced to in 2018. The purpose of this solution is to bring better awareness to the sensor functions, fault codes generated, along with providing testing procedures used to validate the sensors condition.
• 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…
• 10182135Oct 26, 2020Electrical system, Equipment. Tech Talk discussion on P4 bunk blower on low all the time after software updates.
• 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.
• 10181943Oct 14, 2020Electrical system, Engine cooling. Tech Talk discussion on Cummins fault 4769. DEF tank level sensor fault.
• 10181052Oct 12, 2020Engine cooling, Equipment. 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.
• 10181049Oct 7, 2020Transmission and drivetrain, Equipment. 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…
• 10180517Sep 30, 2020Engine cooling. 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.
• 10180503Sep 29, 2020Engine 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.
• 10180152Sep 23, 2020Engine cooling, Equipment. Revised Customer Advisory Letter for Fan Hub Fastener Inspection in Business Class M2 Vehicles with DD5 Engines. The revision has updated inspection procedures. DTNA has determined that some GHG17 Detroit DD5 engines will need to have the fan hub bolts inspected for correct torque.
• 10180350Sep 22, 2020Equipment, Steering. Tech Talk discussion about power steering fluid.
• 10180064Sep 16, 2020Equipment, Engine cooling, Engine. Customer Advisory Letter for Fan Hub Fastener Inspection in Business Class M2 Vehicles with DD5 Engines. DTNA has determined that some GHG17 Detroit DD5 engines will need to have the fan hub bolts inspected for correct torque.
• 10180423Sep 15, 2020Equipment, Electrical system. Tech Talk discussion on M-2 gauges inoperative at times.
• 10180382Sep 15, 2020Engine cooling. Tech Talk discussion on repair verification for codes like 'low air flow' when a trailer is not available.
• 10180137Sep 11, 2020Body and structure, Visibility (wipers, defrost, mirrors). Tech Talk Discussion for M2 mirror shake. Vehicle has excessive mirror shake going down the road.
• 10179249Aug 31, 2020Engine cooling, Electrical system, Equipment. Customer Service Announcement for Release of DiagnosticLink 8.12 Service Pack 2. On Thursday, September 3, 2020, Service Pack (SP) 2 for DiagnosticLink 8.12 Standard and Professional will be made available to download from the Detroit Diesel server.
• 10179062Aug 17, 2020Suspension, Equipment. Customer Advisory Letter for Hendrickson Primaax EX 69,000 lb Tri-Axle Rear Air Suspension Height-Control Valve Relocation. The attached document provides work instructions for relocating the height-control valve downward 1.62 inches (41.3 mm) to prevent the linkage from protruding above the top flange of the frame when the suspension air is dumped.
• 10178945Aug 11, 2020Equipment. Revised letter is to announce a reimbursement available to dealers for travel to a customer's location to perform a recall or field service campaign. Potential travel reimbursement applies to DTNA truck dealers and Detroit Diesel distributors. Thomas Built Buses will be addressed separately.
• 10179108Aug 7, 2020Transmission and drivetrain, Equipment. Service Bulletin for Powertrain PDM and Main PDM Bracket Modification. This bulletin replaces the version dated 10/31/2019. The build date section has been added.
• 10178206Aug 7, 2020Exterior lighting, Electrical system, Equipment. Important Campaign Information letter announcing that SF605 for LED Step Lighting has been suspended. It has been determined that a change in the procedure is necessary. A second Important Campaign Information letter will be posted when the changes have been made and the campaign is reactivated.
• 10178006Aug 3, 2020Equipment. Important Campaign Information letter announcing Dealer Travel for Campaign Performance. This letter is to announce a reimbursement available to dealers for travel to a customer’s location to perform a recall or field service campaign.
• 10177979Aug 3, 2020Equipment. Warranty Information Letter for OWL and Warranty Manual Improvement: Sublets and Travel Time/Distance. In the spirit of continuous improvement, DTNA reviewed sublet-related policies and procedures. The goal was to improve language clarity and optimize processes.
• 10177838Aug 3, 2020Equipment. Warranty Information Letter informing that to ensure that DTNA policies and service network practices align, the Warranty Department will be revising the Warranty Manual.
• 10177604Jul 28, 2020Equipment, Suspension. Freightliner Service Bulletin for Non-Airliner Rear Suspension Crossmember Fastener Change. With the start of production on March 2, 2020, the fasteners used to assemble the non-Airliner rear suspension (bogie) crossmember have changed. The rear suspension bogie crossmember gussets to the C-channel will be assembled with 5/8 - 18 fasteners. This change includes a revision to a higher friction nut that requires an…
• 10177692Jul 27, 2020Engine cooling. Technical Service Letter for EPA10, GHG14, GHG17 Diesel Particulate Filter (DPF) Compatibility. Note: This document supersedes 14 TS-25 and 15 TS-8. Detroit Diesel has determined that some, Diesel Particulate Filters (DPFs) are compatible in pairs and or can be mixed together within EPA10 and GHG14 Systems. For 1-BOX and Two-Box Configuration Aftertreatment Systems (ATS), this is only possible when the filters are…

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