IllustrationThe DEF header failed on this truck and it causes the vehicle to be disabled. The DEF header is an emissions part. PART NUMBER 04-31354-004 HEADER-SSI,CONC,6 BOLT,CMNS
2020 Freightliner Business Class M2
Owner reports · Recalls · Investigations
Limited comparison data
There is not enough comparable history to draw a useful model-year comparison.
About this comparison →How this year compares
Owner complaints by model year
Compare all Business Class M2 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
Limited mileage data: 0 of 8 reports include usable mileage. There isn’t enough coverage to show a useful chart.
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
NHTSA owner reports · September 18, 2026 snapshot.
0 crash reports0 fire reports0 injury reports
What owners actually said
8 reportsThe DEF header failed on this truck and it causes the vehicle to be disabled. The DEF header is an emissions part. PART NUMBER 04-31354-004 HEADER-SSI,CONC,6 BOLT,CMNS
The DEF header failed on this truck and it causes the vehicle to be disabled. The DEF header is an emissions part. PART NUMBER 04-31354-004 HEADER-SSI,CONC,6 BOLT,CMNS
The DEF header failed on this truck and it causes the vehicle to be disabled. The DEF header is an emissions part. PART NUMBER 04-31354-004 HEADER-SSI,CONC,6 BOLT,CMNS
The DEF header failed on this truck and it causes the vehicle to be disabled. The DEF header is an emissions part. PART NUMBER 04-31354-004 HEADER-SSI,CONC,6 BOLT,CMNS
The DEF header failed on this truck and it causes the vehicle to be disabled. The DEF header is an emissions part. PART NUMBER 04-31354-004 HEADER-SSI,CONC,6 BOLT,CMNS
The DEF header failed on this truck and it causes the vehicle to be disabled. The DEF header is an emissions part. PART NUMBER 04-31354-004 HEADER-SSI,CONC,6 BOLT,CMNS
Attached to this is the federal certification label for an Ultra Liner 45 built on the Freightliner chassis. Executive Coach Builders is building this bus, National Bus Sales is selling this bus to schools in Oklahoma and Texas. The states have allowed that, but as an OEM that goes against what is currently allowed.
Official recalls
1225V760000 · Suspension:critical Fasteners
Nov 4, 2025
Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2026 Western Star 49X, Freightliner Business Class M2, Freightliner 114SD, Freightliner 108SD, 2021-2026 Western Star 47X, 2021-2023 Freightliner 122SD, 2022 Western Star 48X, and 2023 Western Star 4700 vehicles. The axle clamp fasteners may be loose, which can result in a loss of vehicle control.
Consequence & remedy
Consequence: A loss of vehicle control increases the risk of a crash.
Remedy: Dealers will inspect and tighten the fasteners, as necessary, free of charge. Owner notification letters were mailed December 29, 2025. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is F1027.
24V924000 · Engine And Engine Cooling:engine:engine Control Module (ecu/ecm):software
Dec 11, 2024
Daimler Trucks North America, LLC (DTNA) is recalling certain 2015-2020 Freightliner Business Class M2 emergency vehicles equipped with certain Cummins diesel engines. The engine protection and inducement software may cause the engine to shut down unexpectedly.
Consequence & remedy
Consequence: An unexpected engine shutdown can delay emergency responders and increase the risk of injury.
Remedy: Cummins will update the electronic control module software and install a corrected data plate, free of charge. Owner notification letters were mailed February 5, 2025. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is F1012.
22V919000 · Tires; Wheels:rim
Dec 12, 2022
Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2023 Freightliner 114SD, 2023 Freightliner 122SD, 2020 Western Star 4700, 2019-2022 Western Star 4900, 2019-2023 Freightliner Business Class M2, and 2021 Freightliner Cascadia vehicles. The vehicles are equipped with tires that are not compatible with their 8.25-inch rims. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 120, "Wheels and Rims-Other Than Passenger Cars."
Consequence & remedy
Consequence: Driving with tires that are not compatible with their rims can reduce tire performance, increasing the risk of a crash.
Remedy: Dealers will replace the tires, free of charge. Owner notification letters were mailed June 2, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-962.
Additional source detail variants (2)
Tires
Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2023 Freightliner 114SD, 2023 Freightliner 122SD, 2020 Western Star 4700, 2019-2022 Western Star 4900, 2019-2023 Freightliner Business Class M2, and 2021 Freightliner Cascadia vehicles. The vehicles are equipped with tires that are not compatible with their 8.25-inch rims. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 120, "Wheels and Rims-Other Than Passenger Cars."
Consequence: Driving with tires that are not compatible with their rims can reduce tire performance, increasing the risk of a crash.
Remedy: Dealers will replace the tires, free of charge. Owner notification letters were mailed June 2, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-962.
Wheels:rim
Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2023 Freightliner 114SD, 2023 Freightliner 122SD, 2020 Western Star 4700, 2019-2022 Western Star 4900, 2019-2023 Freightliner Business Class M2, and 2021 Freightliner Cascadia vehicles. The vehicles are equipped with tires that are not compatible with their 8.25-inch rims. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 120, "Wheels and Rims-Other Than Passenger Cars."
Consequence: Driving with tires that are not compatible with their rims can reduce tire performance, increasing the risk of a crash.
Remedy: Dealers will replace the tires, free of charge. Owner notification letters were mailed June 2, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-962.
22V817000 · Forward Collision Avoidance: Adaptive Cruise Control; Service Brakes, Air:antilock:modulator
Nov 1, 2022
Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2023 Freightliner Cascadia, 2020-2022 Freightliner Business Class M2, and 2022 Freightliner 114SD, and 2020-2023 Western Star 49X, 2021-2023 Western Star 47X, and 2021-2022 Western Star 57X vehicles. The brake modulator valves on the front axle may corrode and cause the vehicle to pull to the affected side during an Adaptive Cruise Control (ACC) braking event.
Consequence & remedy
Consequence: Brakes that pull to one side during an ACC braking event may cause a sudden change in vehicle direction, increasing the risk of a crash.
Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 16, 2023. DTNA's number for this recall is FL-958. This recall expands and replaces previous recall 20V-390. All vehicles previously repaired under recall 20V-390 will need to have the new remedy performed.
Additional source detail variants (2)
Service Brakes, Air:antilock:modulator
Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2023 Freightliner Cascadia, 2020-2022 Freightliner Business Class M2, and 2022 Freightliner 114SD, and 2020-2023 Western Star 49X, 2021-2023 Western Star 47X, and 2021-2022 Western Star 57X vehicles. The brake modulator valves on the front axle may corrode and cause the vehicle to pull to the affected side during an Adaptive Cruise Control (ACC) braking event.
Consequence: Brakes that pull to one side during an ACC braking event may cause a sudden change in vehicle direction, increasing the risk of a crash.
Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 16, 2023. DTNA's number for this recall is FL-958. This recall expands and replaces previous recall 20V-390. All vehicles previously repaired under recall 20V-390 will need to have the new remedy performed.
Forward Collision Avoidance: Adaptive Cruise Control
Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2023 Freightliner Cascadia, 2020-2022 Freightliner Business Class M2, and 2022 Freightliner 114SD, and 2020-2023 Western Star 49X, 2021-2023 Western Star 47X, and 2021-2022 Western Star 57X vehicles. The brake modulator valves on the front axle may corrode and cause the vehicle to pull to the affected side during an Adaptive Cruise Control (ACC) braking event.
Consequence: Brakes that pull to one side during an ACC braking event may cause a sudden change in vehicle direction, increasing the risk of a crash.
Remedy: Dealers will inspect and replace the front brake modulator valves, as necessary. Some vehicles will have a software update which will alert driver when a replacement is required. All repairs will be performed free of charge. Owner notification letters were mailed beginning October 16, 2023. DTNA's number for this recall is FL-958. This recall expands and replaces previous recall 20V-390. All vehicles previously repaired under recall 20V-390 will need to have the new remedy performed.
22V118000 · Service Brakes, Air:drum
Mar 2, 2022
Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2022 Freightliner M2 vehicles. The brake drum may contact the hub assembly, causing the brake drum to crack.
Consequence & remedy
Consequence: A cracked brake drum can cause a loss of brake function and increase the risk of a crash.
Remedy: All vehicles have been remedied, therefore no owner notification letters are necessary. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-920.
21V326000 · Fuel System, Diesel:fuel Injection System:fuel Rail
May 7, 2021
Daimler Trucks North America, LLC (DTNA) is recalling certain 2018-2021 Freightliner Custom Chass XC Chassis, 108SD, Custom Chass XB Chassis, Business Class M2, 114SD, and Western Star 4700 vehicles. The sealing washer may not seat correctly in the pilot bore holes, allowing the high pressure fuel rail assembly to leak.
Consequence & remedy
Consequence: A fuel leak in the presence of an ignition source increases the risk of a fire.
Remedy: Dealers will replace the fuel rail and fuel lines, free of charge. Interim owner notification letters were mailed on June 21, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-886.
20V527000 · Electrical System:wiring; Engine And Engine Cooling
Sep 1, 2020
Daimler Trucks North America LLC (DTNA) is recalling certain 2018-2021 Freightliner 114SD, 108SD, and Business Class M2 vehicles. The engine harness wires may chafe at various locations around the air compressor and the frame rail. The damaged wires may short causing the engine to stall without any prior warning.
Consequence & remedy
Consequence: An engine stall can increase the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect for adequate harness clearance and verify that the harness has not been damaged. Vehicles with a damaged harness will receive a new harness that consists of a severe duty wrapping and additional hardware. All repairs will be performed free of charge. The recall began October 28, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-860.
Additional source detail variants (2)
Electrical System:wiring
Daimler Trucks North America LLC (DTNA) is recalling certain 2018-2021 Freightliner 114SD, 108SD, and Business Class M2 vehicles. The engine harness wires may chafe at various locations around the air compressor and the frame rail. The damaged wires may short causing the engine to stall without any prior warning.
Consequence: An engine stall can increase the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect for adequate harness clearance and verify that the harness has not been damaged. Vehicles with a damaged harness will receive a new harness that consists of a severe duty wrapping and additional hardware. All repairs will be performed free of charge. The recall began October 28, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-860.
Engine And Engine Cooling
Daimler Trucks North America LLC (DTNA) is recalling certain 2018-2021 Freightliner 114SD, 108SD, and Business Class M2 vehicles. The engine harness wires may chafe at various locations around the air compressor and the frame rail. The damaged wires may short causing the engine to stall without any prior warning.
Consequence: An engine stall can increase the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect for adequate harness clearance and verify that the harness has not been damaged. Vehicles with a damaged harness will receive a new harness that consists of a severe duty wrapping and additional hardware. All repairs will be performed free of charge. The recall began October 28, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-860.
20V466000 · Electrical System:wiring; Engine
Aug 7, 2020
Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2021 Freightliner Business Class M2 trucks. The engine harness may contact and chafe at various locations around the air compressor and the frame rail. If the wires are damaged, they may short circuit, possibly causing an engine stall.
Consequence & remedy
Consequence: A engine stall may increase the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect for adequate clearance between harness and engine, and for any engine harness damage. Vehicles with a damaged harness will receive a new harness. These repairs will be performed free of charge. The recall began October 5, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-858.
Additional source detail variants (2)
Engine
Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2021 Freightliner Business Class M2 trucks. The engine harness may contact and chafe at various locations around the air compressor and the frame rail. If the wires are damaged, they may short circuit, possibly causing an engine stall.
Consequence: A engine stall may increase the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect for adequate clearance between harness and engine, and for any engine harness damage. Vehicles with a damaged harness will receive a new harness. These repairs will be performed free of charge. The recall began October 5, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-858.
Electrical System:wiring
Daimler Trucks North America, LLC (DTNA) is recalling certain 2017-2021 Freightliner Business Class M2 trucks. The engine harness may contact and chafe at various locations around the air compressor and the frame rail. If the wires are damaged, they may short circuit, possibly causing an engine stall.
Consequence: A engine stall may increase the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect for adequate clearance between harness and engine, and for any engine harness damage. Vehicles with a damaged harness will receive a new harness. These repairs will be performed free of charge. The recall began October 5, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-858.
20V214000 · Exterior Lighting
Apr 14, 2020
Daimler Trucks North America LLC (DTNA) is recalling certain 2006-2020 Freightliner Columbia, 2006-2021 Freightliner Business Class M2, 2007-2020 Freightliner Coronado, 2014-2021 Freightliner 122 SD, 2007 Sterling A 9500, 2006 Freightliner Argosy, 2006-2007 Sterling AT9500, 2008-2021 Freightliner Cascadia, 2006-2008 Freightliner Classic, 2006-2011 Freightliner Century Class, 2006-2010 Freightliner FLD, and 2017 Western Star 5700 vehicles. The rear reflective tape may be partially covered by the mudflap hanger bracket, which may reduce the vehicle's visibility to other drivers on the road. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices, and Associated Equipment."
Consequence & remedy
Consequence: The vehicle's rearward visibility may be reduced, increasing the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect and reposition the reflective tape to ensure that it is completely visible, as necessary, free of charge. The recall began May 29, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL848.
20V176000 · Power Train:axle Assembly
Mar 23, 2020
Daimler Trucks North America LLC (DTNA) is recalling certain 2019-2020 Freightliner Business Class M2 and Freightliner 108SD vehicles equipped with Meritor MX 120 EVO Front Drive Steer axles. The axles may have insufficient lubrication, which may result in damage to the wheel end bearings.
Consequence & remedy
Consequence: If the bearings are damaged, the wheel may separate and cause a sudden loss of vehicle control, increasing the risk of crash.
Remedy: DTNA will notify owners, and dealers will inspect and replace the wheel end components, as necessary, free of charge. The recall began May 12, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-846.
20V127000 · Service Brakes, Air:disc:caliper
Mar 3, 2020
Daimler Trucks North America LLC (DTNA) is recalling certain 2019-2020 Freightliner 108SD, 114SD, Cascadia, Business Class M2, Western Star 4700 and 5700, Freightliner Custom Chassis S2, Custom Chassis XB, and Custom Chassis XC vehicles equipped with air disc brakes. The brake caliper mounting bolts may have been insufficiently tightened.
Consequence & remedy
Consequence: Loose brake caliper mounting bolts can reduce brake effectiveness, increasing the risk of a crash.
Remedy: DTNA will notify owners, and dealers will inspect and repair the vehicles, free of charge. The recall began May 1, 2020. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-845.
19V443000 · Power Train:axle Assembly
Jun 11, 2019
Daimler Trucks North America LLC (DTNA) is recalling certain 2019-2020 Business Class M2 and 2020 108SD vehicles equipped with Meritor MX 120 EVO Front Drive Steer axles. The axles may have insufficient lubrication, which may result in damage to the wheel end bearings.
Consequence & remedy
Consequence: If the bearings are damaged, the wheel may separate and cause a sudden loss of vehicle control, increasing the risk of crash.
Remedy: DTNA will notify owners, and dealers will inspect and replace the wheel end components, as necessary, free of charge. DTNA issued owners an interim notification on August 7, 2019. The recall began September 10, 2019. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-817.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
0No exact-year investigations in this snapshot.