This is the first of several entries I am making. The DEF headers on 7 of our trucks have had the same failure and if I see more I will report these also. This is an emission system issue. PART NUMBER 04-31354-004 HEADER-SSI,CONC.6BOLY,CMNS
The worst 2023 Freightliner Business Class M2 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
Recalls 8
Fuel system, diesel: delivery: hoses, lines/piping, and fittings
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain 2022-2025 Freightliner Business Class M2, 2022-2027 FCCC XCM, FCCC XCR, 2023 Freightliner 108SD, 2024-2027 FCCC XCS and FCCC XBS vehicles equipped with certain Cummins L9 diesel engines. The remote fuel filter hoses may separate from the fitting, causing a fuel leak and an engine stall.
- Risk
- A fuel leak in the presence of an ignition source increases the risk of a fire. An engine stall increases the risk of a crash.
- Remedy
- Cummins will replace the fuel hoses, free of charge. Owner notification letters are expected to be mailed November 20, 2026. Owners may contact DTNA customer service at 1‑800‑547‑0712 or Cummins customer service at 1‑800‑286‑6467. DTNA's number for this recall is F1042.
Recall number 26V660000 · Recall details
Suspension: critical fasteners
- What is wrong
- 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.
- Risk
- 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.
Recall number 25V760000 · Recall details
Steering
- What is wrong
- Fontaine Modification Company (Fontaine Modification) is recalling certain 2022-2024 Freightliner Business Class M2 vehicles. Welds may crack and fail, allowing the Intermediate steering shaft assembly to detach from the steering column.
- Risk
- A steering shaft that detaches can result in a loss of steering, increasing the risk of a crash.
- Remedy
- Fontaine Modification will replace the intermediate steering shaft, free of charge. Owner notification letters are expected to be mailed September 3, 2025. Owners may contact Fontaine Modification customer service at 1‑800‑366‑8246.
Recall number 25V504000 · Recall details
Forward collision avoidance: automatic emergency braking
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain 2024-2025 Freightliner 108SD, 2022-2025 Freightliner 114SD, Freightliner Business Class M2, 2025 Freightliner eM2, 2020-2025 Western Star 49X, 2021-2025 Western Star 47X, and 2022-2025 Western Star 57X vehicles that may be upfitted with a body lighting interface controller and replacement brake lights. The brake lights may not illuminate when the brakes are automatically applied during an active brake assist (ABA) event.
- Risk
- Brake lights that fail to illuminate can fail to indicate to other drivers that the vehicle is slowing down, increasing the risk of a crash.
- Remedy
- Dealers will update the ABA software, free of charge. Owner notification letters were mailed October 24, 2024. Owners may contact DTNA customer service at 800‑745‑8000. DTNA's number for this recall is F1009.
Recall number 24V668000 · Recall details
Electronic stability control (ESC)
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain short wheelbase 2020-2024 Freightliner Cascadia, 2021-2024 Freightliner M2 Business Class, 2022 Western Star 4700, and 2020 Freightliner Classic Cascadia vehicles. The vehicle is equipped with an electronic stability control system and tire combination that may understeer during a J-turn. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 136, "Electronic Stability Control Systems on Heavy Vehicles."
- Risk
- Understeering during a J-turn may increase the risk of a crash.
- Remedy
- DTNA will replace the tires, free of charge. Owner notification letters were mailed June 19, 2023. Owners may contact DTNA customer service at 1‑800‑547‑0712. DTNA's number for this recall is FL971.
Recall number 23V299000 · Recall details
Tires
- What is wrong
- 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."
- Risk
- 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.
Recall number 22V919000 · Recall details
Engine and engine cooling: engine: engine control module (ecu/ECM)
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain 2023 Freightliner 108SD, 114SD, Business Class M2, Cascadia, 2023 Freightliner FCCC MC, MT45, S2C 106CAB, XCM, S2RV 106CAB, XCR, XCS, and 2023 Western Star 4700, 49X, and 47X vehicles. The engine control module (ECM) may experience an internal short-circuit, which can result in an unexpected engine shut down.
- Risk
- Unexpected engine shut down can increase the risk of a crash.
- Remedy
- Cummins will replace the ECM, free of charge. Owner notification letters are expected to be mailed September 26, 2022. Owners may contact DTNA customer service at 1‑800‑547‑0712. DTNA's number for this recall is FL-949.
Recall number 22V554000 · Recall details
Steering
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain 2023 Freightliner M2, 108SD, and 114SD vehicles. The u-joint pinch bolt on the steering shaft may become detached, which can cause a loss of steering control.
- Risk
- Loss of steering control can increase the risk of a crash.
- Remedy
- Dealers will inspect and repair the joint, as necessary, free of charge. Owner notification letters are expected to be mailed august 1, 2022. Owners may contact DTNA customer service at 1‑800‑547‑0712. DTNA's number for this recall is FL-937.
Recall number 22V394000 · Recall details
See all 8 recalls for the 2023 Freightliner Business Class M2
Technical service bulletins for the 2023 Freightliner Business Class M2 166
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Warranty Information letter for Detroit Line or Line Seal, High Pressure Fuel Injector Standard Repair...
- Customer Advisory Letter for Torque Converter Parameter Mismatch
- Detroit Transmissions Manual Update for Symptom Diagnostics — DT12 C/D Box Range Shift to Neutral with...
- Technical Service Bulletin for Front Lighting Ground Splice Pack Failure
- Revised Warranty Information letter for missing chamber caging bolts
- Truck Equipment Manufacturer Solution for PTO Mode Delay for Driving PTO
- Truck Equipment Manufacturer upfit guide for Detroit Assurance Forward Radar Relocation and Adjustment
- Warranty Information letter for missing chamber caging bolts
- Truck Equipment Manufacturer Solution for Detroit Assurance Parameters for an Obstructed Multi-Purpose...
- Warranty Information letter for Reman Parts Usage Policy Reminder
See all 166 bulletins for the 2023 Freightliner Business Class M2
What 2023 Freightliner Business Class M2 owners say
Most recent owner complaints, unedited.
Compare the 2023 Freightliner Business Class M2
Other model years
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Questions about the 2023 Freightliner Business Class M2
Is the 2023 Freightliner Business Class M2 reliable?
Owners have filed 1 complaint about the 2023 Freightliner Business Class M2, fewer than a typical Business Class M2 model year.
What is the most common problem with the 2023 Freightliner Business Class M2?
There are not enough complaints to tell.
How many recalls does the 2023 Freightliner Business Class M2 have?
8 recalls, covering fuel system, diesel, suspension and steering.
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