While driving the factory floor mat can slide under the rear of the brake pedal while it is being applied. Once pedal is released it will still hold brake pressure causing brakes to remain engaged while still allowing vehicle to move down the road in turn causing brakes to heat up and either lockup/ catch fire or once cooled become inoperable. We have heat marks on exterior of front drums and pads were glazed over.
The worst 2021 Kenworth T440 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Brakes1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Brakes1
Recalls 4
Electrical system: software
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2021-2025 Peterbilt and Kenworth vehicles, equipped with Bendix EC80 Advanced Electronic Control Units (ECU). Please see the recall report for a complete list of models. Electrical noise and low signal to the power line carrier may cause the ECU to incorrectly process commands or stop functioning.
- Risk
- Safety systems that depend on the ECU (Automatic Traction Control, ABS, Electronic Stability Control, Active Cruise Control, and Collison Mitigation System) may not function properly or at all, increasing the risk of a crash.
- Remedy
- Dealers will reprogram the ECU software, free of charge. Owner notification letters were mailed February 3, 2025. Owners may contact Kenworth's customer service at 1‑425‑828‑5888 and Peterbilt's customer service at 1‑940‑591‑4220. PACCAR's numbers for this recall are 24KWL and 24PBL.
Recall number 24V915000 · Recall details
Service brakes, air: supply: reservoir/tank
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2009-2021 Kenworth C500, 2012-2021 Kenworth T440, 2009-2015 Kenworth T660, 2015-2024 Kenworth T680, 2009-2024 Kenworth T800, 2009-2020 Kenworth T370, 2014-2023 Kenworth T880, 2011-2016 Kenworth T470, 2023 Kenworth T480, and 2009-2019 Kenworth W900 vehicles. The air tanks have an insufficient volume of air for the brake system. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
- Risk
- Insufficient air volume can reduce braking performance and increase the risk of a crash.
- Remedy
- Dealers will install the correct volume air tanks, free of charge. Owner notification letters were mailed August 12, 2024. Additional owner notification letters were mailed October 27, 2025. Owners may contact PACCAR customer service at 1‑425‑828‑5888. PACCAR's number for this recall is 24KWD.
Recall number 24V145000 · Recall details
Fuel system, diesel: delivery: hoses, lines/piping, and fittings
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2021-2022 Peterbilt 536, 537, 548 and Kenworth T270, T280, T370, T380, T440, T470, and T480 vehicles equipped with Cummins L9 diesel engines. A fuel leak may occur from the fuel hose between the fuel pump and the remote fuel filter head.
- Risk
- A fuel leak in the presence of an ignition source increases the risk of a fire.
- Remedy
- Cummins will replace the fuel hoses, free of charge. Owner notification letters are expected to be mailed in October 2021. Owners may contact PACCAR's customer service at 1‑425‑828‑5888 (Kenworth) and 1‑940‑591‑4220 (Peterbilt). PACCAR's numbers for this recall are 21PBG and 21KWF.
Recall number 21V601000 · Recall details
Fuel system, diesel: fuel injection system: fuel rail
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2018-2021 Peterbilt 337, 348, 365, 367, 520, 567, Kenworth T270, T370, T440, T470, T800 and T880 vehicles. The sealing washer may not seat correctly in the pilot bore holes, allowing the high pressure fuel rail assembly to leak.
- Risk
- A fuel leak in the presence of an ignition source increases the risk of a fire.
- Remedy
- Dealers will inspect the rail threads and fuel lines, and replace the rail as necessary, free of charge. Owners may contact PACCAR customer service at 1‑425‑828‑5888 (Kenworth) or 1‑940‑591‑4220 (Peterbilt). PACCAR's numbers for this recall are 21KWC and 21PBD.
Recall number 21V391000 · Recall details
Technical service bulletins for the 2021 Kenworth T440 11
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes
- Safety recall
- Info Only
- Safety Recall â Interim Notification
- Due to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet...
- Information Only: Due to differences between the PACCAR MX-11 or MX-13 2021A and 2021B engines,...
- Non-Safety Campaign
- Fix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are...
- Information Only
- Safety Recall
What 2021 Kenworth T440 owners say
Most recent owner complaints, unedited.
Compare the 2021 Kenworth T440
Other model years
2021
Questions about the 2021 Kenworth T440
Is the 2021 Kenworth T440 reliable?
Owners have filed 1 complaint about the 2021 Kenworth T440, close to a typical T440 model year.
What is the most common problem with the 2021 Kenworth T440?
Brakes, with 1 complaint.
How many recalls does the 2021 Kenworth T440 have?
4 recalls, covering electrical system, service brakes, air and fuel system, diesel.
Was there a recall on the 2021 Kenworth T440 brakes?
Yes, 1 recall: 24V145000. Check your VIN to see if your car still needs the free repair.
VIN decoder
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