2021 Kenworth T800 problems, complaints & recalls
Safety recalls (1)
Service Brakes, Air:supply:reservoir/Tank 2024-02-23 · campaign 24V145000 · 936 vehicles
Defect: 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
Risk: Insufficient air volume can reduce braking performance and increase the risk of a crash.
Fix: 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.
Service bulletins (9)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-10-13 · 42-070 · Service Bulletin/Repair Instructions
due to supplier constraints, an authorized aftermarket surge tank has been made available.
Engine 2026-09-11 · P001 · Service Bulletin/Repair Instructions
"kenworth: dealers should check the chassis list and sir weekly for vin changes. 2 chassis added to the chassis list. peterbilt: dealers should check the chassis list and sir weekly for vin changes. 10 chassis added to the chassis list."
Forward Collision Avoidance: Warnings 2026-08-13 · 24KWL/PBL · Service Bulletin/Repair Instructions
the verbiage in the introduction section has been updated.
Engine 2026-06-06 · E311 · Service Bulletin/Repair Instructions
the paccar powertrain prognostics webcast video link has been removed. it will be included with updated information at a later date.
Engine 2026-05-18 · E311 · Service Bulletin/Repair Instructions
kenworth - the warranty section has been updated to include peterbilt-specific srt codes for cross-division repair filing.
Engine 2026-04-17 · 45-070 · Service Bulletin/Repair Instructions
the attached procedures document has been updated with more detail and explanations. this is not a stand-alone procedure. cummins quickserve troubleshooting will specify the use of these procedures while troubleshooting specific fault codes.
Showing the 6 most recent of 9 bulletins. Search all of them free at nhtsa.gov.
What owners report
No detailed complaint narratives on file.
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.