2025 Kenworth L770 problems, complaints & recalls
Safety recalls (3)
Exterior Lighting:lighting Control Module:software 2025-06-26 · campaign 25V436000 · 56,260 vehicles
Defect: PACCAR Incorporated (PACCAR) is recalling certain 2024-2026 Kenworth T480, T680, T880, W990, Peterbilt 520, 536, 537, 548, 567, 579, 589, 2025 Kenworth T180, Peterbilt 535, 2025-2026 Kenworth T280, T380 and L770 vehicles. The tail brake light, upper and lower beam headlights, reverse light, and turn signal may not illuminate as intended. In addition, the lift axles, if lowered, may revert to a raised position, or oscillate up and down when the signal warning lights are activated. As such, these
Risk: Delayed and unsteady headlights can result in insufficient illumination of the road, decreasing the driver's visibility and increasing the risk of a crash. In addition, an unexpected position change of the lift axles may increase the risk of injury.
Fix: Dealers will update the VCU software, free of charge. Owner letters were mailed August 19, 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 number for this recall is 25PACF.
Steering:linkages:tie Rod Assembly 2024-06-12 · campaign 24V433000 · 7,410 vehicles ⚠ DO NOT DRIVE
Defect: PACCAR Incorporated (PACCAR) is recalling certain 2025 Kenworth K270, K370, L770, T280, T380, T480, T680, T880, W900, W990, 2025 Peterbilt 220, 520, 536, 537, 548, 567, 579, and 589 trucks. The tie rod or drag link assembly may contain an improperly heat-treated ball stud, causing the ball stud to break.
Risk: A broken ball stud can cause a complete loss of steering control, increasing the risk of a crash.
Fix: Owners are advised not to drive their vehicles until the remedy has been completed. Dealers will inspect and replace the tie rod and drag link assemblies as necessary, free of charge. Owner notification letters were mailed August 6, 2024. Owners may contact Kenworth customer service at 1-425-828-5888 and Peterbilt customer service at 1-940-591-4220. PACCAR's numbers for this recall are 24KWG and 24PBG.
Steering 2024-01-25 · campaign 24V044000 · 45,887 vehicles
Defect: PACCAR Incorporated (PACCAR) is recalling certain 2024-2025 Kenworth T280, T380, T480, T680, T880, L770, W990, and 2024-2025 Peterbilt 389, 520, 535, 536, 537, 548, 567, 579, 589 trucks. The steering gear assemblies may have been assembled incorrectly with fewer recirculating balls than are required, which may result in a loss of steering control.
Risk: A loss of steering control increases the risk of a crash.
Fix: Dealers will inspect and replace the steering gears as necessary, free of charge. Owner notification letters were mailed March 20, 2024. Owners may contact Peterbilt customer service at 1-940-591-4220 and/or Kenworth customer service at 1-425-828-5888. PACCAR's numbers for this recall are 24PBC and 24KWC.
Service bulletins (26)
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 2026-10-28 · 99-050 · Service Bulletin/Repair Instructions
there is an update to the carb base emissions warranty limits table and manufacturer’s warranty coverage section in certain engine model year (emy) 2024-2026 px-7 and px-9 operator’s manuals.
Electrical System 2026-10-23 · 37-007 · Service Bulletin/Repair Instructions
eaton service bulletin taib-1026 instructs dealers to update the master switch module (msm) software. the update must be completed before performing a davie4 learn dash switches procedure to fix intermittent dash switch functionality.
Unknown Or Other 2026-10-13 · 15-031 · Service Bulletin/Repair Instructions
removed hyperlinks for bulletin migration
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."
Engine 2026-09-03 · P002 · Service Bulletin/Repair Instructions
"kw: a link to the paccar powertrain prognostics webcast has been added in the links section. pb: the chassis list has been updated to include 2 chassis. the total chassis count is now 4. a link to the paccar powertrain prognostics webcast has been added in the links section."
Engine 2026-08-27 · P002 · Service Bulletin/Repair Instructions
"kw: a link to the paccar powertrain prognostics webcast has been added in the links section. pb: the chassis list has been updated to include 2 chassis. the total chassis count is now 4. a link to the paccar powertrain prognostics webcast has been added in the links section."
Showing the 6 most recent of 26 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.