2026 Peterbilt 520 problems, complaints & recalls
Safety recalls (2)
Steering 2026-01-19 · campaign 26V022000 · 219 vehicles
Defect: PACCAR Incorporated (PACCAR) is recalling certain 2026 Kenworth L770 and 2024-2026 Peterbilt 520 vehicles. The right-hand stand-up (RHSU) configuration on the steering cross-shaft may become stressed and fail.
Risk: A steering cross-shaft that fails can cause a loss of steering control, increasing the risk of a crash.
Fix: Dealers will inspect and repair the steering cross-shafts and replace any damaged or broken cross-shafts, free of charge. Owner notification letters were mailed March 13, 2026. Owners may contact Peterbilt's customer service at 1-940-591-4220 and Kenworth's customer service at 1-425-828-5888. PACCAR's number for this recall is 26PACA.
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.
Service bulletins (32)
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.
Engine 2026-10-16 · E340 · Service Bulletin/Repair Instructions
additional chassis have been added to the population
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 · P001 · Service Bulletin/Repair Instructions
"kw: the chassis list has been updated to include 1 chassis. the total chassis count is now 53. a link to the paccar powertrain prognostics webcast has been added in the links section. pb: the chassis list has been updated to include 8 chassis. the total chassis count is now 130. a link to the pacc
Engine 2026-08-27 · P001 · Service Bulletin/Repair Instructions
"kw: the chassis list has been updated to include 1 chassis. the total chassis count is now 53. a link to the paccar powertrain prognostics webcast has been added in the links section. pb: the chassis list has been updated to include 8 chassis. the total chassis count is now 130. a link to the pacc
Showing the 6 most recent of 32 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.