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Service bulletin 15-034

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11027059
Published by NHTSA2026-01-06
Manufacturer's number15-034
Manufacturer's date2025-12-23
Campaign id or software version15-034
NHTSA componentSTEERING

NHTSA's summary

Certain Kenworth L770 and Peterbilt Model 520 chassis may encounter a slight increase in effort in the right-hand steering shaft when turning the wheel.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Steering

Vehicles listed
KENWORTH L7702025
PETERBILT 5202024, 2025, 2026

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20260142026-01-19. Steering
26V0220002026-01-19. STEERING
24V9080002024-12-03. STEERING:LINKAGES:KNUCKLE:SPINDLE:ARM; STEERING:LINKAGES:TIE ROD ASSEMBLY
20243352024-06-12. Steering
24V4330002024-06-12. STEERING:LINKAGES:TIE ROD ASSEMBLY; STEERING:LINKAGES:DRAG:LINK:CONNECTION
20240362024-01-25. Steering
24V0440002024-01-25. STEERING
24V0430002024-01-25. STEERING:LINKAGES:KNUCKLE:SPINDLE:ARM

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
24KWC/24PBC2026-08-20. Service bulletin. Updated Sheppard Steering Gear Classification Tool link in Inspection Procedure
26PACA2026-06-03. Service bulletin. Updated cross shaft and bearing installation steps have been added to the repair procedures.
46-0282026-06-03. Service campaign. Certain Peterbilt Model 520 BEV chassis with an Accelera Power Control and Accessory System (PCAS) were manufactured without a check valve in the power steering system.
24KWC/PBC2026-04-07. Service bulletin. Sheppard Recall Update March 2026 - The Parts section has been updated with revised steps for opening a TCS365 Order Support – Order Inquiry case.
15-0342026-03-05. Service campaign. Battery Electric Vehicle (BEV) de-energizing and re-energizing procedures have been added to the bulletin for Peterbilt Model 520 BEV.
26PACA2026-02-18. Service campaign. KW: Certain Kenworth L770 chassis may have Right-Hand (RH) steering cross shaft bearing mounting holes that are misaligned, resulting in increased stress on the steering cross shaft on the Right-Hand Stand-Up (RHSU) controls configuration. Failure of the RH steering cross shaft could result in the loss of RH steering control which may increase the risk of a crash. PB: Certain Peterbilt Model 520 / 520 BEV chassis may have Right-Hand (RH) steering cross shaft bearing mounting holes that are misaligned, resulting in increased stress on the steering cross shaft on the Right-Hand Stand-Up (RHSU) controls configuration. Failure of the RH steering cross shaft could result in the loss of RH steering control which may increase the risk of a crash.
24PBK2025-02-05. Service bulletin. Safety Recall Specific 2024 Peterbilt Model 367, 389, 548, and 2024-2025 520 and 567 chassis equipped with a PACCAR 20k Steer Axle have been identified as having steering arm and/or tie rod arm fasteners that may be improperly torqued and can be at risk of failing. If both fasteners in either steering arm or tie rod arm fail, there may be a loss of steering control, which could increase the risk of a crash. Affected chassis will have all steering arm and tie rod arm bolts removed, replaced with new bolts, and torqued properly.
24PBK2025-01-07. Service bulletin. Interim Safety Recall Specific 2024 Peterbilt model 367, 389, 548, and 2024-2025 Peterbilt 520 and 567 chassis equipped with a PACCAR 20k Steer Axle have been identified as having steer arm and/or tie rod arm fasteners that may be improperly torqued and can be at risk of failing. If both fasteners in either steering arm or tie rod arm fail, there may be a loss of steering control, which could increase the risk of a crash. At this time, parts are not available to complete the necessary repairs. This bulletin will be updated when parts become available.
15-0312024-04-04. Service bulletin. This Bulletin contains parts ordering and replacement procedures for Steering Gears identified as SUSPECT under 24PBC ONLY. Steering Gears repaired under this bulletin MUST be entered into the Serial Number Tracking Form for 24PBC.
24PBB2024-03-04. Service bulletin. Reference Hendrickson Recall 23E-095 Hendrickson alerted Peterbilt to a limited number of Hendrickson COMPOSILITE® EXS20 steerable, auxiliary lift axle suspension assemblies and individual steering knuckle assembly components that are equipped with bearing journals that may not have been seated correctly to the backbones of the left and right-side steering knuckle assembly components during manufacture. Loss of oil from the respective axle hubs may cause the spindles to become loose from the steering knuckle assemblies or otherwise fracture and/or cause wheel end hub damage . This can further result in foreign object debris on the roadway, increasing the risk of a crash and/or injury.