June 3, 2024 NHTSA CAMPAIGN NUMBER: 24V392000
Wheel Detachment from Loose Wheel Hub Fasteners
A loss of vehicle control increases the risk of a crash.
NHTSA Campaign Number: 24V392
Manufacturer Daimler Trucks
North America, LLC
Components WHEELS
Potential Number of Units Affected 106
Summary
Daimler Trucks North America, LLC (DTNA) is recalling certain 2025 Thomas Built Buses Saf-T-Liner C2 and EFX school buses. The wheel hub fasteners may loosen and cause the wheel to detach, which can result in a loss of vehicle control.
Remedy
The remedy is currently under development. Owner notification letters are expected to be mailed July 30, 2024. Owners may contact DTNA customer service at 800-745-8000. DTNA’s number for this recall is F1002.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Check for Daimler Trucks North America Recalls
Chronology :
On or about April 22, 2024, a vehicle being tested on a dynamometer at one of DTNA’s manufacturing plants experienced wheel end separation. The following day, DTNA notified the axle supplier of the incident and the supplier determined that the wheel on this vehicle separated because of a missing snap ring that should have been present in the preset wheel hubs. The supplier continued to review the concern and also identified units at DTNA’s facility that used 4-piece fastener hubs (a different wheel hub component) where the locking tabs on the retainer washier were not bent inwards as required. From late April through early May 2024, the supplier continued to inspect other recently built vehicles at the DTNA manufacturing facility. Up to this point, the supplier’s investigation was focused on the rear axle and on May 6, 2024, it also began to analyze whether the issue may also be present on the front axle. A review of additional units could not confirm whether the locking tabs were correctly positioned. Thereafter, DTNA and the supplier continued to review the concern and DTNA conducted a detailed review of any potentially related reports and claims. On May 30, 2024, out of abundance of caution, DTNA decided to conduct a voluntary safety recall on the vehicles built within the above-mentioned manufacturing date range. DTNA is not aware of any warranty claims, field service reports, deaths, injuries or property damage claims related to wheel separations from this issue.
2 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| THOMAS BUILT BUSES | SAF-T-LINER C2 | 2025 |
| THOMAS BUILT BUSES | SAF-T-LINER EFX | 2025 |
2 Associated Documents
Recall 573 Report
RCLRPT-24V392-1535.PDF 214.941KB
Recall Acknowledgement
RCAK-24V392-4684.pdf 645.525KB
Latest Recalls Documents
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- NOTE: unlock before adjusting the torque value, lock after adjusting for stability of working torque; when finished, loosen locking ring and adjust to the lowest value for next use
Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 24V-392
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Daimler Trucks North America, LLC MAY 31, 2024 NHTSA Recall No. : 24V-392 Manufacturer Recall No. : F1002 Manufacturer Information :
Manufacturer Name : Daimler Trucks North America, LLC Address : 4747 N. Channel Avenue
Portland OR 97217-3849
Company phone : 800-745-8000 Population :
Number of potentially involved : 106 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2025-2025 Thomas Built Buses SAF-T-LINER C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL
Descriptive Information : This recall population includes certain model year 2025 TBB (Thomas Built Buses) SAF-T-LINER C2 and SAF-T-LINER EFX vehicles. The subject population includes vehicles equipped with axles that were manufactured at the Cummins Meritor facility in York, South Carolina. The vehicle population has been determined based on the information provided by Cummins Meritor and excludes vehicles with axles manufactured at other supplier facilities and before and after a supplier process change.
Production Dates : FEB 05, 2024 – APR 23, 2024
VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2025-2025 Thomas Built Buses SAF-T-LINER EFX Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL
Descriptive Information : This recall population includes certain model year 2025 TBB (Thomas Built Buses) SAF-T-LINER C2 and SAF-T-LINER EFX vehicles. The subject population includes vehicles equipped with axles that were manufactured at the Cummins Meritor facility in York, South Carolina. The vehicle population has been determined based on the information provided by Cummins Meritor and excludes vehicles with axles manufactured at other supplier facilities and before and after a supplier process change.
Production Dates : FEB 22, 2024 – FEB 27, 2024
VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 24V-392 Page 2 Description of Defect :
Description of the Defect : A defect, which relates to motor vehicle safety, exists in certain model year 2025 Thomas Built Buses Saf-T-Liner C2 and EFX vehicles. The affected vehicles may be missing the snap ring on the preset hubs and/or have unbent retainer tabs on the conventional 4-piece fastener hubs. This could allow the wheel hub fasteners to loosen, creating excessive endplay in the wheel-end system.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : If the loose or missing hub fasteners are not addressed and progress to the
point of allowing excessive endplay in the wheel-end system, wheel separation may occur resulting in an increased risk of loss of vehicle control and a crash.
Description of the Cause : NR Identification of Any Warning
that can Occur : Wheels with excessive endplay may trigger anti-lock braking system (ABS) diagnostic trouble codes & may also result in hub oil leakage because of a failed hub seal. Involved Components : Component Name 1 : RETAINER RING,SNAP,PLUS,FL1
Component Description : Retainer Snap Ring (Preset Hub) Component Part Number : CM 10031172 Component Name 2 : WASHER – TANGED Component Description : Retainer Washer Component Part Number : 11-28988-000 Supplier Identification : Component Manufacturer
Name : Meritor Incorporation Address : 2135 West Maple
Troy Michigan 48084
Country : United States The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 24V-392
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Chronology :
On or about April 22, 2024, a vehicle being tested on a dynamometer at one of DTNA’s manufacturing plants experienced wheel end separation. The following day, DTNA notified the axle supplier of the incident and the supplier determined that the wheel on this vehicle separated because of a missing snap ring that should have been present in the preset wheel hubs. The supplier continued to review the concern and also identified units at DTNA’s facility that used 4-piece fastener hubs (a different wheel hub component) where the locking tabs on the retainer washier were not bent inwards as required. From late April through early May 2024, the supplier continued to inspect other recently built vehicles at the DTNA manufacturing facility. Up to this point, the supplier’s investigation was focused on the rear axle and on May 6, 2024, it also began to analyze whether the issue may also be present on the front axle. A review of additional units could not confirm whether the locking tabs were correctly positioned. Thereafter, DTNA and the supplier continued to review the concern and DTNA conducted a detailed review of any potentially related reports and claims. On May 30, 2024, out of abundance of caution, DTNA decided to conduct a voluntary safety recall on the vehicles built within the above-mentioned manufacturing date range. DTNA is not aware of any warranty claims, field service reports, deaths, injuries or property damage claims related to wheel separations from this issue.
Description of Remedy :
Description of Remedy Program : DTNA is preparing a remedy, which is currently under development.
Repairs will be performed free of charge by Daimler Truck North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component :
Identify How/When Recall Condition was Corrected in Production : The remedy component will prevent excessive end play within the wheel hub assembly.
The supplier advised DTNA that axles produced after April 17, 2024 were subject to a different inspection process
Recall Schedule :
Description of Recall Schedule : NR
Planned Dealer Notification Date : JUN 20, 2024 – JUN 20, 2024
Planned Owner Notification Date : JUL 30, 2024 – JUL 30, 2024
* NR – Not Reported
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