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RECALLROADTHE CAMPAIGN RECORD

MODEL-YEAR RECALL REPORT

2021 Thomas Built Buses Saf-T-Liner Hdx recalls

NHTSA's September 21, 2026 snapshot lists 16 safety recall campaigns for the 2021 Thomas Built Buses Saf-T-Liner Hdx, spanning 7 component groups. A model match does not confirm that a specific VIN is included.

Official source: NHTSA recall campaign file · Snapshot September 21, 2026

Distinct campaigns16not VIN-specific
Component groups7distinct top-level categories
Latest recordJuly 24, 2024report received
VIN resultNot checkeduse official lookup

01 / OFFICIAL CAMPAIGNS

2021 Thomas Built Buses Saf-T-Liner Hdx recall campaigns

The 2021 Thomas Built Buses Saf-T-Liner Hdx report contains 16 distinct NHTSA campaigns; the most recently received record is campaign 24V555000 dated July 24, 2024.
Component
EQUIPMENT
Report received
July 24, 2024
Potential units
27,494campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain Thomas Built Buses 2019-2022 Saf-T-Liner C2, Saf-T-Liner EFX, Saf-T-Liner HDX, Minotour DRW, 2020-2022 Saf-T-Liner C2 Jouley, and Minotour SRW school buses. The Emergency Exit Label lettering is too small and may be difficult to read. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 217, "Bus Emergency Exits and Window Retention and Release.".

Why it matters: Emergency exit labels that are difficult to read can prevent or delay the use of the emergency exit, increasing the risk of injury.

Remedy

Dealers will correct the lettering, free of charge. Owner notification letters were mailed September 5, 2024. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL918.

Owner notification: September 5, 2024 · Filing manufacturer: Daimler Trucks North America, LLC

Component
STRUCTURE
Report received
October 12, 2022
Potential units
17,613campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2011-2023 Thomas Built EFX and HDX school buses. The exterior roof panel was manufactured with insufficient joint strength. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 221, "School Bus Body Joint Strength.".

Why it matters: A school bus exterior roof panel with insufficient joint strength may separate during a crash, increasing the risk of injury.

Remedy

Dealers will add additional mechanical fasteners to secure the joints, free of charge. Owner notification letters were mailed June 2, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL957.

Owner notification: June 2, 2023 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 22V688000

Component
STRUCTURE
Report received
September 14, 2022
Potential units
1,259campaign-wide
Defect and consequence

Defect: Daimler Trucks North America LLC (DTNA) is recalling certain 2020-2023 Thomas Built Saf-T-Liner HDX school buses. The rear exterior side-body panel was manufactured with insufficient joint strength. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 221, "School Bus Body Joint Strength.".

Why it matters: A school bus panel with insufficient joint strength may separate during a crash, increasing the risk of injury.

Remedy

Dealers will add additional mechanical fasteners to secure the joints, free of charge. Owner notification letters were mailed November 11, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall FL953.

Owner notification: November 11, 2022 · Filing manufacturer: Daimler Trucks North America, LLC

Component
SEATS
Report received
August 19, 2022
Potential units
7,561campaign-wide
Defect and consequence

Defect: Daimler Trucks North America LLC (DTNA) is recalling certain 2011-2021 Thomas Built Saf-T Liner HDX school buses. The forward seat barriers may not provide sufficient protection to passengers. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 222, "School Bus Passenger Seating and Crash Protection.".

Why it matters: Occupants may collide with the front seat barriers with more force than intended during a crash, increasing the risk of injury.

Remedy

Dealers will install a spacer between the seat rail and the seat barrier, free of charge. Owner notification letters were mailed August 25, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL843. This recall replaces NHTSA recall 19V899.

Owner notification: August 25, 2023 · Filing manufacturer: Daimler Trucks North America, LLC

Component
SEATS
Report received
July 19, 2022
Potential units
1,806campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2014-23 Thomas Built Buses HDX and 2014-22 EFX school buses equipped with 39-inch S3C seat frames and 3-point flex seatbelts. The passenger seat frames may crack and rotate from fatigue.

Why it matters: Cracked passenger seat frames may not adequately secure passengers in the event of a crash, increasing the risk of injury.

Remedy

Dealers will secure the seat frames with brackets, free of charge. Owner notification letters were mail December 4, 2023. Owners may contact DTNA's customer service at 1-800-547-0712. DTNA's number for this recall is FL946.

Owner notification: December 4, 2023 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 22V272000

Component
ELECTRICAL SYSTEM
Report received
April 22, 2022
Potential units
138campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2019-2023 Thomas Built Bus HDX commercial buses. The positive battery cable may be routed improperly, allowing it to chafe against the transmission oil cooler hoses, which can cause an electrical short circuit.

Why it matters: An electrical short circuit can increase the risk of a fire.

Remedy

Dealers will inspect and repair the cable routing, as necessary, free of charge. Owner notification letters were mailed January 20, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL929.

Owner notification: January 20, 2023 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 22V271000

Component
ELECTRICAL SYSTEM
Report received
April 22, 2022
Potential units
2,943campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2019-2023 Thomas Built Bus HDX school buses. The positive battery cable may be routed improperly, allowing it to chafe against the transmission oil cooler hoses, which can cause an electrical short circuit.

Why it matters: An electrical short circuit can increase the risk of a fire.

Remedy

Dealers will inspect and repair the cable routing, as necessary, free of charge. Owner notification letters were mailed January 20, 2023. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL928.

Owner notification: January 20, 2023 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V915000

Component
EQUIPMENT
Report received
November 22, 2021
Potential units
1campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling one 2021 Thomas Built Buses Saf-T-Liner HDX transit bus. The gross axle weight rating (GAWR) may be improperly stated on the label. As such, this vehicle fails to comply with the requirements of Federal Motor Vehicle Safety Standard number 136, "Electronic Stability Control Systems on Heavy Vehicles.".

Why it matters: The operator may overload the vehicle while referencing the incorrect label, increasing the risk of a crash.

Remedy

A dealer will apply a new label, free of charge. The owner notification letter is expected to be mailed January 16, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL911.

Owner notification: January 12, 2022 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V850000

Component
ELECTRICAL SYSTEM
Report received
November 2, 2021
Potential units
1,434campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2022 Thomas Built EFX and HDX school buses. The nut for the power cable stud on the alternator may not have been tightened properly, which can cause a loose cable connection.

Why it matters: A loose power cable connection may cause electrical arcing, which can increase the risk of a fire.

Remedy

Dealers will inspect the alternator power cable connection and tighten it if necessary, free of charge. Owner notification letters were mailed on December 17, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL904.

Owner notification: December 17, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V660000

Component
STEERING
Report received
August 25, 2021
Potential units
114campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2016-2021 Thomas Built Buses Saf-T-Liner HDX transit buses equipped with an ISL or L9 engine. The power steering hose may be routed with inadequate clearance between the hose and the power cables, potentially damaging the power steering hose.

Why it matters: A damaged power steering hose can leak, and increase the risk of a fire.

Remedy

DTNA will inspect the power steering hose routing and modify it as necessary, free of charge. Owner notification letters are expected to be mailed on October 17, 2021. Owners may contact DTNA's customer service at 1-800-547-0712. DTNA's number for this recall is FL898.

Owner notification: October 15, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V659000

Component
STEERING
Report received
August 25, 2021
Potential units
1,934campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2016-2021 Thomas Built Buses Saf-T-Liner HDX school buses equipped with an ISL or L9 engine. The power steering hose may be routed with inadequate clearance between the hose and the power cables.

Why it matters: A worn power steering hose increases the risk of a fire.

Remedy

DTNA will inspect the power steering hose routing and modify it as necessary, free of charge. Owner notification letters are expected to be mailed on October 17, 2021. Owners may contact DTNA's customer service at 1-800-547-0712. DTNA's number for this recall is FL898.

Owner notification: October 15, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V462000

Component
SEATS
Report received
June 17, 2021
Potential units
9campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2018-2022 Thomas Built Saf-T-Liner HDX School Buses. These school buses may have been manufactured with an incorrect passenger seat configuration that does not provide the proper amount of seat back protection. As such, these school buses fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 222, "School Bus Passenger Seating and Crash Protection.".

Why it matters: In the event of a crash, the seats may not adequately protect the occupants, increasing the risk of injury.

Remedy

Dealers will replace the rear passenger seats, free of charge. No owner notification will be distributed, all units were repaired on August 12, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-892.

Owner notification: August 12, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V370000

Component
STEERING
Report received
May 19, 2021
Potential units
479campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2021-2022 Thomas Built Saf-T-Liner HDX School Buses and Saf-T-Liner C2 School Buses. The tie rod clamps may be loose, which could result in loose tie rod ends that could break or detach.

Why it matters: Detached or broken tie rod ends can result in steering loss, increasing the risk of a crash.

Remedy

Dealers will replace the tie rod clamp bolts and nuts, free of charge. Owner notification letters were mailed December 23, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-888.

Owner notification: December 23, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V327000

Component
FUEL SYSTEM, DIESEL
Report received
May 7, 2021
Potential units
1,262campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DNTA) is recalling certain 2018-2021 Thomas Built Buses Saf-T-Liner HDX School Buses. The sealing washer may not seat correctly in the pilot bore holes, allowing the high pressure fuel rail assembly to leak.

Why it matters: A fuel leak in the presence of an ignition source increases the risk of a fire.

Remedy

Dealers will replace the fuel rail and fuel lines, free of charge. Interim owner notification letters were mailed on June 21, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-886.

Owner notification: October 29, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V255000

Component
STEERING
Report received
April 12, 2021
Potential units
1,252campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2021-2022 Thomas Built Buses Saf-T-Liner C2, Saf-T-Liner EFX, and Saf-T-Liner HDX school buses. The steering arm and tie rod bolts may have a defective seam that can fracture.

Why it matters: A fractured bolt may cause a loss of steering, increasing the risk of a crash.

Remedy

DTNA will notify owners, and dealers will replace the tie rod arm bolts and steering arm, free of charge. The recall began on June 10, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-884.

Owner notification: June 10, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

CAMPAIGN

NHTSA 21V017000

Component
SERVICE BRAKES, HYDRAULIC
Report received
January 20, 2021
Potential units
6campaign-wide
Defect and consequence

Defect: Daimler Trucks North America, LLC (DTNA) is recalling certain 2021 Thomas Built Buses Saf-T-Liner HDX and EFX school buses. On certain vehicles, one of the six brake caliper mounting bolts on the driver side steer axle may have been incorrectly tightened.

Why it matters: The loose bolt could result in the other caliper bolts to loosen. Insufficiently tightened bolts may not provide adequate clamping force between the brake caliper and brake anchor plate, resulting in reduced brake effectiveness, increasing the risk of a crash.

Remedy

DTNA will notify owners, and dealers will inspect and repair as necessary, free of charge. The recall began March 17, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-873.

Owner notification: March 17, 2021 · Filing manufacturer: Daimler Trucks North America, LLC

02 / COMPONENT BREADTH

What defects are listed for the 2021 Thomas Built Buses Saf-T-Liner Hdx?

The most frequent component groups in 2021 Thomas Built Buses Saf-T-Liner Hdx campaign records are Steering (4), Seats (3), Electrical System (3), Equipment (2), Structure (2); these counts describe filed campaigns rather than observed failure rates.
Steering4
Seats3
Electrical System3
Equipment2
Structure2