The worst 2023 Thomas Built Buses Saf-T-Liner HDX problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
Recalls 8
Engine and engine cooling: cooling system: hoses/lines/piping/fittings
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain Thomas Built Buses 2023-2026 Saf-T-Liner EFX and Saf-T-Liner HDX school buses. The heater hose clamps may not have been tightened properly, causing the hose to disconnect and leak heating coolant inside the passenger compartment.
- Risk
- Contact with hot heating coolant may burn occupants, increasing the risk of injury.
- Remedy
- Dealers will inspect and replace the heater hose clamps, as necessary, free of charge. Owner notification letters were mailed April 10, 2026. Owners may contact DTNA customer service at 1‑800‑547‑0712. DTNA's number for this recall is F1030.
Recall number 26V086000 · Recall details
Engine and engine cooling: cooling system: hoses/lines/piping/fittings
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain Thomas Built Buses 2023-2025 Saf-T-Liner EFX and 2023-2026 Saf-T-Liner HDX vehicles. The heater hose clamps may not have been tightened properly, causing the hose to disconnect and leak heating coolant inside the passenger compartment.
- Risk
- Contact with hot heating coolant may burn occupants, increasing the risk of injury.
- Remedy
- Dealers will inspect and replace the heater hose clamps, as necessary, free of charge. Owner notification letters were mailed April 10, 2026. Owners may contact DTNA customer service at 1‑800‑547‑0712. DTNA's number for this recall is F1030.
Recall number 26V087000 · Recall details
Structure: body: roof and pillars
- What is wrong
- 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."
- Risk
- 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.
Recall number 22V762000 · Recall details
Structure: body
- What is wrong
- 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."
- Risk
- 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.
Recall number 22V688000 · Recall details
Engine and engine cooling: engine: engine control module (ecu/ECM)
- What is wrong
- Daimler Trucks North America, LLC (DTNA) is recalling certain 2023 Thomas Built Saf-T-Liner HDX and Saf-T-Liner C2 school buses. The engine control module (ECM) may experience an internal short-circuit, which can result in an unexpected engine shut down.
- Risk
- Unexpected engine shut down can increase the risk of a crash. Additionally, a disabled school bus may require an evacuation procedure in an uncontrolled traffic situation, increasing the risk of injury to passengers.
- Remedy
- Cummins will replace the ECM, free of charge. Owner notification letters are expected to be mailed September 26, 2022. Owners may contact DTNA customer service at 1‑800‑547‑0712. DTNA's number for this recall is FL-949.
Recall number 22V553000 · Recall details
Seats: mid/rear assembly
- What is wrong
- 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.
- Risk
- 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.
Recall number 22V510000 · Recall details
Electrical system: 12v/24v/48v battery: cables
- What is wrong
- 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.
- Risk
- 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.
Recall number 22V271000 · Recall details
Electrical system: 12v/24v/48v battery: cables
- What is wrong
- 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.
- Risk
- 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.
Recall number 22V272000 · Recall details
See all 8 recalls for the 2023 Thomas Built Buses Saf-T-Liner HDX
Technical service bulletins for the 2023 Thomas Built Buses Saf-T-Liner HDX 26
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Warranty Information letter for Detroit Line or Line Seal, High Pressure Fuel Injector Standard Repair...
- Technical Service Bulletin for Electrical Wiring Modifications for Type DFootwell Heater
- Service Solution for HDX DEF Header Service Replacement Additional Parts
- Service Solution for Timer relay TBB 202400 replacement
- My communications for DTNA Announces Extended Coverage Policy Updates
- Service Solution for Floor Covering Bubbles
- Service Solution for HDX / EFX front lighting replacement
- Emission Recall for DD8 EGR Monitor Software Reprogramming
- Service Solution for Wiper Module TBB 61201552 replacement
- CX Advocate for CARB tightening the Readiness Criteria applied to On-Board Diagnostic (OBD) test...
See all 26 bulletins for the 2023 Thomas Built Buses Saf-T-Liner HDX
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Questions about the 2023 Thomas Built Buses Saf-T-Liner HDX
Is the 2023 Thomas Built Buses Saf-T-Liner HDX reliable?
Owners have filed 0 complaints about the 2023 Thomas Built Buses Saf-T-Liner HDX.
What is the most common problem with the 2023 Thomas Built Buses Saf-T-Liner HDX?
There are not enough complaints to tell.
How many recalls does the 2023 Thomas Built Buses Saf-T-Liner HDX have?
8 recalls, covering engine and engine cooling, structure and seats.
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