Campaign 22V-553

Engine control module (ECM) may experience an internal short-circuit, which can result in an unexpected engine shut down

Defect summary

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.

Consequence

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.

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.

Source: NHTSA ODI recalls file, campaign 22V553000. Text as published by NHTSA.

Vehicles covered

2 product lines are covered

Owner complaints filed with NHTSA about engine and cooling on these vehicles: 0, of which 0 involved a crash, fire, injury or death. Complaints are not verified by NHTSA.

Vehicles covered by campaign 22V-553
Make	Model	Model years	Complaints on this component
Thomas Built Buses	Saf-T-Liner C2	2023	0
Thomas Built Buses	Saf-T-Liner HDX	2023	0

Source: NHTSA ODI recalls and complaints files. Equipment, tire and child-seat campaigns list products, not vehicles.

Investigation

No NHTSA investigation is linked to this recall

Most recalls are started by the manufacturer. This one lists "Manufacturer" as its origin.

Before the recall

No service bulletins on this component preceded the recall

Distinct manufacturer communications on the same component group, make, model and model year in the 24 months before the report date.

Source: NHTSA manufacturer communications file.

Service bulletins

26V-109 Feb 24, 2026
Heater hose may rupture, which can result in hot coolant leaking inside the passenger compartment
26V-087 Feb 13, 2026
Heater hose clamps may not have been tightened properly, causing the hose to disconnect and leak heating coolant inside the passenger compartment
26V-086 Feb 13, 2026
Heater hose clamps may not have been tightened properly, causing the hose to disconnect and leak heating coolant inside the passenger compartment
24V-924 Dec 11, 2024
Engine protection and inducement software may cause the engine to shut down unexpectedly
23V-737 Nov 2, 2023
Rear lifting bracket that attaches to the engine cylinder head may be insufficiently secured, which can allow it to detach
22V-554 Jul 29, 2022
Engine control module (ECM) may experience an internal short-circuit, which can result in an unexpected engine shut down