Campaign 22V-438

Engine control module (ECM) may set a fault code that results in an unexpected engine shut down

Defect summary

Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2023 Thomas Built C2 Saf-T-Liner school buses equipped with 8.8L LPG engines. The engine control module (ECM) may set a fault code that results 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

Dealers will update the ECM software, free of charge. Owner notification letters were mailed October 28, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL942.

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 22V438000. Text as published by NHTSA.

Vehicles covered

One product line is 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-438
Make	Model	Model years	Complaints on this component
Thomas Built Buses	Saf-T-Liner C2	2020 to 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

23 service bulletins on this component came first

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