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Prevost H3-41 Recall 23V126: Fire Sensor May Falsely Trigger Sudden Engine Shutdown

NHTSA campaign 23V126, reported February 24, 2023, 555 vehicles potentially affected.

What this recall means for you

A fire sensor in the lower engine compartment of certain Prevost motor coaches and motorhomes may corrode and malfunction. When this happens, the Automatic Fire Suppression System can give a false fire warning, shut down the engine without cause, and release fire-extinguishing chemical into the engine compartment.

A sudden loss of drive power increases the risk of a crash. A disabled coach may also need to be evacuated in uncontrolled traffic, which raises the risk of injury to passengers.

Prevost will inspect the vehicle, install spacers between the optical fire sensor and its bracket, and replace the sensor if necessary, all free of charge. Owners who have not yet received the notification letter mailed September 8, 2023 can contact Prevost customer service at 1-866-870-2046 (recall SR23-05). Check your vehicle identification number for open recalls.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 23V126Prevost Car (US) Inc.
Component
EQUIPMENT:EMERGENCY:FIRE SUPRESSION:SENSORS
Problem
Prevost Car (US) Inc. (Prevost) is recalling certain 2018-2023 H3-45 motor coaches and H3-45 VIP motorhomes, and 2019 H3-41 motor coaches. The Automatic Fire Suppression System (AFSS) optical fire sensor positioned in the engine compartment's lower region may corrode and malfunction. In this event, the AFSS may give a false warning to the driver, command an unwarranted engine shutdown, and release a chemical fire extinguishing agent in the engine compartment.
Risk
The activation of the Automatic Fire Suppression System can cause a sudden loss of drive power, increasing the risk of a crash. Additionally, a disabled coach may require an evacuation procedure in an uncontrolled traffic situation, increasing the risk of injury to passengers.
Remedy
Prevost will inspect the vehicles, install spacers between the optical fire sensor and bracket, and replace the optical fire sensor, if necessary, free of charge. Owner notification letters were mailed September 8, 2023. Owners may contact Prevost customer service at 1-866-870-2046. Prevost's number for this recall is SR23-05.
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.

Affected vehicles

Prevost H3-412019
Prevost H3-45201820192020202120222023
Prevost H3-45 VIP201820192020202120222023