A number of heavy-duty Ram pickup trucks are being recalled by Fiat Chrysler Automobiles, which is now part of Stellantis (STLA), because they can catch on fire.

The recall affects over 19,000 trucks, including certain 2021 Ram 2500, 3500, and 3500, 4500, and 5500 Cab Chassis models that are outfitted with a 6.7 L turbo diesel Cummins engine.

The issue with the trucks stems from heater electrical relays that can short out, and in rare instances, cause a fire. The fires can ignite even when the truck’s engine is turned off, the company said.

In a statement posted on the National Highway Traffic Safety Administration website, FCA said, “A vehicle fire can result in an increased risk of occupant injury and/or injury to persons outside the vehicle, as well as property damage.”

The automaker said it is aware of three fires from the heater problem but has not had any reports of injuries. None of the fires involved consumer vehicles.

The affected trucks are thought to have been built between August 2020 and Jan. 8, 2021. FCA introduced protective tape into production following this time period, it said.

Fiat Chrysler does not have a repair for the Ram trucks at this time and is currently developing a fix. The recall is expected to begin on April 30.

Questions about the recall can be directed to FCA US customer service at 1-800-853-1403.

Shares of Stellantis were trading at $16.83 as of 12:11 p.m. EDT on Wednesday, up 20 cents or 1.23%.

Ram A Ram pickup is pictured at Criswell Chrysler Jeep Dodge in Gaithersburg, Maryland, in September 2012. Photo: Reuters