US opens probe into Ram diesel trucks; engines could stall

U.S. safety regulators are investigating fuel pump failures in more than 600,000 diesel Ram trucks that could cause the engines to stall or lose power.

The probe covers Ram 2500, 3500, 4500 and 5500 heavy-duty trucks with 6.7-liter Cummins turbodiesel engines.

The National Highway Traffic Safety Administration says in documents posted on its website Monday that it received 22 complaints and two field reports of engines stalling due to highpressure fuel pumps failing. Agency documents say it has no reports of crashes or injuries.

The agency says a review of the complaints found that the engines stop above 25 miles per hour, disabling the trucks.