Engine maker begins major vehicle recall over faulty NOx controls

Engine manufacturer Cummins Inc. is voluntarily recalling over 500,000 medium- and heavy-duty trucks from model years 2010-2015 over faulty controls for nitrogen oxides (NOx), a move that EPA says is the largest ever voluntary truck emissions recall. The agency in a July 31 press release says the recall is due to defective equipment to control NOx -- known as a selective catalytic reduction (SCR) system -- and “does not involve a defeat device.” Defeat devices were at the heart of...