Nissan will cease production of the diesel-powered Titan XD pickup after the 2019 model-year and will replace it with a gasoline-powered model, according to a letter sent to U.S. dealers last week. First reported by The Drive, the move comes less than four years after the 5.0L, V-8 XD was introduced in late 2015 for the 2016-MY.

Nissan has confirmed the move, noting preparation for the launch of the new, refreshed 2020-MY Titan and Titan XD Gas later this year.

In the letter to dealers, Billy Hayes, division vice president of sales for Nissan North America, said the deletion will allow the factory to focus its resources on a "stronger, more focused" Titan lineup.

"We are simplifying the Titan lineup to focus our efforts on models that maximize opportunities to attract retail customers in the market for a full-size truck," Hayes wrote.

Backed by a five-year, 100,000-mile bumper-to-bumper warranty, the 310-horsepower, Cummins V-8 XD delivers 310 hp, 555 lb.-ft. of torque, and a maximum towing capacity of 12,830 pounds.

The truck failed to help Nissan steal a significant number of customers from segment leaders Ford, Chevrolet/GMC, and Ram. Nissan sold 18,026 full-size trucks in the first half of this year, which equated to a 1.5% market share, while Ford sold 448,398 in the same period, according to Automotive News.

In his letter to dealers, Hayes said a "dramatically refreshed" Titan will make its debut at September's Texas State Fair.