Jeep's diesel-powered Grand Cherokee is nearly here.

Jeep's long-awaited diesel-powered Grand Cherokee will make its United States debut in January at the North American International Auto Show in Detroit, the automaker's CEO has revealed.

Jeep President and CEO Mike Manley revealed to WardsAuto on the sidelines of the Los Angeles auto show that the Grand Cherokee diesel will make its first public appearance at the Detroit auto show next month. Rumors suggested Jeep might unveil the oil-burning Grand Cherokee in LA, but those reports obviously never came to fruition.

Jeep is keeping a lid on the Grand Cherokee diesel's specs until the start of the Detroit show, but is believed that the SUV will be powered by a version of Chrysler's 3.0L turbodiesel. Already on offer in the Euro-spec Grand Cherokee, the V6 diesel produces 224 horsepower and 406 lb-ft of torque.

Manley says the diesel-powered Grand Cherokee, which will be based on an updated version of the SUV, will hit dealer showrooms during the first quarter of 2013. Pricing remains a mystery, but Jeep could reserve the diesel option for top-spec Limited and Overland models.