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GM pauses 3.0-liter turbodiesel production due to a supplier shortage

General Motors confirmed it has temporarily stopped taking orders for trucks and SUVs equipped with the 3.0-liter Duramax turbodiesel six-cylinder engine. It blamed the last-minute pause on a supplier-related shortage. Website TFL Truck first reported the news, and a representative from General Motors quickly confirmed it. The spokesperson explained the issue is due to a "temporary part shortage" and added that production will resume "as soon as possible," meaning the Duramax engine (which is called LM2 internally) is not going away permanently. Additional details are not available, so we don't know if the issue is related to the ongoing chip shortage. Rather than delay deliveries and create a backlog, General Motors is reportedly asking its dealers to encourage buyers who want a turbodiesel engine to instead select either the 5.3-liter V8 or the 6.2-liter V8, depending on the model selected. Both are gasoline-powered units. There's no word yet on when Duramax production will resume. The shortage affects several models, including Chevrolet's Tahoe, Suburban, and Silverado 1500 and GMC's variants of these trucks. Cadillac's Escalade is temporarily diesel-less as well. Heavy Duty variants of the Silverado and the Sierra are not affected because they're powered by a different Duramax engine with eight cylinders. Motorists seeking a full-size SUV powered by an efficient turbodiesel engine are temporarily out of options because the Tahoe/Yukon and the Suburban/Yukon XL had the segment to themselves. The Duramax was surprisingly popular, too: in May 2021, GM Authority reported that the turbodiesel straight-six represented 8% of Suburban sales and 6% of Tahoe sales. Installed in a rear-wheel-drive Tahoe, the engine returns 21 mpg in the city, 28 mpg on the highway, and 24 mpg in a combined cycle, figures that make the body-on-frame behemoth more efficient than the unibody, front-wheel-drive Chevrolet Blazer that's 20 inches shorter and approximately 1,700 pounds lighter. Related video: 2021 Chevrolet Tahoe 3.0L Duramax engine

Autonomous tech will drive motorheads off the road

While autonomous technology could make car travel much safer and more efficient — and automakers and marketers are salivating over the prospect of a "passenger economy" that could potentially generate $7 trillion by 2050 — those of us who enjoy driving are not so stoked. Experts have predicted that as autonomous vehicles are deployed in large numbers, human-driven cars eventually could be outlawed on public roads due to the carnage they create, which is currently more than 41,000 deaths a year in the U.S. alone and climbing. Such scenarios have driving enthusiasts envisioning a "Red Barchetta" style nightmare becoming reality, making Rush lyricist Neil Peart a clairvoyant as well as one of rock's most badass skin-pounders. But there could be a couple of refuges left for motorheads, and they won't be on public roads. As Popular Science's Joe Brown points out in a recent editorial, we're seeing a wave of vehicles being offered by legit mainstream automakers that aren't made for public roads. The poster child of this vanguard is the 2018 Dodge Challenger SRT Demon, which comes with a crate full of goodies that lets you turn the already formidable street-legal muscle car into a drag-strip dominator. Brown also notes that two out of five of the Ford GT's driving modes are for use on the track, "catering to the $450,000 machine's club-racing clientele." We're also currently enjoying the heyday of production off-road-ready pickups that kicked off with the Ford Raptor in 2009. The latest salvo in this escalating war of overachieving trucks is the Chevy Colorado ZR2 that can take on the likes of California's Rubicon Trail without issue. Brown also gives a shout-out to his magazine's Grand Award Winner, the Alta Motors Redshift MX, which "isn't even allowed on public roads" and is "meant for bombing around motocross tracks, big backyards and single-track woods trails." If you follow Brown on Instagram, you know that he's also a two-wheel aficionado, and he points out that sales of off-road bikes are leaving street machines in the dust. Sales of off-highway motorcycles rose 29 percent between 2012 and 2016, according to the ­Motorcycle Industry Council — compared to 6 percent for road-bike sales during the same period. "That's a nearly 400-percent drubbing," Brown remarks.

2014 Chevrolet SS makes its live debut

Chevrolet showed off the new 2014 SS in an airport hangar last night, its first rear-wheel-drive performance sedan in the US since the Impala SS from 1997. We'll have more to say about the SS later today, but this is the sedan that Chevrolet sees as the final piece in restoring its performance credentials. For those of you looking for a manual transmission, however, that wish will go unfulfilled - at least for now: the only two options buyers will have are the color and whether or not they want a sunroof.
We'll work on getting some more angles (in better light) today at Daytona International Speedway, but with fans seeing the car for the first time, we don't hold out much luck of getting a clear shot. So for now, enjoy the high-res gallery above.