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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

GMC confirms Hummer EV will be joined by an electric Sierra, or Sierra-like, pickup

GMC will step into the electric vehicle arena for the first time when it begins building the Hummer EV in 2021. While it's not planning on becoming an electric-only brand, it has more battery-powered models in the pipeline. "There will be an all-electric Sierra pickup, but no timeline yet. But, the plan is to make it electric; this whole electric thing is a moving target," Lynn Thompson, the president of a Buick-GMC-Cadillac dealership in Missouri, told the Detroit Free Press. He said executives revealed those plans during a national dealer meeting. What remains to be seen is whether the truck will be an electric variant of the Sierra as Thompson said, or if it will arrive as a standalone electric truck with Sierra-like dimensions and capabilities. Sister company Chevrolet is also planning to launch an electric pickup in the coming years, and it strongly hinted it will take the second route. Its entry into the segment won't look like a Silverado, and nothing seriously suggests it will be badged as one. It will also be interesting to watch how GMC ensures that the truck doesn't overlap with the Hummer EV, which will exclusively be offered as a four-door pickup with a relatively short cargo box when it arrives in stores as a 2022 model. Our crystal ball tells us the Hummer will be marketed as a more expensive model aimed at weekend adventurers who want to make a statement, while the Sierra-like model will be cheaper and primarily aimed at buyers who merely want a truck, whether they're commuters, contractors, or fleet operators. Chevrolet's entry into the segment will slot beneath these two models. General Motors used this strategy nearly 20 years ago to keep the Hummer H2, the GMC Yukon, and the Chevrolet Tahoe in separate corners of the same room. GMC's electric truck could share powertrain and chassis components with the Hummer EV. It might also be built in the same Hamtramck, Michigan, factory that parent company General Motors is funneling $2.2 billion into. Regardless of the path it takes, GMC is not going all-electric. "[GMC boss] Duncan [Aldred] said we're certainly not going to abandon our internal combustion engine vehicles because that's our core business, and that was good to hear. It's to let people know they're not going down the same road as Cadillac," a dealer who asked to remain anonymous said. Cadillac might go EV-only by 2025, starting with a crossover named Lyriq, and many of its dealers have refused to spend $200,000 on upgrades.

GM's MPG overstatement could affect 2 million vehicles

Late last week, GM admitted that three of its large SUVs fuel economy window stickers did not match their actual efficiency ratings, and so the vehicles couldn't be sold. The stickers on the 2016 Chevy Traverse, GMC Acadia, and Buick Enclave said their ratings were one to two miles per gallon better than they should have been. Officially, the number of affected vehicles sits at about 60,000. But Consumer Reports makes a good point: what's up with all of the previous model year SUVs that are basically the same vehicle? To wit: the 2016 model year vehicles are not substantially different than the 2015 or the 2014, or even going all the way back to 2007. On the EPA's fuel economy website, all of these older models will "have better stated fuel economy numbers than the new vehicles in GM's dealerships," Consumer Reports noted. CR's best point, and the one that makes the 60,000 number potentially grow to 2 million if all of the vehicles built on this platform are affected, is that "[i]t seems unlikely that the company would change the powertrain on these carryover models so late in their model cycles in a way that would cause a dramatic, negative impact on fuel economy." GM says that earlier model year SUVs are not affected and the EPA did not respond to CR's question about the potential for more discrepancies. We've seen automakers reverse course before, so if GM has to come out with a mea culpa soon, don't be surprised. GM is rushing corrected stickers to dealers so that the SUVs can be sold again, but a fix for the already-sold vehicles could be trickier to solve. Related Video: Related Gallery 2013 GMC Acadia View 16 Photos News Source: Consumer Reports Government/Legal Green Buick Chevrolet GMC Fuel Efficiency mpg gmc acadia chevy traverse