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GM recalling another 2.7 million vehicles in five separate campaigns

The recalls keep rolling in from General Motors, evidently keen to avoid repeating the mistakes of the ignition-switch debacle and clean house. This time they're all coming at once, with five separate recalls announced together covering approximately 2.7 million vehicles.
The largest of the five actions involves over 2.4 million units of the previous-generation Chevrolet Malibu and Malibu Maxx, Pontiac G6 and Saturn Aura in order to fix brake light wiring harness, which have been found to be susceptible to corrosion. The recall is separate from the 56k Aura sedans which GM recently recalled over faulty shift cables, not to mention the previous massive recall of 1.3 million vehicles - some of them the same models - but appears to have resulted from the National Highway Traffic Safety Administration investigation that started with the G6 almost a year ago.
The second-largest campaign involves the 2014 Chevy Malibu, specifically those fitted with GM's 2.5-liter engine and stop/start system, approximately 140,000 examples of which has been found to have problematic brakes. The issue does not appear to be connected to the recall of 8k Malibu and Buick LaCrosse sedans (also involving brake woes) which we reported upon last week. Four crashes have been reported in such models, but GM admits it's not yet clear if the problem was a contributing factor in the accidents.

The new presidential limo is almost ready and way bigger than a Suburban

If you're familiar with the current presidential limo, which is nicknamed The Beast, you know it's based on a medium-duty truck platform. This new one, shown in aerial spy photos, appears to be just as huge. The vehicles flanking it in these shots are Chevrolet Suburbans, basically the largest passenger vehicle you can buy. And while the limo looks car-shaped, it's very tall and much longer than the three-row SUV. You might say it's yuge. Like its predecessor, The Beast 2.0 is being developed in secret because all of its various systems and defenses are matters of national security. We are fairly confident that it has lots of armor protection, glass that's about five inches thick, and special systems to clean the air in the event of a biological warfare attack. The current Beast is also said to carry a pint or two of the President's blood type just in case something does happen. When the President is being transported in a motorcade, he is at his most vulnerable, so Cadillac One and the vehicles that surround it have to be prepared for almost anything. In fact, two identical presidential limos travel together to make it harder for would-be attackers to do bad stuff. The Suburban escort it's getting here at the GM proving grounds is appropriate, since most of the vehicles used by the Secret Service to accompany the President's motorcade are big GM SUVs. By the looks of this camouflaged prototype, GM is nearing completion of testing the new Presidential car. The styling is a mix of CT6 sedan and Escalade, with a little XTS thrown in, and it looks a lot more sleek by comparison than the current blocky Beast. When it's ready, President Donald Trump will be the first to ride in it on official business and the current beasts will probably be retired and end up in a museum. Related Video: Featured Gallery Cadillac One Presidential Limo Spy Photos View 13 Photos Image Credit: Chris Doane Automotive Government/Legal Spy Photos Cadillac Luxury Sedan the beast cadillac one

GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging