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GM recalls 3.8 million vehicles in North America due to braking issue

WASHINGTON — General Motors Co said Wednesday it was recalling 3.46 million U.S. pickup trucks and SUVs to address a vacuum pump issue that could make braking more difficult and that has been linked to 113 accidents and 13 injuries. The recall covers 2014-2018 model year vehicles, including some Cadillac Escalade, Chevrolet Silverado, Chevrolet Tahoe, GMC Sierra, Chevrolet Suburban and GMC Yukon vehicles. In late June, GM recalled 310,000 vehicles in Canada for the same issue. GM did not immediately explain why the Canadian recall occurred more than two months before it called back the vehicles in the United States. The recall was triggered because the amount of vacuum created by the vacuum pump may decrease over time, GM told the National Highway Traffic Safety Administration (NHTSA) in documents posted on Wednesday. The NHTSA opened a preliminary investigation into the issue last November, and said it had reports of nine related crashes and two injuries. It provided GM in July with additional field reports that prompted the automaker to open an investigation. GM said it could affect braking in "rare circumstances." The NHTSA said in a statement the "vehicles may experience brake boost failure, which would require increased brake pedal effort, leading to a hard brake pedal feel, and potentially increased stopping distance." GM said dealers will reprogram the electronic brake control module to improve how the system utilizes the hydraulic brake boost assist function when vacuum assist is depleted. GM said the vacuum assist pump, which is lubricated with engine oil that flows into the pump through a filter screen, can in some cases lose effectiveness over time, as debris such as oil sludge can accumulate on the filter screen. GM told NHTSA that prior model years used a different brake assist system design, and vehicles manufactured after 2018 were not equipped with the affected pump design. Separately, GM said on Wednesday it is recalling 270,000 additional U.S. vehicles in three smaller recalls, including 177,000 2018 Chevrolet Malibu cars with 1.5L turbo engines because an error in the engine control module software may result in the fuel injectors being disabled.

Chevrolet Malibu gets aggressive redesign for 2016

Cars like the Ford Fusion, Kia Optima and Chrysler 200 have recently raised the styling bar in the midsize sedan game is. In that regard, the rather anonymous Chevrolet Malibu has suffered in recent years. That no longer appears to be an issue with the 2016 Malibu, which is simply caked with interesting elements. The wide, aggressive grille, expressive headlights and angled LED running lamps make the Malibu look like the Impala's much angrier little brother. In back, the Impala inspiration is there, but like the fascia, it's noticeably more aggressive, with a sharper cant to the taillights and a pair of large, integrated dual exhausts (at least on the 2.0-liter, turbocharged model being featured by Chevy). Designers also worked to give the 'Bu a bit more character in the profile, adding a pair of character lines to cut back on the last-gen car's slab-sided looks. While the exterior could almost be described as sporting, the brown-and-beige color scheme in the cabin is noticeably more relaxed. A large, central MyLink system sits atop the dash, while drivers will also have access to a dedicated display in the instrument cluster. A thick-rimmed, three-spoke steering wheel is a bit on the large side, but still looks like a nice piece to work. You can read a lot more about the new 2016 Malibu in our original post from early this morning. But before you do that, have a look at our full gallery of live images from the floor of the Javits Center. All-New Malibu is Larger, More Technological and Efficient New hybrid sedan projected to offer combined rating north of 45 MPG DETROIT – Chevrolet today introduced the all-new 2016 Malibu – a completely restyled midsize sedan engineered to offer more efficiency, connectivity and advanced safety features than ever. An all-new hybrid powertrain, which leverages technology from the Chevrolet Volt, will help offer a GM-estimated combined rating north of 45 mpg. The Malibu's standard 1.5L turbo powertrain is projected to offer 37 mpg highway. The 2016 Malibu is also longer and lighter, with more interior space and improved fuel efficiency. Its wheelbase has been stretched close to four inches (101 mm), and it is nearly 300 pounds (136 kg) lighter than the current model. "Midsize customers tell us they want great fuel economy, connected technologies, wrapped in a gorgeous exterior. This is exactly what the 2016 Malibu was engineered to do," said Jesse Ortega, Malibu chief engineer.

How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.