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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.

2016 Chevy Colorado Duramax makes 369 lb-ft for $3,730 premium

Since announcing the new Chevrolet Colorado in late 2013, there has been absolutely no secret that the 2.8-liter Duramax diesel would wind up under the hood of the midsize pickup truck for the 2016 model year. It has been a long wait for those wanting the oil-burner, but thankfully, the anticipation is nearly at an end. Chevy is finally officially unleashing details about the four-cylinder, which churns out 181 horsepower and 369 pound-feet of torque. The diesel is available in both LT and Z71 Crew Cab trims, and there's the choice of two- or four-wheel drive. All come with a six-speed automatic gearbox with a standard automatic-locking rear differential. An electronically controlled two-speed transfer case comes on four-wheel drive models, as well. The Z82 trailering package also arrives on all of the Duramax pickups and includes an exclusive integrated trailer brake controller. The first shipment of diesels arrives at dealers this fall with a price of $3,730 on top of a comparably equipped version with the 3.6-liter V6. Customers opting for the Duramax are getting more capability from the Colorado. With a 7,700-pound tow rating on two-wheel drive examples (7,600 pounds with four-wheel drive), drivers can haul 600-700 pounds more behind the truck than its petrol V6 counterpart. Fuel economy numbers haven't been announced yet, but are expected to top the gasoline versions. The engine is also B20 bio-diesel compatible. Beyond being just a good hauler, Chevy is throwing cutting-edge tech into these models. For example, this is the company's first application of a Centrifugal Pendulum Vibration Absorber on the transmission's torque converter. The device is a dampener that cancels out torsional vibration from the engine for a more comfortable ride for occupants. There's also a driver selectable exhaust brake system that uses engine compression to help slow down the truck and reduce brake wear. You can read more about the nuts and bolts of the diesel in Chevy's press release below. Chevrolet Introduces Colorado Duramax Diesel All-new turbo-diesel expands lineup with unparalleled capability, efficiency DETROIT – The fastest-selling truck in the market now offers an available turbo-diesel engine. The 2016 Chevrolet Colorado Duramax diesel takes midsize truck capability and efficiency to unprecedented levels.

2018 Autoblog Technology of the Year finalists

After months of prepping and several days of testing, we narrowed the field for Autoblog's 2018 Tech of the Year award to the Nissan Rogue with ProPilot Assist semi-autonomous driving system, the Lexus LC 500h and its new hybrid powertrain, and the Chevy Colorado ZR2 and its trick Multimatic spool-valve off-road shocks. Three very different cars with very different technologies duking it out for the award. Look for news of our winner at the 2018 Detroit Auto Show. We hand out this award every year to the technology or feature that we feel moves the bar forward for the automotive industry. Read more here on how our testing process works. We discuss, debate and count up score sheets, judging each vehicle and technology on a few different criteria. Is its purpose noteworthy? Does it work well? Does it advance the industry? The Nissan Rogue with ProPilot Assist was actually a prototype, as the technology will first debut in the 2018 Nissan Leaf. Still, we're here to test the tech and not the car. ProPilot Assist combines adaptive cruise control system combined with lane-keeping assistance. The system uses sonar, radar and a number of cameras for some light semi-autonomous driving and enhanced safety. While these systems aren't new individually, Nissan's system is affordable, intuitive, and coming to a mainstream product — democratizing the tech in a novel way, if you will. That's why it's here. The Lexus LC 500h uses a new powertrain that Lexus has dubbed the Multi-Stage Hybrid System. Basically it combines two types of transmissions — a CVT and a four-speed automatic — in a single unit mated to a naturally aspirated V6. That's complex and unorthodox technology, and Lexus engineered it to give drivers the efficiency of a CVT without sacrificing driving enjoyment. The package is subtle, working in the background to create a nearly seamless driving experience. It's engaging in a way most other hybrids can only dream of. The fact that it's wrapped in such gorgeous sheetmetal only makes things better. The Multimatic spool valve shocks in the Chevy Colorado ZR2 might seem low-tech compared to ProPilot Assist and the Lexus Multi-Stage Hybrid, but they represent a completely novel application of a technology that several years ago was so expensive that it was reserved for top-tier race cars. Like the LC 500h, these shocks really change your perception of how a vehicle like this should drive.