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GM alerting truck and sedan owners to a do-over on brake recall

A recall campaign intended to address issues with braking systems on certain 2019 General Motors trucks and sedans may have introduced a new issue, the automaker has acknowledged, and thousands of owners driving repaired vehicles may need to return to their service departments for another update.  The update addresses a fix that was pushed out to owners of more than half a million brand-new GM trucks and sedans that could potentially lose partial braking function, according to the Detroit Free Press. The original software fix helped address situations where the vehicles' anti-lock braking systems would become disabled, which in turn would prevent electronic stability control from activating. Vehicles subject to the recall would often experience software glitches that prevented them from properly communicating the operational state of these systems, meaning drivers would have no idea that their brakes may not behave as expected in an emergency. The 2019 Chevrolet Silverado 1500, Cadillac CT6, and GMC Sierra 1500 were all recalled in the original campaign.  Unfortunately, the early version of this fix appears to have introduced yet another software glitch, indicating that the original fix did not do the trick. Those who have not yet had their cars serviced can rest easy; they will only receive the most up-to-date version of the software fix.  Related video    

Cadillac plans new branding campaign to go with new products

Cadillac's new leader says the GM luxury brand now has "thousands of people" working on its behalf back at its soon-to-be new headquarters in the Detroit suburb of Warren, with a new branding campaign under development and plans to fix longstanding quality issues. Cadillac President Steve Carlisle granted an interview with the Detroit Free Press in which he said he'll unveil a new strategy to redefine the luxury brand, which he's calling a "master brand," in the first quarter of 2019. "Cadillac has its own values — boldness, optimism, innovation, sophistication — that will reflect in the master brand," Carlisle told the outlet. The challenge is "how to bring those to life." He added that Caddy won't be defining itself simply as a viable option to gold-standard Germany luxury cars. "We're targeting customers versus competitors. Cadillac has to have its own persona and not be defined by where other brands are and are not. It has to have its own definition and that's what we're reflecting in our master brand." Carlisle, who was promoted to lead Cadillac in April, put his first stamp on Cadillac last month when the brand announced it will move its headquarters back to Warren, Mich., across the street from GM's massive Tech Center, after more than three years in Manhattan's SoHo neighborhood. He said its Cadillac House showroom, a ground-floor space used to display models and stage events with partners, will remain open "for the time being" and that the brand will use what it learned well outside of its Detroit auto-industry bubble to move the brand forward. He'll have his work cut out for him. Cadillac plans to launch a new or redesigned vehicle every six months for the next three years, and Carlisle said he wants the brand to be GM's technology leader, the first to deploy self-driving and electric-vehicle technology of GM's stable of brands. Yet the brand just ranked second-from-last in Consumer Reports' new reliability survey for 2018. Jon Linkov, deputy auto editor for CR, said the brand suffered for widespread complaints about its Cadillac User Experience infotainment system, with owners reporting frequent crashes, frozen screens and problems with voice control. "Most of (the complaints) really ran through the CUE system being a major culprit for Cadillacs," Linkov said. Through September, Cadillac's year-to-date sales had dipped a half a percentage point from the first nine months of 2017 to 113,240 units.

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