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How GM's grueling 24-hour test gets the kinks out of its performance cars

One of the biggest challenges automakers face when designing a high-performance car is making sure that it is both fast and reliable. For General Motors, any car that might be taken to the track by its owner - like the Corvette, Camaro Z/28 (shown above) and the Cadillac CTS-V, for example - undergoes a rigorous and strenuous 24-hour test by engineers at the Milford Proving Grounds, as pointed out by Car and Driver.
We've posted on this topic in the past - on a video showing the Camaro ZL1 being brutalized, for instance - but this article gives a more in-depth look at what actually happens behind the scenes... including what that poor ZL1 went through. Though the test isn't for 24 hours straight, the cars are pushed as hard as possible by some of GM's best drivers with only the brakes and tires replaced frequently.
We don't want to ruin the fun for you, but it is an interesting article that tells just some of what GM does to develop its sports cars. Check out the full article over at Car and Driver for the rest of the story.

Why GM will import the Cadillac CT6 PHEV from China

There's a clear-cut reason that General Motors is going to build its upcoming plug-in hybrid CT6 sedan in China. Sure, the car will be sold in China and the US, but the real reason for the "Made In China" stamp is environmental. If an automaker wants to build a new model in China, adding a green powertrain is an easy way to do that. The CT6 will have both a PHEV option as well as standard gas engine versions. David Leone, Cadillac's executive chief engineer, told AutoblogGreen recently that, "[China is] far more receptive to approving localized production of vehicle programs that have new energy vehicle powertrain applications." To put it succinctly, since the CT6 has a PHEV option, it is easier for GM to build all CT6 models in China. Some of them will then be imported to the US. "Most new global Cadillacs will also be produced in China as well. It's our second-largest market in the world." "To bring any new car into China, to produce it, you need government approval," Leone said. "The government isn't interested in bringing many new cars to market that don't have new energy credits. [The CT6] also provides new energy credits that enables it to be an attractive, well-received product in China." Leone said that there are two main markets for the various CT6 models: China and the US. The car will arrive in the 2017 model year, so some time after the end of June 2016. There are other practical reasons to build the PHEV in China, like the cells in the battery pack. Those are provided by LG Chem, which makes some cells in Michigan but more in South Korea. And GM already builds cars in China through its joint venture with SAIC, Shanghai General Motors, or SGM. "In February 2013 we started making the XTS, in summer of 2014 we started making the ATS-L," Leone said. "We will be producing [the CT6] within a number of months. Most new global Cadillacs will also be produced in China as well. It's our second-largest market in the world." The Chinese and US versions of the CT6 will be identical, Leone said. While some Cadillacs sold in China are slightly different than the US versions – the Chinese ATS is 77 millimeters longer, for example – the CTS6 PHEV will be exactly the same in both places, other than slight tweaks to the trim levels. Still, "more of our cars going forward will be the exact same car," he said. That doesn't mean that sales will be the same everywhere.

GM recalling Cadillac ATS, XTS, Chevy Impala over faulty brake lamps

General Motors has issued a recall covering 1,627 sedans over faulty brake lamps. Both the 2013 Cadillac ATS and XTS are affected by this problem, as is the 2014 Chevrolet Impala.
According to an official National Highway Traffic Safety Administration report, "the brake lamps may intermittently flash without the brakes being applied and the cruise control may disengage" on these vehicles. The report does not state that the brakes themselves are faulty, but rather that "if the brake lamps flash when the vehicle is not slowing, a following driver may not adjust vehicle speed when the vehicle is in fact braking."
This marks the first recall for the 2013 Cadillac ATS, as well as the recently introduced 2014 Chevy Impala. In late 2012, over 12,000 Cadillac XTS models were recalled due to a head restraint issue.