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GM faces possible class action lawsuit over 8-speed transmission

General Motors has been hit with a class-action lawsuit from owners who allege the eight-speed automatic transmission found in several rear-wheel-drive Chevrolet, Cadillac and GMC models between the 2015 and 2019 model years has a defect that causes the vehicles to hesitate and jerk when accelerating or slowing down. The lawsuit was posted to ClassAction.org and spotted by GM Authority. Problems with GM's Hydra-Matic 8L90 and 8L45 transmissions have been well-documented on Internet forums and via complaints filed with the National Highway Traffic Safety Administration, with many reporting damage to their vehicles. The lawsuit was first filed in December in U.S. District Court for the Southern District of Florida but appears to have been transferred recently to New York. Autoblog sought comment from Theodore Leopold, the lead attorney for the plaintiffs. "These transmissions have a common defect," the complaint reads. "Drivers attempting to accelerate or decelerate their cars feel a hesitation, followed by a significant shake, shudder, jerk, clunk, or 'hard shift' when the vehicle's automatic transmission changes gears." The problem also occurs when the vehicles accelerate in a single gear, without shifting, the plaintiffs allege. "Drivers have reported that the shift is sometimes so violent, they feel as though they have been hit by another vehicle." The problem is believed to center on the transmission, torque converter or both. The complaint says it causes undue friction, causing hydraulic systems and gears to function improperly and sometimes leaves metal shavings throughout the transmission, leading to costly repairs and replacement of parts or the entire transmission. It says GM has known about the problems since shortly after it introduced the transmissions, and has issued 13 technical service bulletins, none of which have resolved the problem. GM declined to comment on the lawsuit. The plaintiffs say GM should have warned consumers about the issues and covered repairs under each vehicle's three-year/36,000-mile bumper-to-bumper warranty. They're seeking statewide classes in at least six states: California, Florida, Illinois, New York, Oklahoma and Texas.

2017 Cadillac XT5 First Drive

Thousands of feet above the Pacific Ocean, the winding roads that lead to the summit of Palomar Mountain turn from undulating curves to tight, blind, hairpin bends. Most drivers along this route are looking for a chance to exploit the limits of their cars' handling as much as one can on public roads, while taking in the bucolic views and endless blue skies. Up here, taking the thrilling curves at high speed is best left for drivers of performance cars who have platinum health insurance, lest the possibility of rolling a vertical mile toward Hellhole Canyon Preserve (we are not making this up) is not a deterrent. How different the experience is when you've chosen to climb the mountain in the 2017 Cadillac XT5, the crossover that replaces the SRX in a growing lineup of refined and redefined XT-named utility vehicles. An instant reminder that this SUV is not a Lotus comes as we enter a corner with a smidgen too much gusto, the tires begin to claw for traction, and the seatbelts tighten with the grip of sudden death. A quick tap of the brakes releases the belts, but not before a bead of sweat forms on the forehead. The overwhelming feeling is one of being unsure if this exercise is out of the XT5's comfort zone, despite Cadillac's goal of hitting the high-achieving sweet spot of the sport-luxury crossover segment. You'll know that an XT5 isn't an SRX when you first see one, although the differences are harder to tell when the two are parked side by side. The XT5 is the second Cadillac model to arrive since the brand learned to speak with a New York accent (albeit an affected Soho dialect) and it's a key pillar to the brand's chances at worldwide success. In 2015, the final year of sales for the five-year-old SRX, Cadillac managed to sell almost 100,000 of them around the world – no small feat for a model about to be replaced, and proof of the crossover's relative freshness and its popularity in export markets like China. Like the SRX that precedes it, the XT5 will be available with either front- or all-wheel drive (a $2,645 option), but that's one of few commonalities with the outgoing model. A new, lighter chassis helps the XT5 shed about 300 pounds, although Cadillac favors high-strength steel for bodywork and leaves aluminum for the engine and interior trim. In line with the revised brand guidelines for naming, SRX evolved into XT5, leaving room for larger and smaller utility vehicles to eventually join the lineup.

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