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GM opens official investigation into C8 Corvette transmission leaks

In March 2020, a month after Chevrolet began customer deliveries of the 2020 C8 Corvette, a GM dealer technician created a Reddit thread about a leaking gearbox in a Corvette with 32 miles. That car hadn't even been sold yet. Since then, as a search of "C8 Corvette transmission leak" shows, it's been tales of woe for some owners. Something in the Tremec TR-9080 transaxle in the back of the mid-engined Corvette doesn't work as it should, the fault able to cause codes that the transmission needs service, or that the driver needs to shift to park. In some cases, the battery would die because of follow-on issues after the initial transmission code, that code preventing the car from powering down. As Autoevolution reports, GM filed paperwork with the National Highway Traffic Safety Administration in August to look into what's going on. Between forum threads and GM's investigation document, there are several issues mentioned. The most common appears to be the dual-clutch transmission leaking fluid due to gasket failures like the one suffered by one owner at 858 miles, and another for an owner currently enduring a second leaking transmission. The Midengined Corvette Forum reported that Chevy engineers redesigned the TR-9080 pan, fitting Corvettes with the new unit at some point in the 2021 model year. The original pan was stamped steel unit affixed to the engine with two studs and 13 bolts, plus "reinforcement plates." The updated pan is said to be a cast aluminum unit affixed with two studs and 17 bolts, omits the reinforcement plates, and gets a new machined new groove around its edge to seat the gasket seal. The GM paperwork now at the NHTSA mentions a P1789 code, and says one reason for it could be "debris on the park position sensor magnet causing an incorrect position reading to the TCM." This might be caused by another issue mentioned in forums, which is clogged transmission filters. GM gives instructions for returning transmission filters to the company, and a poster on one forum said the Corvette tech at the dealer where he bought his Corvette told him the automaker "requires every used transmission filter to be returned to GM."  Whatever's going on, the problems haven't stopped, and they go beyond the P1789 code. Over the weekend, a 2022 Corvette owner posted on Corvette Forums that he got a check engine light on his car after just 850 miles.

2023 GMC Canyon revealed with new ZR2-based AT4X trim

Following up on the reveal of its twin, the Chevy Colorado, the 2023 GMC Canyon has made its appearance. Naturally, it shares much with the Chevy pickup, but GMC has gone to greater lengths to differentiate the truck. It comes standard with the high-output engine, all versions feature the wide-track suspension setup, and in addition to the now more luxurious Denali, there's a ZR2-based AT4X trim. As with the new Colorado, the Canyon gets an overhaul of the design. It's down to one bed and cab configuration (short-bed, crew cab), and it features a longer wheelbase with the front axle pushed forward. The Canyon does get a variety of unique design features, though. It has its own front fascia with a tall, rectangular grille. LED lighting is standard on all Canyon models all the way around. That includes the unique fender lights like those found on the Sierra HD. All Canyons also feature the wide-track off-road suspension like the Colorado Z71 and Trail Boss. There are no narrow-track, narrow-body versions, even on the base two-wheel-drive Elevation. That suspension also means all Canyons have a roughly two-inch lift over base Chevy Colorados. The GMCs also get standard 32-inch tires, and they don't feature a front air dam in order to provide better approach angles. The bed, while only available in one trim, is available with a unique storage bin in the tailgate. On the topic of suspension specs, the Elevation and AT4 trim levels have 9.6 inches of ground clearance. The Denali increases that to 10.5 inches, and the AT4X features 10.6 inches. It also picks up the Multimatic spool-valve shocks from the ZR2. But we'll talk more about what comes on the AT4X in a bit. Under the hood of the Canyon is just one engine. It gets the highest-output version of the 2.7-liter turbocharged four-cylinder. The engine makes 310 horsepower and 430 pound-feet of torque. The only transmission is an eight-speed automatic. Two-wheel drive comes standard on Elevation, and other trims come standard with four-wheel drive. The inside of the Canyon is very similar to the Colorado, but it has some unique cues. It has air vents that are more integrated into the squared-off dashboard design, rather than the Chevy's round vents. It has a differently shaped dash pad and trim surrounds, too. The really big differences come on the Denali and AT4X trims, though. The Denali features real wood trim with laser etchings. It also gets lots of real leather and fancy stitching.

2018 GMC Terrain Drivers' Notes Review | Summon the Druids, it's a better Equinox

We've had plenty of time in the all-new Chevrolet Equinox, testing it with all three of its available turbocharged four-cylinders: the 1.5-liter, the 2.0-liter performance upgrade and the diesel fuel economy upgrade. Finally, however, we get a turn behind the wheel of its brother from a different corporate mother: the 2018 GMC Terrain. This duo is certainly one of the most disparate pairings in GM's long badge-engineering past, with virtually no visual similarities inside and out. They're even less similar than the last Equinox-Terrain, which themselves were a far-cry from the Blazer-Jimmy days. They're largely the same under the skin, however, including their selection of engines. For the 2018 Terrain, we sampled the 1.6-liter four-cylinder turbodiesel good for 137 horsepower and 240 pound-feet of torque. It's an unusual powertrain to be sure, as no other compact crossover SUV in this country offers one (though Mazda has been threatening to do so for years now), but boasts an EPA-estimated fuel economy rating of 28 mpg city, 39 mpg highway and 32 mpg combined with front-wheel drive. It's basically the same with all-wheel drive. The as-tested price of the SLT Diesel was a rather hefty $39,605. It did, however, have most options, including the Infotainment Package II and Driver Alert Package II that together include all the extra entertainment and safety gadgets. Contributing Editor James Riswick: Let's be honest, the main difference between the 2018 GMC Terrain and its Equinox sibling is the way they look. As such, I can definitively say I prefer the Terrain. It's far more cohesive and better proportioned than the rather dumpy Equinox. It also avoids the garish over-adornment of the last Terrain even if the floating roofline D pillar has passed its expiry date. I think the interior looks better too. As for the way it drives, the 2018 Terrain demonstrates great improvements from one generation to the next. The steering in particular is greatly superior in its feel and feedback. Body motions are also kept nicely in check. Is it a Mazda CX-5 or Ford Escape beater? No, but it's far more confidence inspiring now. So that's the good. Now, the extremely bad. This diesel engine vibrates so much I can't imagine anyone taking one for a test drive and choosing it over the 1.5-liter gasoline turbo. You feel it through the wheel, the pedals and the seat of your pants constantly. It's particularly bad when stopped and even present when just cruising on the highway.