1997 Chevrolet Silverado Shortbed Standard Cab Truck Red on 2040-cars

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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.

It's possible to go 111 miles on electricity in the new Chevy Volt

Wayne Gerdes at CleanMPG put the 2016 Chevrolet Volt in Premiere trim through a few closely watched on-the-road tests over a few days. One of them was a run from full charge to EV-only exhaustion, and at the end of the trip Gerdes had traveled 111.0 indicated miles on a single charge, 111.9 according to his Garmin. What's the catch? He guessed his average speed was about 20 miles per hour, which was 15 and 20 mph around town and "a few miles" at 50 mph on the highway. The EPA says the new Volt should go 53 miles on battery power. In the 2011 Volt, rated at 38 electric miles, Gerdes got 75.5 miles on a charge. The upshot is that at urban driving at average speeds should get drivers the EPA rated 53 e-mpg without fuss. He wasn't so impressed with performance in Charge Sustaining Mode, though. During one run that covered 101.2 actual miles in CSM, using 1.691 gallons, the Volt got 59.8 mpg. Speaking of driving in CSM only, Gerdes said it's less efficient here than in competitors from Toyota, Honda, and Hyundai, but that's one of the few performance-related complaints he had. Elsewhere around the PHEV, Gerdes liked improvements to the eight-inch display and rear-view camera, build and design quality, the much quieter ride, and the switch to regular fuel. The six-foot Gerdes found the cabin space still cozy, especially in the back where ingress and egress could be a challenge for people of a certain stature. He lamented the fact that he couldn't find instantaneous fuel and energy consumption or among the many readouts, and would prefer the sedan kicked into glide mode sooner. In spite of that, he declares the Volt II "a full blown electric car." Head over to CleanMPG for the rest of his assessment.

Chevy Trax engineer says GMC version possible

The Buick Encore is doing so well and its platform-mate the Chevrolet Trax has such good reviewer vibes going for it already, that a GMC version hasn't been ruled out. During the recent press launch, Automotive News asked lead engineer Al Manzor if the Trax could wear a GMC-branded suit, to which Manzor replied, "I think that is certainly possible." That's a long way from telling us anything about the probability of a GMC version of the Trax, and a legion of questions would need to be answered before it could happen. How would a GMC version be priced to leave room for the $26,465 GMC Terrain but not eat into sales of the $20,995 Trax or the $24,035 Encore? Or would that matter? Could it primarily be considered to encourage a new faction of The Yukon Set at the compact end, GMC buyers being famously committed to the marque? And of course, would there be a Denali version? It'll probably be a long while before we have any kind of answers, but if you want to see it happen, the door to your campaign of persuasion is at least ajar.