2015 corvette stingray z51 - 8 speed automatic transmission torque converter. With only 7,500 miles on the car it started to run jerky and rpms would fluctuate for no reason (especially at highway speeds when fully warmed up). Often felt like driving on a washboard dirt road. After a cold start, there was a delay after shifting into drive. When it engaged after several seconds it would do so violently, lurching the car forward suddenly. Dealer diagnosed faulty torque converter as defective and a known problem with these transmissions. After less than 2,000 miles the symptoms returned and the dealer again replaced the torque converter. So now I'm on my 3rd defective tc. After 1,700 miles, symptoms returned again! Dealer said that chevrolet and gm have ordered a stop on replacing the tc's since no fix was available. Gm advised to drain and flush tranny, refilling with mobil1 transmission fluid. This seemed to work (only for a little longer) but is worrisome because in the future service, a technician will likely refill with gm fluid, not mobil1. Especially if a second owner. Now at 16,100 miles the symptoms are returning! Jerkiness, slamming into gear after a delay on cold starts. Gm seems to have turned their back on stingray owners by kicking the can down the road beyond warrantee (with the mobil1 "band-aid fix"). On the forums there are so many owner complaining about this same issue. I am amazed that there is no official investigation resulting in a recall. This z51 lt3 stingray was $75,000 otd! For this cost we should be able to expect a quality vehicle and a motor company that stands behind it! Can somebody please help us with this serious and potentially dangerious problem?
2015 Chevrolet Corvette transmission complaints
Page 2 of 2: complaints 11 to 18 of 18, newest first, as owners wrote them.
I had my vehicle serviced at dan vaden chevrolet in savannah, ga on 16 oct 2017 at (12,200 miles). My main concern was a shudder and jerky motion the car starts demonstrating while in motion, accompanied by fluctuating engine rpms. After researching on the internet there are 1000's of issues with these torque converters and who knows what accidents these failures have caused. There should be a total recall on these transmissions. A service department technician test drove my vehicle and confirmed and documented my concerns and stated it was okay to drive ? I am scheduling another service at (13000 miles). A search of the internet will fill you full of facts on these failures. Problems with the torque converters with these high end vehicles are well on the way to become another corvette issue of epidemic proportions. Please assist.
Please see snip from http://corvettec7fiasco.blogspot.com/2016/02/thousands-of-2015-and-2016-chevrolet.html thousands of 2015 and 2016 chevrolet corvette c7 stingray and c7 z06 with defective 8l90 8-speed automatic transmission, with no help from general motors for the owners back in 2014, this blog predicted a variety of problems related to then upcoming 8l90 transmission, one of those sounding on paper ideas, as long as the execution delivers on the promises. So far, the variety of problems related to the new +general motors 8l90 eight speed automatic transmission was already mind boggling: from expected overheating issues, failing flex plates, variety of leaks and software related issues, all the way to right down scary cases of transmission voluntarily "inspiring" new corvettes to rev up and attempt to take off. However, what was missing were the problems with the torque converter. Apparently, this is no longer the case and in fact, the torque converted problems are well on the way to become another corvette issue of epidemic proportions, further eroding already weak faith the hardcore corvette buyers may have in +general motors and the ever popular +tadge juechter . As expected, the undersized and high spinning torque converter issues manifest themselves in a shudder and jerky motion the car starts demonstrating, accompanied by fluctuating engine rpms. However, here lies the big problem: the same symptoms can be easily associated with the ever popular afm forcing the newest corvette into 4 cylinder mode. There are 1000's of issues with these torque converters and who knows what accidents these failures have caused. My car is in the shop for 1 week for the repair, thank god it was covered by warranty.. There should be a total recall on these transmissions.. A search of the internet will fill you full of facts on these failures.
Automatic a8 transmission has the following issues: 1)morning shift from reverse to drive severely delayed, bangs in eventually. 2) erratic shifting in normal traffic 3) the 2-1 downshift when coming to a stop results in severe bang, lurches forward and is very unsafe in a parking lot situation. Also in stop and go traffic, same lurching forward. Feels as if someone hit you from behind 4) torque converter lockup in 5th and 6th gear. Dealer tore apart the car to replace the stator, performed software update - neither solution worked.
The a8 automatic transmission in the 2015 corvette is prone to occasional hard downshifts from 2nd to 1st gear when driving at slow speeds (less than 10 MPH). Sometimes the downshifts are so violent that the car jerks forward several feet. The first time it happened I thought I had been rear ended by another car. The unpredictable behavior of the transmission is especially dangerous in proximity to pedestrians or other vehicles.
Automatic 8 speed transmission had to be replaced at 2000 miles on the odometer due to hard shifts and shifting automatically to low gear at highway speeds nearly bringing the car to a stop in interstate traffic, now 700 miles and 4 months later the transmission is stuck in second gear and you cant drive fast enough to get out of the way of traffic. And I know of several other cars like it that have similar problems. This is a real safety problem and gm seems to ignore it, probably until someone gets hurt or killed.
8-speed automatic transmission always shifts erratically when starting out cold (lazy shift, slow shift, etc.) and occasionally does not downshift when car comes to a stop, only to slam hard into 1st when gas pedal is pressed to resume travel. Dealer says gm claims this is "normal," but no car I've ever owned behaves like this. Appears to be fluid starvation internally. Any fix/replacement would be costly for gm, so given their history w/faulty ignition switches, not surprised they're trying to avoid it. Transmission is definitely not normal and behavior is unpredictable + unacceptable -- especially at this price. When car is moving & transmission is in drive and trying to lazily shift gears, you temporarily lose ability to apply power, which is both dangerous and unnerving. Clearly, this transmission was put into production w/inadequate testing & development. A recall is necessary to fix properly.
8 speed automatic transmission down shifts at a stop with such force it feels as you have been hit from behind by another car while coming to a stop. Transmission also will not always engage properly and will over rev and slam into gear possibly causing an accident. Transmission at times will disengage while going forward then slam into gear with great force. I was told by a gm insider that gm is aware some transmissions are defective and is working on a kit to fix the fluid starvation problem internally but has done nothing to inform owners of the potential dangers of erratic shifting that it's causing while driving. This also causes the transmission to over heat and to illuminate a warning lamp.
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