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wow, certainly wasn't expecting a reply from GM on this. Kudos to you guys for monitoring the forums! I just sent the email as requested.

I have an appointment to drop the car off with my dealer on Wednesday morning, 3/22. Will update this thread once we know more. Hopefully a simple and quick fix.

 

Hey all. I'm in AZ as well. Glad I found this thread. I picked up my 23 Anniversary Edition Day after Xmas. Merry Xmas to me right. I was thrilled... then starting driving. I had this shudder at 1800 RPM when under load no matter what driving mode I was in including Manual or Auto. First trip to dealership in Jan took 1 week of back and forth with GM Engineers as they will not let Dealerships do anything on the Vette without checking with them. After 1 week they decided to Flash the TCM and sd it was fixed no more shutter. Again I was like WHEW! Then on drive home I quickly knew the problem was not fixed. Same exact shudder at 1800 RPM. So frustrated... Next trip to dealership 2.5 weeks as GM decided they needed to replace the transmission. $21,000 later .. Covered of course by warranty ...They say All fixed. Im hopefully considering the down time and full replacement. Well here we are today 3/21/23 after I drove around this weekend still has the shudder just not as bad it seems but set appointment Monday. The car has been in for same issue now 3 times and already 23 days total. Here comes the Lemon Law game I thought I never would have to deal with. If if it becomes an Engine issue that will def take more than 7 days. I have been back and forth with the Corvette Customer service and tried to get reimbursed for car payment already and they refuse since the dealership paid for a rental. Yeah.. A KIA isn't quite the same as a C8! They still refused. I also will try to give you update on next steps they take. You pay over $100K for a car you expect ZERO Problems! Its just a Chevy in the end I guess. Next step BBB Auto Line.

 

Sorry to hear of the issues, its super frustrating and especially to get a car back and its like they didnt even check it! Reference my problem above and the solution, the bad cam magnet as that fixed it in my case and I had no cel or any other symptoms. Just stinks the entire back of the car comes apart and engine gets dropped.
I need to take mine back, when they pulled the engine, for some reason my exhaust is not lined up and its strange as its not even adjustable! One side the tips are tucked in and the other side they stick out too far. It also has a really bad ticking over 60mph when it goes into v4 mode that was not there before they pulled the engine. Just hate giving the car up and it dealing w/ it all but I need to. Im going to change dealerships for sure. Im with you on the lemon law, I had to get an attorney involved on another GM product and have it bought back but my advice is, if you love the car and can take the emotion out of it, get it fixed and carry on. Easier said than done I know. While mine was in the shop I was shopping for P cars and if it had not come back fixed I was going that direction. Keep us posted.

 

I have tried driving in manual also and it didn't have any effect on my issue. I'm taking mine to the dealership this morning. Have a feeling she's going to be there a while.

 

Once they determined mine was the cam magnets and it was the timing causing the stutter, they had to order the parts in which took a week or so. I brought my car home during that time. The actual time once they had the parts, to remove the engine and trans and put it all back together was 4 days. So you should have your car until they have the parts come in, its the actual diagnosing that seems to take time dealing w/ GM corporate since no CEL tells them what is wrong.

 

Plan on it and keep track of all time spent at dealership. Be sure to start a conversation w Corvette customer service. They will issue a case # and stay in touch with you and dealer.

 

Well I dropped it off yesterday. Took their lead tech on a drive and thankfully the "stutter" occurred and he could experience it. I did mention MikeinAZ's issue, and he did seem to think that whatever it is is most likely engine related.

I did get a case number from GM customer service and they have been in contact with the dealership as well.

So now we wait. Hopefully not too long. On a positive note, they have the parts to get my rear parking assist going. LOL I was one of the 2022s that came without it due to a chip/part shortage.

 

Now the back and forth with GM engineers starts. Anxious to see what they try.. TCM flash...Tranny replacement....Engine.....

 

Just got a call from the dealership. They believe it is the camshaft position actuator magnet just as @MikeinAZ mentioned. Evidently there is a technical service bulletin out on this already.......https://gm-techlink.com/?p=16183 They have to get the part in hand and then they are saying it is about 10.5 hrs labor to change the part.

 

THX for the bulletin.. I sent to my service guy for my apt Monday. I'm sure it wont matter as they still will need to contact GM but this sounds like my issue for sure. Especially since they already replaced tranny and still has issue.

 

it's strange they replaced the transmission, I put mine in neutral and reved it and it stuttered and missed. I knew that pretty much ruled the trans out but GM has done some strange diagnosis for me over the years.

Had a seat that clicked in a Tahoe, after about 15 visits to the dealer a gm engineer decided the door hinges must be replaced! Even tho when you sat in the seat the clicking stopped. I begged for a new seat when nothing they tried to do worked. After the hinge episode I enacted the lemon law rule but my point is, I'm shocked at some things they do that are obviously not the fix.

 

Dropped mine at dealership 3rd time now. I sent the advisor the bulletin about the camshaft issues. Now I just wait to see what GM wants to do. I will be starting my case on KBB AUTO LINE today. The GM Chevy CS even advised me to do that shockingly.

 

Update: GM is telling dealership to replace the Transmission Valve body... interesting I've never heard of this issue and know they cant tear into the transmission. If this is outside the tranny and it fixes it I hop they don't put someone else through replacing the whole transmission to find out it is just a Valve.

 

A transmission stutter and an engine stutter feel completely different. Did you ever put it in neutral and rev it up to see if you could replicate the stutter?

I hope this fixes it but the symptoms described were more in line with an engine stutter. Gotta trust the dealer to some point....we'll see.

 

Does this stutter issue happen with lite throttle, cruising speed, between 5th and 6th gear by any chance? I've been getting some hesitations like the trans and engine are trying to decide what to do next. Go into V4 mode or upshift.

 

My engine stutter and bad cam magnet diagnosis had symptoms like it was missing at partial throttle, surging, bucking like a vacuum leak almost. At full throttle it would not do it, only partial throttle and at idle it would hunt around and idle high.

 

My issue sounds identical to what @MikeinAZ described. For me it seemed to be worst at light throttle around 2000ish rpm. Parts to replace my cam magnet arrived yesterday so with any luck they will have finished with my car by Thursday evening.

 

Just to RECAP. My issues started from Delivery. SHUDDERS hard at 1800 RPM in any mode any gear. Only while driving with a LOAD. Meaning you have to be going up a slight incline. Not down hill. Does not shudder if just running engine at 1800 sitting still..1st week at dealership to flash the TCM and update . Did nothing... 2nd trip to dealership They decide to replace the transmission as apparently can not open it at all.to fix. 2.5 weeks later and $21K , paid by warranty, Still had same issue.3rd trip to Dealership replacing the transmission did nothing so now GM tells them to replace the Valve Body.... Im like but wait.. You sd you couldn't do anything on the transmission now they want you to replace the Valve body which is in the transmission. Plus WTH would that be the issue unless you are saying that was also the issue in the first transmission but you replaced the whole thing instead of just trying the valve body first...before tearing the whole car apart to replace the whole transmission! Next question.. When this doesnt fix the issue what are you going to do??? Replace the Engine! At this point it is at 29 days...Lemon law here we come! What a pain

 

I just don't understand how they seemingly have misdiagnosed this from the start. The bulletin is out there on the cam magnet issue now and the symptoms are different than a trans problem. Running the car in neutral tells you everything you need to know to differentiate the problem area. Talk to the service manager about the timing issue being the problem and ask them to put the car on a rack, in neutral and watch the problem continue to be duplicated, eliminating the trans theory. Plus they can watch the timing, my service guy said they could see the timing off and once the cam magnets were replaced, it straightened right up. I dont know the exact terms to tell you to ask them to do but that's the gest of it. Those two things should get them on track or suggest it to GM. Keep us posted.