Well here we go again…

Codes P284E and P7000. Got the dreaded “idle creep temporarily disabled” message while driving the car normally. Car runs fine. Anyone with thoughts or input on the two codes? This Vette that replaced my lemon I bought from Fremont Chevrolet just 2 months ago threw these at 3000 miles. Fun times right? I think I’m about done with Corvette. 300 miles from home on New Years. TWO brand new corvettes. Two with faulty DCT issues. Brining the car into Fremont tomorrow. I am so done with this S$&t. It took 3 weeks for the buyback on the first one. Who knows what in the hell happens now? Yes I woke up with a darn anxiety attack this morning. Almost 180k worth of Corvettes in 2 months turning into lemons…. I just want the nightmare to end at this point. I already missed work and had to take PTO dragging this car down there, almost stranded my partner and I 300+ miles from home… the whole experience has just been abysmal. I wish to God they’d figure out these DCT issues. It’s going to kill the Corvette brand at this rate. I really hate saying that too. Loved my car.



Update 1: While sitting at In N Out eating on our roadtrip back home, I got back in the car and the CEL cleared itself and never came back. Still taking the car in tomorrow due to it being DCT related.

Update 2: Car is in service and they are inspecting it. CEL did not return and shifts were normal when driving. They are thinking it might be software related. Will keep you all updated when they know more.

Update 3: Car is trying to pass diagnostics. We are thinking it’s the transmission fork sensor itself that took a **** if it doesn’t clear and pass. Code was stored in history but we’re not seeing anything else aside from the P284E. If it’s just the sensor I’ll count myself lucky.

Update 4: CEL was caused by a failure of the Manual Shift Detent for gears 5-7. Service requires the transmission drained, cover panels to be removed, transmission mounts removed, and the part replaced.

Update 5: GM wants to replace the entire transmission

Update 6: Fremont has started the buyback process with GM. My claims agent from the first buyback is aware of what’s going on. They are now looking at getting me into a Z06 as this will be my third replacement C8 in 2 months.

Update 7: My service advisor texted me and Engineering confirmed the transmission will need to be replaced. It failed the relearn multiple times and that’s that. Bunk DCT at 3000 miles. Parts alone for the new transmission are 2-3 weeks out + so that makes the car an automatic lemon under CA law cause it’s going to sit for more than 30 days. I have started the buyback claims process with GM. My claims agent is handling it again same as the previous buyback. They got all the information and are planning on expediting the process so they can get me into a Z06. They’ve never heard of two buybacks back to back for faulty transmissions on Corvette’s… it’s just never happened before I guess which makes my situation strangely unique in the most unwanted way possible. The next step is for me to be patient while they do their magic and hope Fremont sources a trouble free Z06 in the meantime.

Update 8:

Wow it's amazing how fast a repair can be done when they don't want a car to fall under California Lemon Law. The transmission arrived 2 days ago and they are trying to have the car test driven by next Wednesday and released back to me. Fremont stated before they were going to buy the car back, but who knows now? GM said they will make a decision about the buyback on the 21st. My guess is they will try to deny the buyback and send me on my way. I also verified with the service tech that the transmission is an actual new transmission and not a rebuilt. Frankly, I purchased a new car. Not a newly repaired car, and I don't like being GM's test mule when it comes to transmissions. Another thing that comes to my mind is what about resale value? Who is going to want to buy a C8 when it needed a new transmission at 3000 miles?

Update 9: Buyback was approved by GM.

Update 10: Fremont Chevrolet stole 13k worth of my original down payment and never fully transferred my down payment of $44,500 onto the second C8. Instead, they TRADED the lemon against the second service contract and pocketed my money. Just discovered it now.


To recap:

My first 2024 C8 Corvette had a bunk transmission off the showroom floor and had to be bought back under California Lemon Law:

https://www.corvetteforum.com/forums...ty-new-c8.html

And my now second replacement C8 is having to be bought back for the same exact issue at 3000 miles not 2 months later for DCT related problems. Take my experience with a grain of salt when making your C8 purchasing decisions, but looking back now I never would have touched a C8 had I'd known the hell I'd now be going through.

Your mileage may vary. But DCT issues can occur anywhere between 0 and infinity miles. Because I seriously doubt any of these DCT's will even make it to their expected lifespans at this rate... sigh.

 

Again, WHERE is Chevy on this Forum ro WXPLAIN what the heck is going on with these trannies SO FAR INTO this product series? Is it their vendor's QC process and Chevy doesn't care - or what?

I know we are only hearing about those WITH the problem and many others have none - but still - seems like a high failure probability!

 

When my '22 Z51 HTC had 300 miles on the odometer I got a CEL and "idle creep disabled message." DTC's 0700 and P2854 [solenoid]. Car ran fine and the CEL cleared itself later that day. I figured it was a fluke and did not take car to the dealer until I had my "first service" at 7,843 miles. Car drove fine at all times and the problem has not returned. Now have over 36,000 miles on the car and all systems go. Hopefully your situation is minor. Good luck.

 

I had the same error pop up on mine out of the blue a couple months back, a 2021 HTC with ~5500 miles on it. Happened on a cool morning before I even got out of my neighborhood. Drove and shifted very rough and refused to shift past either second or third gear, can't remember which. Immediately took it back home. Took a couple weeks to get time to take it in to dealer. Tried driving it a couple days after the error happened and it drove and shifted just fine that time, but CEL remained on for that trip. Little over a week later, got it scheduled for service. Got up that morning to take it in, and it drove fine again, plus the CEL was gone this time. Took it anyway, and they ended up replacing the valve body. I've driven it a few hundred miles since getting it back and it has been fine...seems to shift smoother and quieter than it did before as well.

Good luck with yours...especially after all you've already been through with the first one!

 

Sorry to hear about problems with the second C8. One can only hope it was just a glitch in the system since it has not come back, but wise to get it checked out just in case.

 

The DCT issues are the one and only reason I havent gotten back into a C8. My 2022 was flawless for nearly 2 years, but I only put 7k miles on it, so who knows what happened after I sold it.

It's a damn shame that with prices falling I cant pull the trigger on a hysteria purple one purely because of the ongoing DCT stuff. It's pretty hard to imagine that the % of all DCTs with issues is in the single digits at this point.

Maybe it's just over sensitivity of all the sensors in them. Maybe GM should just yank all the sensors out and let the thing run.

 

I wouldn't give up on the Corvette brand just yet, the latest CEL may prove to be nothing but a fluke

 

I had one instance where the transmission skipped the even gears while slowing down at a red light. When I took the car out of manual mode and put it in drive, the transmission shifted normal. No DIC message or engine light ever came on. I hooked up a code reader and one of the transmission solenoids had set an internal code. I took my car to the dealer and after their diagnosis, it was determined that the valve body needed to be replaced. The point I'm trying to make is that even though a DIC message or check engine light goes away and the transmission appears to behave normally, don't think the transmission doesn't have a problem.

Update: The internal code was a P2856 - Clutch 'B' Pressure Charge Performance. Like I said, there was no DIC message or Check Engine Light. The only way I found it was with a code reader.

 

People will say these are isolated issues and the majority of the cars are trouble free- matters not when youre in service forever. My service issue was escalated to executive referral and now they can speak with the SA who never calls back. I month no car

 

I have a 24 stingray, 3300 miles so far and no issues. But after reading of so many problems, I’m wondering if I will take it on a long trip. Last thing I need is being 1000 miles from home and have a car that’s broke down.
And yes, I know that a high percentage of vettes don’t have a problem, but it seems an unacceptably percentage do have a major problem.
The unreliability of a $70-100,000 car is totally unacceptable.

 

Damn, that has to be infuriating on ANY new car, let alone an expensive one such as the C8........cars are so governed and controlled by electronics nowdays, it's scary.....

I hope this was just a blip for you and not a reoccuring issue.

 

These "DCT" issues sure sound like software issues vs. an actual issue with the transmission itself. I've put 3000 miles on the 2021 I purchased in Oct, and haven't had a single glitch (just ******* jinxed myself, huh?). Can't figure out how a multi-billion dollar company can't identify the cause and the fix.......

 

I’m having issues with my C7 and contemplating moving on. The problems that seem so rampant with the C8 are why it’s not even a consideration for a replacement if I make a change. Hopefully they get yours fixed and your confidence in the brand can be restored. I’m wishing the same for myself but idk if I can shake it off.

 

 

I just bought my 3rd C8. I had a 2021 put 10,000 miles on it zero problems. Next a 2024 put 3,300 miles on it zero problems. Just got my 2025 have to wait until spring to see how it is.

 

Just curious, why do you keep buying C8’s? Did you upgrade each time? Glad you didn’t have any issues but idk if miles that low can really be an endorsement for reliability. At least you didn’t have issues out the gate like the OP. I bet Uncle Sam loves you, lol, that’s a lot of sales tax.

 

Seems like a few different things are causing the issues but mostly debris in the solenoids. Sometimes they clear themselves and sometimes the electronic flush clears it. 100% it's a big deal when it happens to you no matter how many people say it's random or seldom. Like many I also have it in the back of my head no only on trips but every time I drive my car.

 

Maybe the In and Out visit fixed it? I like In and Out too...........

 

I think the Vette got spooked when I was telling my Partner I’ll trade it in for an economy Toyota and never look at another Corvette again : P

 

Update 2: Car is in service and they are inspecting it. CEL did not return and shifts were normal when driving. They are thinking it might be software related. Will keep you all updated when they know more.