I have a 2016 LT1 Corvette with the 8sp automatic, the car has 11k miles on it. Took it out for a ride a little while ago and got on a long straightaway, slowed down to about 30mph and gave it about 80 percent throttle acceleration, after I was slowing down, transmission hung up in 4th gear, when I would accelerate, it would not shift to a higher gear and even when I levelized speed and quit accelerating, stayed in 4th gear. Then when I slowed to a stop, it downshifted to 2nd and actually spun the tires a little when downshifting. Took it back up the road again a few miles and did pretty much the same thing, never happened again, was this just a fluke or is it a problem that need to be looked into. Wondering if anyone has ever had this happen before? Thanks

 

That's a new on for me; sounds like a trip back to the dealer....be sure to post your results.

Good Luck

 

Will do, guess I should have went with 7sp manual, just thought auto would be more driveable and they said had better performance, should have looked for A8 problems.

 

Just throwing this out there - not sure if it describes what you experienced or not.

Did you happen to see this message on the DIC:

PERFORMANCE SHIFT ACTIVE
This message appears when the vehicle is in Sport or Track mode and either Performance Algorithm Shift/Performance Algorithm Liftfoot transmission modes have been entered.

If so, here is an explanation:

Transmission Shift Mode − Paddle Shift Automatic
Adjusts to either a smoother or firmer shift.

Sport – Performance Algorithm Liftfoot (PAL) recognizes aggressive throttle maneuvers and holds lower gears for greater engine braking and enhanced vehicle control when not using paddles. (Available in Sport or Track mode.)

Track – Performance Algorithm Shift (PAS) recognizes aggressive cornering, heavy braking, and high acceleration to select and hold lower gears when not using paddles.

 

Very interesting, could be what happened. This is the first C7 I have owned, have always had old vintage Corvette's without today's technology. I had the car in sport mode, this could very well be what happened. After it happened, drove it again and it never happened again, but also, didn't push the car quite as hard. Thanks for the info, will do more research on it and watch it. Guess I am just paranoid after reading all the problems that people have discussed about the A8 transmission, other that that one time, have had not issues whatsoever. Thanks

 

I had the same problem, 2016 with 1100 miles. I took it to the dealer and I copied this from the work order. “Transmission DTC P16F3 stored. Refer to S. I. doc 15-NA-007. Required update transmission calibration & SPS programming. Performed fast learn procedure.”

Never had any problems since and now have 23,000 miles on the transmission, I did have the free triple flush done at about 20,000 miles and they did find water in the fluid.

 

Thanks for the info, very informative. My car is a COP car that has full 12mo bumper to bumper warranty, will have to check with local dealer but would assume the triple flush and fluid replacement would be covered in that because of the track record and them knowing there is a problem. Sounds like from what you said and have researched on the internet, it would be a good preventive thing to have the flush and Mobil 1 fluid put in it before something happens to it. Thanks

 

Vetteman Jack, You were right, got the car out today, put it in sport mode and got in it a little bit, showed Performance Shift Active in the dash lights, held the car in the lower gears longer to help with deceleration, then went back to normal with no problem. Very good diagnosis, I am new to the C7's, have had mostly C1 and C2 cars and am not used to the new technology built into the newer vehicles. Thank for the information, every time I think something is wrong, someone always has the answer for a rookie like me. This is a very good site to get information, has as a lot of knowledgeable people on it. Thanks

 

You got that right . The 8 spreed is a like tossing the dice. Bum Torque converter among other things. If your one of the lucky ones you might get away with it. But to gamble 60, 70 or 80k on getting a good one. Forget about it.

 

Yes sir, so far I have had no problems with the A8, seems to be shifting well both up and down, but after reading and doing research on them, would have went with the manual transmission. Think when the weather breaks, I'm going to go to the dealership while it is still under warranty and see if they will do the triple flush and fill with Mobil 1 transmission fluid, people say it seems to correct it if they are having a problem and think it would be a good preventive measure to maybe keep from having problems.

 

Sounds like you "blipped" the throttle and the A8 went into the "performance shift mode".The owner's manual explains much of this if it was in fact performance shifting. algorithm kicked in. If your A8 is surging or lunging at a stop light or vibration, shudder or growling noise, usually during low/ medium speed acceleration, you may want to search for TSBs for A8 "harsh shifting" first issued in 2016. The shudder problem is widely known and various fixes have been the subjects of several TSBs and even class action lawsuits. I recommend doing a thorough search of Corvette Forum in the C7 section. I like the 10 spd. in my ZL1, so much better than the A8 if you can't have a manual.

 

What a shame the 10 speed auto wouldn’t fit in the C7 Would of been Awesome if it did

 

With all due respect... Baloney.. they are bulletproof. Hundreds in the 9s bone stock even the 8s.. think about that for strength and durability? and still streetcars. How many stock clutch M7s are running like that? How long do they last once run hard?

Did it take Chevy 3.5yrs to figure out the auto trans fluid they chose was wrong? Yep.. but problem was solved in Jan 2019..

Any "bum torque converters" were the result of moisture in the fluid causing uneven wear on the tcc...

Just thought I'd bring reality into the conversation.

 

Get the Range device and plug and play, it keeps car in V8 move all the time and keeps from alternating from v4 to v8 mode where torque converter is most active. One on for sale site for 90 bucks. I have been using one for 2 yrs great product. Yes take car in and have fluid changed, TSB 18-na-355. TSB states on first page if customer complains no further testing is required, just change fluid. I had mine changed few months ago and it is much smoother and I didn't have an issue just for peace of mind.

 

Great info, what is the Range device and where are they available?

 

Good to hear that your problem is solved.

Way to go, Vetteman Jack!

 

Only $90?

That sounds very fishy to me - way underpriced.

 

Guy wanted a 100 and offered 90 and he said he would consider it so not sure. Last one I bought was 95.00, again I have bought 5 and they ranged from 95 to 130. It had been up for sale for a couple of weeks and I as first to reply so maybe he was just ready to let it go for 90 or 100.

 

Device that plugs into the OBD port just under dash left of steering column, size of match box, plug and play no set up. Keeps car in v8 mode all time. Look on the c7 for sale site always one for sale from time to time or get new from RANGE, google it. There is a guy selling one for 90-100 bucks if still there.

 

Thanks, will do.