[Immoralus]

When do you all think it would be a good idea to contact Chevrolet Customer service to escalate things?

[RedJewel2LT]

I contacted Chevrolet the day after the car went into the shop. When you call all depends on what your objective for contacting them is. If you do plan to call them, make sure you pack a whole lot of patience. Hopefully your experience will be painless. Mine has been and continues to be filled with frustration and aggravation.

I called them because of a number of reasons. Primarily I felt they needed to compensate me for my time without the vehicle, inconvenience, and stress.

My request to them was an extension of my bumper to bumper warranty to 48 months/48,000 miles and a parts/accessories voucher. Good luck to you and hopefully all goes well for you!

[Immoralus]

Thanks RedJewel! Hopefully I will be able to contact them at my lunch tomorrow! Good luck to you also.

[Desertdualsport]

Update on my car - I have over 500 miles on it since the flush and still no rpm flutter or hunting for gears etc. The only think I am still skeptical of is the 1-2 shift. Has been that way since new, but if light throttle, it seems sloppy....maybe normal though. I think I really need to ride with someone in a non-affected 16/17 auto to be sure mine is definitely right.

Anyways, it is all good for now and I will update as this progresses! Again, mine did not get a torque converter yet and the triple flush/filter/flash corrected the extreme rpm fluctuation at cruise speeds, as well as shuddering at low speeds.

Nick

[Turtle 2ss]

Taking my car to the dealer on Monday. I took it in 3 weeks ago for a oil change and told them to just check the trans. Dealer came back with "The Tech said something is wrong" I waited 2 day for GM to tell the dealer what to do. They did a re-flash and said " You are good to go" Then the other night i felt the shacks. Every time i felt that i always thought is was the road. So it must of been that way before and didn't pay it no mind. Now that i know there is something wrong it's going back to the dealer. Now that i talked to the dealer i am getting the feeling he is going to say " That is how it is" Does anyone have the Service Bulletin? I tried to find it and came up with nothing. Also my car was built in Aug 2016

[Immoralus]

Just called my Service associate and the shop Forman took the vehicle home and said nothing was wrong with it. I'm sick of this BS already. Calling Chevy in the next few minutes.

[Desertdualsport]

Originally Posted by Turtle 2ss

Taking my car to the dealer on Monday. I took it in 3 weeks ago for a oil change and told them to just check the trans. Dealer came back with "The Tech said something is wrong" I waited 2 day for GM to tell the dealer what to do. They did a re-flash and said " You are good to go" Then the other night i felt the shacks. Every time i felt that i always thought is was the road. So it must of been that way before and didn't pay it no mind. Now that i know there is something wrong it's going back to the dealer. Now that i talked to the dealer i am getting the feeling he is going to say " That is how it is" Does anyone have the Service Bulletin? I tried to find it and came up with nothing. Also my car was built in Aug 2016

There are a couple of reference bulletins, HOWEVER, the 2016/2017 Camaro wasn't listed on them yet. mostly vettes and trucks/escalades. So, your dealer needs to put in a tech help/ticket, whatever it is called, to GM. They will recommend the flash and triple flush, then converter replacement if needed. The first step is to hook it up to the mobile test set and go for a ride to check TC slip. If they don't do this, they are wrong and are just guessing.
They need that data to send to GM.

[Desertdualsport]

Originally Posted by Immoralus

Just called my Service associate and the shop Forman took the vehicle home and said nothing was wrong with it. I'm sick of this BS already. Calling Chevy in the next few minutes.

My advice = make sure you log the problems IN DETAIL and then type up a "Tech Notes" paper describing what the issues are and what to do. I give one to the service manager, and tape one to the nav screen when dropping off, to be sure the tech actually gets it.

[Turtle 2ss]

Originally Posted by Desertdualsport

There are a couple of reference bulletins, HOWEVER, the 2016/2017 Camaro wasn't listed on them yet. mostly vettes and trucks/escalades. So, your dealer needs to put in a tech help/ticket, whatever it is called, to GM. They will recommend the flash and triple flush, then converter replacement if needed. The first step is to hook it up to the mobile test set and go for a ride to check TC slip. If they don't do this, they are wrong and are just guessing.
They need that data to send to GM.

I think they might have done that already because when they had my car a few weeks ago. They told me that they were waiting for a response from GM on want to do. They said change the TC or the whole Trans. That's when GM said just to reprogram. And that's what they did. I will let you know what they tell me after i drop it off on Monday.

[camaro5]

After reading some of these latest posts - this is my hypothesis:

The 8L90 uses electronic controlled capacity clutch (ECCC) technology, which employs a small,

regulated amount of slip to dampen out engine pulses for a smoother running drivetrain, especially during shifting.

Read more: http://gmauthority.com/blog/gm/gm-tr...#ixzz4ZrG8LeAl

Slip? Anyone who's "slipped a clutch" knows too much slip wears the clutch disc.

The TCM algorithms are "slipping" the TC lock-up clutch too much, wearing

the friction material, contaminating the fluid, and clogging the filter.

If you are a proactive owner, you take the vehicle for service before too long.

This scenario allows them to flush out the debris, change the filter, and see if there's enough TC lock-up clutch left to work.

The flush must remove clutch plate debris from all circuits and solenoids, etc.

New TCM algorithms uploaded


Some owners don't worry about it, or get told by service "not able to duplicate", etc.

In this further-worn scenario, the clutch in the TC is all but shot. Chances of debris clogging circuits and solenoids is high.

New TC at the least, and maybe new tranny too.

New TCM algorithms uploaded


Why?

Solenoids do all the shifting now. Super heavy duty versions of the good old pinball flipper solenoid. On - or off, period.

If there is nothing absorbing the driveline shock of instant solenoid gear changes, the driver would be miserable and the driveline would be short-lived.

"The 8L90 uses electronic controlled capacity clutch (ECCC) technology, which employs a small,

regulated amount of slip to dampen out engine pulses for a smoother running drivetrain, especially during shifting."

So right now they're doing a TCM reflash to add new algorithms to lower the amount of lock-up clutch slippage.

The A10 uses this same technology with a different TC.

Hope the new algorithms do the trick.

Hope GM has made this a production change.




UPDATE: Just found this from 2015:

Got a hold of GM and this was it, thanks to Silver Sled as well.: The recall number for the 8 speeds is 15389. It is for Torque Converter Clutch (TCC) shudder. That's all I know. There is no other info on the recall yet. I don't know if it's a reprogram or replacing something. I'll try and keep an eye out and see when it gets updated.

MORE DIGGING:
From Live Chat: "This bulletin 15389 provides a service procedure to reprogram the transmission control module (TCM) on certain 2015 model year Cadillac Escalade, Escalade ESV, Chevrolet Silverado, GMC Sierra, Yukon Denali and Yukon Denali XL vehicles equipped with an 8L90 8-Speed (M5U) transmission and 6.2L (L86) engine. These vehicles may have a condition in which transmission calibration allows a higher than target energy input to the torque converter clutch (TCC) under certain conditions. This may lead to faster than expected torque converter clutch material wear, and a shudder feeling when the TCC is applied."

Edited by CptMcSaug, 26 May 2015 - 10:11 AM.

http://www.gm-trucks.com/forums/topi...-update-15389/

Working on it since 2015? Rut ro



Don't EVEN look at this Corvette forum search on 2017 shudder

http://www.corvetteforum.com/forums/...y=2017+shudder

Gonna need carbon fiber clutch plates to fix this - don't hold your breath for that.

Fatal design flaw - wow...No fix after 3 years, no effective fix coming.

[Chutzpah]

[QUOTE=camaro5;9581878]After reading some of these latest posts - this is my hypothesis:



Slip? Anyone who's "slipped a clutch" knows too much slip wears the clutch disc.

The TCM algorithms are "slipping" the TC lock-up clutch too much, wearing

the friction material, contaminating the fluid, and clogging the filter.

If you are a proactive owner, you take the vehicle for service before too long.

This scenario allows them to flush out the debris, change the filter, and see if there's enough TC lock-up clutch left to work.

The flush must remove clutch plate debris from all circuits and solenoids, etc.

New TCM algorithms uploaded


Some owners don't worry about it, or get told by service "not able to duplicate", etc.

In this further-worn scenario, the clutch in the TC is all but shot. Chances of debris clogging circuits and solenoids is high.

New TC at the least, and maybe new tranny too.

New TCM algorithms uploaded


Why?

Solenoids do all the shifting now. Super heavy duty versions of the good old pinball flipper solenoid. On - or off, period.

If there is nothing absorbing the driveline shock of instant solenoid gear changes, the driver would be miserable and the driveline would be short-lived.

"The 8L90 uses electronic controlled capacity clutch (ECCC) technology, which employs a small,

regulated amount of slip to dampen out engine pulses for a smoother running drivetrain, especially during shifting."

So right now they're doing a TCM reflash to add new algorithms to lower the amount of lock-up clutch slippage.

The A10 uses this same technology with a different TC.

Hope the new algorithms do the trick.

Hope GM has made this a production change.



I agree with your hypothesis, but in agreeing.... why are some A8's affected, while others are not? If the wear on the clutch plates is enough to foul the filter and a flush resolves the issue with a new flash, owners still have a allot of miles taken off that clutch. I would want either an extended warranty or a brand new torque converter.

A proactive owner could check his transmission fluid for signs of fouling and bring it to his or her dealers attention early on, if there was a transmission fluid dipstick. The owners manual states there's no need for a dipstick as only a leak will lower the level (Gee thanks, really?) How about the condition of the fluid, do people not look at that anymore?

[Dallace]

I am having the same issue. Just not as bad. My problems are.

1. When I floor it starting at 55 and above the tc seems to slip.
2. There isn't a difference in the way the transmission acts in the different drive modes.
That's about it. I love my car thou. Car was built 8/2016.

[Desertdualsport]

Update on mine (original threat start - 1000 miles since flush and flash and solid still

[Turtle 2ss]

Originally Posted by Desertdualsport

Update on mine (original threat start - 1000 miles since flush and flash and solid still

Glad to hear that. Picking up mine on Saturday after the flush. The Tech don't think it will be fixed. So they told me to put about 200 miles on it. If it comes back then they will change the converter. But glad yours is going good.