No more convertor replacements

robbie52 · 11-08-2018, 11:45 AM

The infamous shudder has returned on my 20162SS and I took it in today to try and get the convertor replacement scheduled. Seems that Chevrolet has issued a new bulletin stopping convertor replacements. Since new convertors are not resolving issue, they hope to have a new fix by January. In the meantime, dealers have been instructed to flush the transmission again. WTF.

Nsxmatt · 11-08-2018, 11:57 AM

There is probably 20 current threads that have explained that.

JT58 · 11-08-2018, 12:13 PM

Absolutely terrible. Does anyone know if this terrible 8 speed auto is in any other car besides GM? For instance I see other makes like the new Jeep Wrangler JL that lists an 8 speed automatic. After my Camaro and the shuddering issues, whenever I see 8 speed automatic I want to run as fast as I can.

Nsxmatt · 11-08-2018, 12:51 PM

Quote:

Originally Posted by JT58

Absolutely terrible. Does anyone know if this terrible 8 speed auto is in any other car besides GM? For instance I see other makes like the new Jeep Wrangler JL that lists an 8 speed automatic. After my Camaro and the shuddering issues, whenever I see 8 speed automatic I want to run as fast as I can.

The 8 speed in the Jeep/BMW and others is a ZF unit and a very nice and strong transmission. Transmissions in all cars for many years have been hit or miss. The current GM 8 speed is not a bad transmission, it's the torque converter and TCM tuning I think Is the issue.

crosive · 11-08-2018, 01:50 PM

Quote:

Originally Posted by Nsxmatt

The 8 speed in the Jeep/BMW and others is a ZF unit and a very nice and strong transmission. Transmissions in all cars for many years have been hit or miss. The current GM 8 speed is not a bad transmission, it's the torque converter and TCM tuning I think Is the issue.

you are correct. the transmission itself is fine. the tc and tune are the problems.

BA RS · 11-08-2018, 02:09 PM

So I have the shutter and called a couple of local dealership and one that is supposed to be really good told me that they are aware of the issue and have 3 options . One being the flush , the other is change the converter and flush it again , then the last was some reprograming the ecm which would I guess adjust the slip tables . I will taking it in a couple of weeks since they are backed up right now

DiGiam · 11-08-2018, 02:15 PM

GM has a fix coming in the first quarter of 2019. There will be no converter replacements until then. They have been told to flush transmissions as needed until then

crosive · 11-08-2018, 02:17 PM

Quote:

Originally Posted by BA RS

So I have the shutter and called a couple of local dealership and one that is supposed to be really good told me that they are aware of the issue and have 3 options . One being the flush , the other is change the converter and flush it again , then the last was some reprograming the ecm which would I guess adjust the slip tables . I will taking it in a couple of weeks since they are backed up right now

Question about the tcm reprogramming. The reason I say is after anything done to our transmissions, they must put the tcm into relearn mode. I wouldn't call that a reprogramming, but they might

DiGiam · 11-08-2018, 02:26 PM

Quote:

Originally Posted by crosive

Question about the tcm reprogramming. The reason I say is after anything done to our transmissions, they must put the tcm into relearn mode. I wouldn't call that a reprogramming, but they might

My guess is that it will be a new converter design and a revised tcm program to address the amount of converter slip allowed. And yes, they will almost always do a relearn on the trans whenever a change is made. If you have a trans tune in the car, they will flash it to the new program if thats what part of the fix is. from there you may have to have it tuned again because your tcm tune will be off of the old revision and not the new one.

chozn4service · 11-08-2018, 02:38 PM

Yea mine started to shutter just under 4K miles, didn't do it all the time but it became more noticeable. I took it in on Nov. 1st and had the trans and lines flushed out, they had the car for 3 days. I was told to expect some hard shifting as the car was relearning shift points but it's been smooth as butter and I've been driving it hard to see what's what. I mean it's under warranty so I've been driving it hard. The car is put s away now for the winter but I've told my Service Advisor the new fix is for the 1st quarter of the new year and I want to be first to get it done, once the roads clear off and the salt is washed away.

mdhopt36 · 11-09-2018, 07:10 AM

Got 8500 on mine, and knock on wood, is flawless. Like YARBIE 1.

Keep my fingers crossed?

Need4Camaro · 11-09-2018, 08:35 AM

Ive been grateful that this is one problem I have not yet experienced and Im at 16,000 miles.

Just wondering, why does flushing the transmission fix this issue to begin with?

Nsxmatt · 11-09-2018, 08:48 AM

Quote:

Originally Posted by Need4Camaro

Ive been grateful that this is one problem I have not yet experienced and Im at 16,000 miles.

Just wondering, why does flushing the transmission fix this issue to begin with?

When a trans slips enough either by the clutch packs or torque converter, the slip causes friction material to be released in the fluid. Maybe they thought the fluid was breaking down causing slip so a flush with a new type of fluid may help. Which obviously it did not.

RollaMo · 11-09-2018, 08:51 AM

Quote:

Originally Posted by mdhopt36

Got 8500 on mine, and knock on wood, is flawless. Like YARBIE 1.

Keep my fingers crossed?

At 8500 miles, ours didn't have this issue either.

It first showed up at just over 11,000 miles.
Triple flush fixed it, at least until just over 17,000 miles when it came back.

Another triple flush (Same day as GM sent the notice about holding off on converter changes), and it is working fine again.

This should make it until Q1 2019 when GM says a new fix is coming.

11-08-2018, 11:45 AM	#1
robbie52 Drives: 2016 Camaro 2SS Convertible Join Date: Dec 2013 Location: Evans GA Posts: 106	No more convertor replacements The infamous shudder has returned on my 20162SS and I took it in today to try and get the convertor replacement scheduled. Seems that Chevrolet has issued a new bulletin stopping convertor replacements. Since new convertors are not resolving issue, they hope to have a new fix by January. In the meantime, dealers have been instructed to flush the transmission again. WTF. __________________

11-08-2018, 12:13 PM	#3
JT58 Drives: Former 2016 Camaro 1LT Join Date: Jan 2017 Location: Naples, FL Posts: 760	Absolutely terrible. Does anyone know if this terrible 8 speed auto is in any other car besides GM? For instance I see other makes like the new Jeep Wrangler JL that lists an 8 speed automatic. After my Camaro and the shuddering issues, whenever I see 8 speed automatic I want to run as fast as I can. __________________ 2006 C6 Corvette Manual, 2019 Silverado, 1997 Jeep Wrangler

11-08-2018, 02:09 PM	#6
BA RS Big B Drives: 2016 2SS Summit White Join Date: Aug 2009 Location: Mansfield , TX Posts: 324 View My Garage	So I have the shutter and called a couple of local dealership and one that is supposed to be really good told me that they are aware of the issue and have 3 options . One being the flush , the other is change the converter and flush it again , then the last was some reprograming the ecm which would I guess adjust the slip tables . I will taking it in a couple of weeks since they are backed up right now __________________ 2016 2SS,NPP exhauset, A8, Black and White interior, black rims, black center stripe.

11-08-2018, 02:15 PM	#7
DiGiam Drives: 2016 NFG SS A8 Join Date: Jul 2014 Location: Valdosta Posts: 405	GM has a fix coming in the first quarter of 2019. There will be no converter replacements until then. They have been told to flush transmissions as needed until then __________________ 2016 NFG 1SS A8. Pray ported intake manifold, Rotofab dry cai, kooks 2" catted longtubes, E85,

11-08-2018, 02:38 PM	#10
chozn4service Drives: 2016 SS w/2SS A8 Blue Velvet Join Date: Dec 2009 Location: 39.793153,-86.238223 Posts: 3,678 View My Garage	Yea mine started to shutter just under 4K miles, didn't do it all the time but it became more noticeable. I took it in on Nov. 1st and had the trans and lines flushed out, they had the car for 3 days. I was told to expect some hard shifting as the car was relearning shift points but it's been smooth as butter and I've been driving it hard to see what's what. I mean it's under warranty so I've been driving it hard. The car is put s away now for the winter but I've told my Service Advisor the new fix is for the 1st quarter of the new year and I want to be first to get it done, once the roads clear off and the salt is washed away. __________________ Never grow up, it's a trap!

11-08-2018, 11:57 AM	#2
Nsxmatt Account Suspended Drives: 2017 Camaro Join Date: Mar 2018 Location: Kentucky Posts: 622	There is probably 20 current threads that have explained that.

11-09-2018, 07:10 AM	#11
mdhopt36 Drives: '17- 1ag37 V6 traded, for 1SS 2018! Join Date: Mar 2018 Location: MA Posts: 469	Got 8500 on mine, and knock on wood, is flawless. Like YARBIE 1. Keep my fingers crossed?

11-09-2018, 08:35 AM	#12
Need4Camaro Drives: '17 Camaro 2SS & '99 Camaro Z28 Join Date: Feb 2014 Location: Austin, TX Posts: 1,836	Ive been grateful that this is one problem I have not yet experienced and Im at 16,000 miles. Just wondering, why does flushing the transmission fix this issue to begin with?

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