Reelfun1

I’ve already had one torque converter replaced on my 2015. The bumps are back 5000 miles later. Is the torque converter covered under the transmission warranty? Car is just over 3 yrs old.

Toombs

If yours is a 2015, you should have a 5-year 100,000 mile Powertrain Warranty. I'd think it'd be covered.

bjones7131

I agree should be covered

rogerm60

Sorry to hear this because my 2015 is in the shop as we speak for a TC replacement. If this is not the fix that stops the A8 problems, this car will have a "For Sale" sign on it before the next trip to the dealer.

lakemg

Did they perform the trans fluid flush first?

Inspectorcallahan

Mine’s a 2016; the converter was replaced...seems to have helped, but still has the fluctuations. I hope the TC replacement fixes your problems - it didn’t mine.

It’s back in the shop today; GM wanted the dealership to run a “Log”. They’ve given the data to GM; waiting for the response.

Mine is rock solid in Manual...no fluctuations. I can’t help but think it has something to do with the TCM - Torque Converter Pressure Control Solenoid, but surely GM would have figured this out, right?

Anyway, good luck to you. I can’t say it hasn’t crossed my mind to sell mine too - if it’s not corrected, but I just love the car too much to give up just yet.

Take care

05XLRtoC7_San Diego

By the Range AFM for $190. Supposedly THE SOLUTION to stop the A8 reliability issues.

Inspectorcallahan

You know, best advise I’ve been given in months! Thanks! I think I’m going to do jus that - so sick of taking this to the dealer and yet, I don’t want to drive around in manual either.

Thanks, 05XLRtoC7_San Diego!

05XLRtoC7_San Diego

It's worth a shot! Small amount of $ to potentially end a ton of frustration and repairs. Just make sure to unplug it whenever you go back to the dealership.
I have not read a single case of a torque converter failure when the C7 owner was using the Range AFM Disabling Device.

cowboy casey

I leave my range plugged in when I drop off at the dealer unless they are doing something requiring the ODB2 port... They won't have any idea

kenownr

Does the Range AFM work on the A8 Z06 also? I have a base 15 now (with no TC problems, at least now - 30K on the clock) LOL. A Z is in my future soon and I hate to buy a second one if I don't have too.

bjones7131

Yes sir it will work. I think it will work all GM vehicles.

CB1953

....installed in my 17 CTS-V...no more shudder, no hesitation, nice and smooth...money well spent.

ATC

Picked up my 2015 A8 yesterday from the flush and refill with synthetic. Range went on when I got home. Drove 120 miles today and I love not going to V4 mode ! What a difference

C5Driver

Its obvious GM could care less about there customers. These A8 transmissions should have been recalled a long time ago already.

NSC5

As long as the car is going into V4 mode it is going to abuse the torque converter lockup clutch because it is continuously cycling between lock and unlock while in V4 mode to absorb vibration. This is going to reduce the life of the converter and create ever increasing shudder as it ages. GM has been trying different cylinder shutoff schemes since the problematic Cadillac 8/6/4 system from decades ago and they have tried many different schemes and at some point they may get it right but that point hasn't been reached yet.

The LT1 and LT4 run great as a V8 but make a lousy V4 and to absorb all of the additional vibration they resorted to a steel torque tube (for the regular Stingray/Z51/GS) and the converter clutch shenanigans. Because the vibration level is higher with the M7 transmission (no converter to absorb the vibration) going into V4 is purely up to the owner; adding a Range module to the A8 gives the owner the same choice to avoid this mess.

The Z06 gets less aggressive AFM partly because the additional exhaust sound control valves would quickly get fried just as users experienced when tracking the Z51. Even without a Range module (or keeping the transmission in manual mode) the Z06 rarely experiences shudder because it seldom goes into V4.

My Z06 is always either in manual mode or has a Range module plugged in and the A8 (March 2016 build) has been flawless. The only extra thing I do is a quick shift to 2 and back to 1 while it is still stationary at the first start of the day to avoid the initial harsh 1 to 2 shift. If GM would just update the TCM software to do an initial partial fill of the C4 clutch pack actuator then the owner wouldn't have to do this at initial startup.

iclick

Whether a TC job will be a long-term fix may depend largely on when the work was done. At some point near the beginning of 2017 the third TC revision was offered, this after the first two plus the original part all experienced some repeat replacements. I haven't seen any failure reports of Rev. 3 (#24280631) reported yet, but that doesn't mean there haven't been any. The TC part # should show on the invoice.

767guy

^^^^^^^^^^^^^^^^^^

AORoads

I'd say there are really two problems: the first is, of course, finding a fix that will last for at least 2-3 years for/with the trans or TC. The second is years down the road, or, how long will the new fix last and will it be long enough for those who either go past the miles or time period of their Powertrain warranty?

In the past, GM has been pretty good about eventually finding a fix either in metal parts or fluids. The C6 had issues with the differential fluid; it took the initial fill plus two other "mixtures" to get it so that as late as the last model year, '13, there were no longer any issues. So, a fix or fairly permanent remedy IS possible.

iclick

It's the "is possible" part that worried me when I had my A8. If the TC fix didn't hold after the warranty expiration I'm in for an expensive tab, and an extended warranty would've been the rule had I kept the car. I shouldn't feel the need to spend $$$$ like that for a problem I didn't create, so I moved on. M7 was and is my salvation.