rmorin1249

Magic sauce 1, Magic sauce 2, Magic sauce 3.

Gearhead Jim

You are correct. However, the revised service procedure could indeed be a permanent fix, like a new design TC or revised programing.
No holding my breath...

Thunder22

Link?

surfinshorte

The way it works with a different brand (I am an assistant service manager/senior service advisor) is definitely complicated. Few things while the car is under warranty. Was the complaint confirmed or not?, part ordered or no fix available at this time?, multiple visits for same complaint?. All these technically go through the same route but some are harder than others. All require an email to the DPSM (District parts and service manager basically the REP for the brand for that dealer) for authorization for repairs. DPSM's have a certain area that they cover. Mine has 17 dealers I believe.

They always approve one claim where the part was ordered but the current repair order shows the vehicle is out of factory warranty. The others it is really up to the DPSM. If DPSM declines the claim then customer can call corporate customer service and state their case. Luckily our DPSM is nice. I have gotten things years and 10's of thousands of miles out of warranty covered or with very minimal customer participation. Even easier if it is a known problem and if there is a TSB or something like that.

Our manufacturer asks many questions. The main ones are is the customer original owner?, how far out warranty is the car out (mileage and/or time)?, is the vehicle regularly serviced at the dealer? (they consider this loyalty) putting money into the company not an independent shop, did the customer purchase the extended warranty that they were offered when they bought the car? All these questions weigh on how much the participation will be if any.

As far as required.... Never had an instance where we had to fix something by law because technically the car is out of warranty but haven't really haven't had a reoccurring issue like this with the brand I currently work for. Of course GM could be different. But if we have an repair order and we try to process it under warranty electronically and it is not covered, without a DPSM authorization code the claim will be denied and the dealer would have to eat the cost.

(btw would love to get a C7 A8 if they could fix this... UGH)

spinkick

If it makes the A8 shudder, should I be worried about using AFM in my M7?

lakemg

Since the M7 does not have a torque converter, it will be fine using the AFM.

AmmoVet

VaydorVette1

Yea, first time I've heard that.

This issue has become a swirling miasma of enigmas wrapped in mystery.
It's crazy that GM has let it fester this long.

69L79

As the miles pile up on these A8s there will be more failures. Those A8 owners not on this Forum will just accept that its working "normally" until complete failure. If you keep your A8s buy an extended warranty. My local dealer service manager told me that out of nine A8s they have sold six have come back with "problems". Four of those were complete failures.

Avanti

Permanent A8 fix = M7

z06inVB

don7790

​​​​​​Have not seen that anywhere. Where did you get that info?

aj98

Gearhead Jim

I saw a recent post where someone had been using the Range but removed it to take the car to his dealer for some other work. On the way to the dealer, the TC shudder symptoms started. IIRC there was also a post by someone who was experiencing the shudder with the Range still installed, but I can't confirm that.

Har-ray

23/C8Z

you M7 fans... you're never going to sway anyone looking at an auto car. Why in every thread do you have to chime in with it?

is it a "maybe if I can get 1 more M7 buyer they'll keep a manual vette around next time?" Because if that's the objective? It's a futile effort. The only other reason would be to try and make someone feel bad about their purchase. And that would be juvenile. So is it delusions of Grandeur? Or lack of maturity? Dont bother responding these were rhetorical questions.

don7790

I can understand the shudder returning when you take the Ranger out but while it is still plugged in it should not shudder. The Ranger does not fix the problem it just eliminates the symptom. The cause of the original problem is the AFM system, IMHO, from everything I have read. The injured party is the torque converter. If anybody still has a shudder with the Ranger plugged in please speak up.

NSC5

Note that there are more causes of shudder than just the torque converter so I wouldn't be surprised if someone reported a shudder issue with the Range module active BECAUSE there is an engine issue causing the shudder. GM's own TSB calls for diagnosing shudder by operating with the TCC set to unlocked and locked and in either case shudder should disappear if it is due to the TCC; the Range gets around this problem by avoiding AFM mode where the converter clutch is neither locked nor unlocked but is operating in modulated mode.

Also interesting for those who believe the new fluid is the fix: the latest TSB includes 2019 model year vehicles where the new fluid was used from the start AND it is interesting that under Corvette the LT5 engine (which doesn't have AFM capability) is missing from the current shudder TSB. Until they either disable AFM or leave the converter locked during AFM and let the owner deal with the vibration.

aj98

1SG_Ret

If they put the same A8 in the C8, I'd not even consider buying it. GM would be smart to source the ZF 8 speed and use it rather than waste time and money trying to develop their own in-house.