[CHASLT1]

My A8 never had any probs on my 2015 C7. Just that hard shift out of park when it is very hot. Not done it in months but now with 90's coming back we will see if it does it again.

[arpad_m]

Originally Posted by Spaceme1117

For most people, a fluid flush and filter change fixed the issue.

Also, on 2017's there is a software update for the TCM. It will help with the 1-2 hard shift on a cold start and drive. It will also correct a software error that can cause a random CEL. This is typically a free update at a dealership.

^^^ that software update is important, my 2018 already had newer software and never exhibited this hard 1-2 shift problem, even before it was tuned.

As TP2SS says, whether a flush and a filter is enough depends on how long the trans was used after the shudder began, if the TCC clutch is worn too far, unfortunately OP's wife will need a new torque converter as well (loved the quick language lesson, too ). Let's hope the flush will be sufficient.

[speedyink1]

Originally Posted by arpad_m

As far as I know, the I4 (LTG) never got the 10-speed transmission. It was "phased into" the rest of the lineup by 2021 (I think), see this post I made earlier on the topic.

Thanks!!

[GroundhogSS]

Originally Posted by Spaceme1117

For most people, a fluid flush and filter change fixed the issue.

Also, on 2017's there is a software update for the TCM. It will help with the 1-2 hard shift on a cold start and drive. It will also correct a software error that can cause a random CEL. This is typically a free update at a dealership.

Wow, I don't think they ever did the software update on my 2017. I had to get the triple flush twice. I still have the hard 1-2 shift.

[truckrglenn]

Do the trans fluid & filter change yourself. I did mine last year and I'm 67 yrs old with a bad back and arthritis in my hands.

[JoeCamaro444]

Best of luck with this! Hopefully you are catching it early enough.

[L2SS455]

Originally Posted by legendary70

Hello all.

Based on what people here have stated and watching some vids I am pretty sure my wifes 2017 has the a8 shudder/studder. Not sure which word is the correct one because it feels like a studder. it sometimes feels likes its shaking or studdering. whether its short or long distance it does it.

Is there a recall on that? How does that get fixed?

Best.

FWIW:
Class Action Against GM For Defective Transmission
General Motors (GM) has settled a class action lawsuit for selling vehicles with defective 8-speed automatic transmissions. It is reported that GM sold over 800,000 vehicles with these faulty transmissions without disclosing the issue to customers prior to purchase. Consequently, the class action settled in 26 states as the automaker sold defective transmission vehicles and allowed them to operate on public roads, endangering drivers, passengers, and pedestrians.
Lawsuit Charges
The lawsuit particularly relates to vehicles equipped with GM’s 8L90 or 8L45 transmissions, manufactured between 2015 and March 1, 2019. The lawsuit asserts that General Motors made a deliberate business decision to withhold information from customers about the transmissions’ subpar performance, despite being aware of the issue. This conduct is believed to be a violation of state consumer protection laws. The lawsuit seeks reimbursement for any expenses associated with repairs incurred due to the defective transmission and to hold General Motors accountable for not informing customers transparently and promptly.

https://thelemonfirm.com/2023/03/24/...tection%20laws.