DCT Flush
Race Director
Joined: Sep 2016
Posts: 13,180
Likes: 10,522
When I had my two year DCT filter replaced I was told the computer controlled flush was not now required per GM. They even pulled up the instructions on their computer and could see line 1 stating flush so they knew about it. I checked with two other dealer service reps and they also said no computer flush. New filter and replace fluid. I know on other threads this has been brought up and someone said if tranny needed repair/replacement it would be under warranty. That is fine if it goes out at home but I travel in it and don't want to be stuck. Does anyone know how to contact GM to verify this change in procedure? Any contact information would be appreciated. Also those that have had the filter changed, did you have the computer controlled flush and actually know/see them do it. Or was it just a filter change.
Everyone who's dealer refuses to do it should give them a zero on GM's survey.
Race Director
Joined: Sep 2016
Posts: 13,180
Likes: 10,522
You lose 6 to 8 oz of fluid, per GM, and the service procedure specifically says to top up the DCT afterwards. So yes, it is required. You're right that they shouldn't have charged for a full quart unless they give the remainder of the bottle to the owner.
Le Mans Master
Joined: Aug 2015
Posts: 8,243
Likes: 4,617
From: Southwest Florida
Do you have a copy of this service procedure page you can post here so I can show it to my Service Rep just in case they say it’s not required?
Le Mans Master
Joined: Aug 2015
Posts: 8,243
Likes: 4,617
From: Southwest Florida
“Note: It is not necessary to drain the transmission fluid. Only the fluid in the housing will be lost when removing the in-line filter cover. Approximately 8 ounces of automatic (fluid). © 2023 General Motors.”
Race Director
Joined: Mar 2007
Posts: 11,373
Likes: 8,530
The service procedure (in post#2) doesn’t say anything about they must top up (add back) any lost transmission fluid it simply notes 8 oz of fluid will be lost. ??
“Note: It is not necessary to drain the transmission fluid. Only the fluid in the housing will be lost when removing the in-line filter cover. Approximately 8 ounces of automatic (fluid). © 2023 General Motors.”
“Note: It is not necessary to drain the transmission fluid. Only the fluid in the housing will be lost when removing the in-line filter cover. Approximately 8 ounces of automatic (fluid). © 2023 General Motors.”
This first clip, I added in Edit, is from a later version of the first page. Its for a model year 2022, but these are updated for each model, so its probably a 2023 update. I don't have the rest of this version. The remainder of what I posted if from previous versions posted here or in my 2020 paper copy
Last edited by Andybump; Sep 30, 2023 at 01:50 PM.
