Grand Sport transmission slips 1st gear
Thread Starter
Heel & Toe
Joined: Jan 2026
Posts: 16
Likes: 5
From: Forked River NJ
Grand Sport transmission slips 1st gear
Hey Guys
I need your help, my 2019 GS with 6,000 miles (newly acquired) has a slipping trans in 1st gear when starting from cool/cold start. It is intermittent and not doing it all the time but just under a moderate acceleration. I've been told if the production date of the car was past February 2019 the new trans fluid was installed so it wasn't necessary to do the triple flush. I did purchase a GM warranty extension from the dealer, which is in force.
What do you guys have to say? Thoughts?
I need your help, my 2019 GS with 6,000 miles (newly acquired) has a slipping trans in 1st gear when starting from cool/cold start. It is intermittent and not doing it all the time but just under a moderate acceleration. I've been told if the production date of the car was past February 2019 the new trans fluid was installed so it wasn't necessary to do the triple flush. I did purchase a GM warranty extension from the dealer, which is in force.
What do you guys have to say? Thoughts?
