Auto Transmission seems off...

[John`]

Hi, a weird thing happened with my car today.

As I was accelerating from a stop sign in DS mode, my car held the rev at ~6,000 RPM in 2nd gear without shifting. I was worried and quickly shifted my car back to D mode where it resumed normal driving

However, my car seems different now. Even at 80-85 MPH, it never goes past 3.1k RPM in DS mode, it used to go at least 3.4k+ RPM. Also my car only hovers at ~2,500 RPM when going 75 MPH...it used to be at least 2,700-2,800. I think RPM is lower by an overall of 200-300.

Does anyone know if there might be a problem with my engine?

[moveswiftly]

thats just not possible unless you were in a lower gear before.

[Alex_bm]

I had similiar situation, when I got stuck in second all the way pass 6000 rpm when I was making a turn. Transmission refused to upshift. This was in D though.
The next day it was stuck again, not sure which gear.
Never happenned since.

That GM transmission is probably not the best out there.

[moveswiftly]

Is DSC or DTC active when you're doing this! It could just be that the system is preventing tire slip. Try It next tome with DTC ON

[Raine]

Originally Posted by Alex_bm

I had similiar situation, when I got stuck in second all the way pass 6000 rpm when I was making a turn. Transmission refused to upshift. This was in D though.
The next day it was stuck again, not sure which gear.
Never happenned since.

That GM transmission is probably not the best out there.

Happened to me once too, DS mode and the transmission simply wouldn't shift even at 6.5k+ RPM.