Transmission Problem

[qtband]

Where do I start?
I was noticing a little "surging" in the transmission for a few days. Tonight, after driving, It wouldn't shift into reverse or drive. A few seconds later, it did go into drive and I made it home, but when I stopped in the driveway to open the door, it wouldn't move. Forward, or reverse.
I was hoping it was just a shift solenoid, but I fear something worse.
Any suggestions
No engine light.
150,000 miles
Rear drive.

After a few hours, I started the car and was able to move it into that garage.  It rumbles in reverse.

Any ideas?

[cdgrinci]

It may be as simple as low fluid, though that could be from a problematic leak.  Any sign of leakage?

[qtband]

There is no leakage at all.   Any other ideas?

[Logan]

Hard to tell without year and trans model. 'CTS' is kind of vague.

Here is a link to some TSBs.....one looks interesting about a cracked fluid pickup that causes no forward and no reverse. But just guessing not knowing the year..

Having a scan tool that can see the operating data inside the transmission would be helpful. 

https://www.transmissionrepaircostguide.com/cadillac-cts-transmission-problems/

 

 

 

 

 

[qtband]

It is a 2004 SRX.   Rear drive.  

[Logan]

I think that is the 5L40-E trans. But double check that. Coming up on 20 years old...really could be anything. 

Here is a link to some common issues with that trans. 

https://axleaddict.com/auto-repair/The-GM-5L40-E-Automatic-Transmission-Common-Problems