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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?

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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/

 

 

 

 

 

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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

 

 

 

 

 

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