Cadillac 2007 dts, gear shifter shifts but dashboard says it's stuck in low gear so vehicle won't start

SOURCE: 2007 HHR gear shifter button engaged and stuck in park

I had the same problem and once I wiggled the shifter enough to get it out of park then the key stuck in the ignition started.

SOURCE: 91 VOLVO 240 WILL NOT SHIFT INTO 4TH GEAR. WHEN I

Your overdrive relay is bad,but its just as easy to bypass this relay,and never have this problem again IPB sales an bypass plate.

SOURCE: 2007 chevy impala won't shift into gear, shifter

try checking the tranny fluid, too little and the car wont move even if you shift into gear

SOURCE: Can't shift into reverse ( manual transmission )

I have the same problem on my 2005 cts. The shifter fork has two rubber bushings that attach at the transmission that break or give way. I assume they did this for a softer feel and to avoid vibration but it leads to the selector not engaging well when you go the extreme direction of reverse on the shifter as there is too much deflection. I replaced the bushings with washers as spacers and it seems to work as a "McGyver" fix. I do intend to get the parts needed from Cadillac to restore it to factory standards. Hopefully they have the parts. To fix the problem you have to go under the car. To get good access you have to disconnect the exhaust and the driveshaft. I did it without this and just tormented my poor hands but I wasn't willing to do all the other work while in my driveway. You simply take the clip holding the fork shaft onto the transmission selector end off and slide the small shaft out. I also took off the shifter side of the fork to study the thing a bit better. That takes a 13mm and a small allen wrench, 4.5 or 3/16, can't remember. Then replace the bushings or do as I did and stack some washers so as to get rid of the slack between the inside of the fork and the gear selector on the transmission. Assemble and try. If you have as good dexterity and tenacity at your fingertips as I do, you'll curse the day you attempted doing this without taking out all the other stuff. If you don't, take out all the other stuff to make room for your hands. The space is very confined. Good luck.

SOURCE: The manual transmission gear shift

take out the console, look on youtube for videos of others doing this. most likely you are going to need a saturn shifter bushing repair kit which you can get on ebay for less than 20 bucks.