My car stopped moving forward or backwards. I can put it in gear, but it. Doesn't move. Could it be the timing belt. It's at 161,000 miles.

By your description it sounds like your parking brake is locked up, as in parking brake shoes seized inside the drum

It sould like your shifter cable/cables have broken or your transmission fluid could even be low.

http://acurazine.com/forums/problems-fixes-114/04-tl-automatic-transmission-failure-any-experts-864560/

I would start by verifying that the vehicle's charging system is working at the correct voltage followed by checking to see if any ground wires attached to the transmission or in fact connected to the frame and or battery and that they are in what appears to be a clean contact after that I would verify by visually inspecting any wires and plugs on the transmission including sensors that none of the wires appear to be split or detached from the harness or the plugs I would also verify any plugins to the computer of the vehicle this would be also the time to visually look at the linkage or shift cable to the transmission make sure that it's hooked up correctly and that it moves you would have the vehicle if this is an automatic transmission to be running for about 5 minutes on a flat surface and check the fluid level if it is dark and not red and hue it probably needs replaced and most likely will require a new automatic transmission filter to be installed as well aside from this there is the remote possibility that you have a transmission code pointing to the internals of the transmission like solenoid or pump failure the possibility of input or output shaft sensor not working or speed sensor there could be a possible malfunction with your transmission control unit or transmission control module and these could possibly be integrated into your vehicles power control module or power control unit at its most basic your transmission is a hydraulic pump relying on hydraulic pressure and in at least 90% of my experiences with the drivetrain involving the movement of a vehicle I would say that it's most likely going to be that your filter needs replaced if you can't recall the last time the transmission filter was replaced then this is most likely going to solve your issue. Regardless I would try the fluid and filter and see what happens as this will most likely take care of your problem and if it doesn't you can always drain that fluid back off of the transmission and take the filter back off of that transmission as a new or rebuilt transmission will require a fluid and filter I hope this has been beneficial and educational to anyone that is read this and if anyone has more to add or Reason to dispute the validity to my explanation or statement I would greatly appreciate that you were to email me at nicholascolegrove4@gmail.com so that I can better inform my clients in the future. Of course this statement only pertains to vehicles with an automatic transmission and not a standard shift which has generally less variables and would more likely point to a clutch or slave cylinder issue as well as the possibility of a linkage problem . There are instances with both to where it's am actual drive axle issue commonly referred to as a rear end . This being am Acura I'm going to automatically assume this is an automatic transmission.