If you are proficient with doing your own repairs, this is one that you may be agle to handle at home, but it is not a speed sensor. You have a problem with a shift solenoid.
A quick tutorial.
The transmission is controlled by the computer. It reads inputs from the engine together with speed inputs from the transmission to compute which range in the transmission should be engaged. This is accomplished with solenoids that control line pressure, converter lockup, and shift valves. By activating solenoids, the transmission is shifted into the required range.
Your code indicates that shift solenoid C is apparently not performing its required function. This could be for several reasons.
1) The solenoid could be shorted or open.
2) The solenoid could be mechanically stuck.
3) The corresponding valve in the valve body could be sticking,
Access to the solenoids can be gained by removing the side pan from the transmission. For access, you must remove the left side powertrain mount and bracket. There is not a lot of room to work, but you can get to it.
You can check the solenoids for the proper resistance with an ohm meter. If resistance checks OK, you need to identify which solenoid is causing the problem. The solenoid is then easily replaced.
However, if the problem is internal to the valve body, then the valve body will need to be disassembled and repaired. This job does require some special tools, and is a bit beyond the scope of home repairs.
Monday, March 30th, 2009 AT 5:01 AM