Cadillac Repair: code p086, vehicle speed sensor, pressure gage

Question
What would be the root cause of the code p086? I have a 94 concours and it wont shift past 40 mph. the car was hit on the passenger side and then i started to get all kinds of codes poping up. i saw your other responce on how to check the codes and clear them so i did that and took it for a drive. still wouldnt shift and came back with the same 86 code when i returned. I understand the computer systems are under the dash on the passenger side but are they all there and are they seperate. also would this be a transmision computer issue or the "main" PCM issue? I have changed a pcm in a neon before but that was simple. easy to get to and there was only one computer. where should i start looking to get this fixed?

Answer
P086 means that you have an undefined gear ratio which can be caused byfaulty or damaged:

Vehicle speed sensor.

Trans temp sensor.

Trans input speed sensor.

Pressure regulator stuck.

damaged trans filter or filter pickup tube leaking.



The only way to test it is with a transmission pressure gage.

This is a very UNCOMMON code and is very unusual.