When making a u-turn earlier today my check engine light came on and the transmission went in to limp mode. I checked the codes and got the following codes, all transmission related:
P0700 Transmission Control System Malfunction
P0743 Torque Converter Clutch Circuit Electrical
P0748 Pressure Control Solenoid Electrical
P0753 Shift Solenoid A Electrical

The codes come back immediately after clearning them. So far I have checked and cleaned the electrical connections at the transmission and PCM on the firewall with no luck. I did discover that it only throws the P0700 code if I leave the PCM unhooked and turn the key to the "run" position. I am suspection a bad PCM at this point. Any ideas?

THANKS!

Edit: sorry, should have put this in the "HELP" section

 

Sounds like could be the wiring inside the pan. That or a wiring problem or realy problem. They are all connected .

 

The relay is fine, I'll have to check the wiring in the pan though.

 

all 3 of these codes are sharing the same power from the relay you need to check the wiring from the pcm to the trans. if i remember right the bottom pcm plug bottom terminal goes to trans pin #1 at trans conn. is 12v feed should read batt voltage with key on. pin#2 is b5 volt sensor feed should be 5 volts with key on. pin #3 is ground these are at the trans. connector

 

Thanks. I'll check and see if it is getting voltage. If all checks out good, I plan to drop the pan and check the wiring inside the trans.

 

did the person who done the work on your tranny work on them before?
im not trying to be cocky just asking if someone put something back together wrong?

 

It is possible something is messed up. I did the work myself and I have done transmission work before.