Codepo731 car drives fine had transmission.

There is a service bulletin regarding a PO731. Are you getting a slipping from 1st gear or a rough shift?

SES) Service Engine Soon Light On with Diagnostic Trouble Code (DTC) P0731, No Movement in Drive During Cold Ambient Temperatures (Replace Oil Pump or 1st Gear Sprag Clutch Assembly) #03-07-30-008A - (May 12, 2004)

(SES) Service Engine Soon Light On with Diagnostic Trouble Code (DTC) P0731, No Movement in Drive During Cold Ambient Temperatures (Replace Oil Pump or 1st Gear Sprag Clutch Assembly)

1998-2002 Saturn S-Series Vehicles

with Automatic Transmissions (MP6/MP7)

Check to see when your vehicle was built, This could relate to your vehicle.

Just to add to this one did you just have a high low pressure test performed?If so what was the pressure at idle in park with the line pressure fuse in and with it out?Also a step pressure test should be done that will tell you if you have a worn pressure regulator bore in the valve body very common on that car. Also the pressures should be checked with the line pressure fuse in and the car in revesre and in drive. Also the pressure should be watched when placing the car in reverse if the pressure is slow to build to full line pressure you could have a loose input shaft nut very common on those cars. Do you have a delay bang or delay into reverse?Has anyone done a actuator audiable test when the code is active?

I would still do a step pressure test to test for worn pressure regulator bore you need a tech to do that with a pressure gauge.

, If he only checked the pressure with the line pressure fuse in and with it out and didnt do a step pressure test he didnt do a step pressure he didn't do a full line pressure test.A step pressure test you use a tech 2 scan tool and has the computer command the pressures to all different pressures starting with the lowest pressure to the highest pressure and you watch a see if each step is within range of what its commanded?Its a great way to check for a worn pressure regulator bore. It doesn't sound like you have a bad 1st gear clutch pisiton. It sounds like you have wire issue pressure control solenoid issue or a worn pressure regulator bore in the valve body.I know how to test the pressure on these transmissions I am factory trained Saturn tech I went to spring hill Tennessee where they build them for training.I have also worked for Saturn dealers for over 16yrs working on them so I know these cars well.

Sounds good.

His scan tool has to be able to be to do a step pressure test which only the tech 2 and the oringal scan tool that Saturn dealers used with the Saturn software which I have. Those are the only two that I know of. Also what happens is the wires going into thetrantransmission valve body the wires break inside the insulation causing intermittent transmission issues.

OK let m know what they say.

So he said the code P0731 is just setting for no reason?If so he is full of it and doesn't want to take the time to find the problem.I already made my suggestions about the code. So why was it setting the other code?Also how quick does the code P0731 come back after you clear the code?

If it takes a whole week to set the code then its possible a bad wire harness to the valve body. Wait till it happens more frequently and easier to find. But there is a reason the code is setting.