OBD code P0746. Where is the Pressure Control

P0746 Pressure Control Solenoid Performance or Stuck Off
A transmission solenoid is an electro-hydraulic valve that controls fluid flow into and throughout an automatic transmission. Solenoids can be normally open or normally closed. They operate via a voltage or current supplied via the transmission computer or controller. Transmission solenoids are usually installed in a Transmission Valve body, Transmission Control Unit, Transmission Control Module or inside the Transmission and it helps regulate the pressure from the trans fluid pump.


P0446 Evaporative Emmission Control System Vent Control Circuit Malfunction

What does that mean?
Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.

Symptoms
There will be no obvious symptoms to driver, other than MIL illumination.

Causes
A code P0446 could mean one or more of the following has happened:
* Faulty vent valve
* Open, short or excessive resistance on Vent valve control circuit
* Blockage of vent valve
* Bad PCM

Possible Solutions
With a P0446 OBD-II trouble code, here are some things to try:
* Replace Vent valve
* Repair open, short, or resistance problem in control circuit
* Repair open, or short, or resistance problem in power circuit
* Replace PCM


Hope this help (remember rated this post).

ITS ON THE INSIDE TRANSMISSION ON THE VALVE BODY.YOU NEED A TRANSMISSION MANUAL FOR THAT TRANSMISSION.IT HAS MORE THAN ONE SOLENOID.IT WOULD BE THE EVAP CANISTER REAR THE CROSSMEMBER NEAR THE FUEL TANK.ALSO CHECK THE VACUUM SWITCHING VALVE.VACUUM HOSES MAKE SURE NONE LOOSEN OR MISSING ALSO.IT COULD BE FAULTY. ITS LOCATION NEAR THE EXHAUST MANIFOLD AND ON THE AIR INTAKE HOSE. IT WOULD BE BEST FOR DEALERSHIP FIX BECAUSE THEY HAVE DIAGNOSTIC EQUIPMENT TO SCAN THE EMISSION SYSTEM LIKE THE FUEL TANK VAPOR PRESSURE SENSOR.IT WOULD BE CHEAPER TO HAVE SCANNED AT DEALERSHIP YOU WILL SPEND TOO MUCH GUESSING YOU HAVE MORE COMPONENTS IN THE EVAP SYSTEM THE SCANNER WILL FIND PROBLEM QUICKER.