Service Engine Soon - Code P-0446B

[qadknight]

I have a 2002 GX and this code keeps coming on. Any ideas other than tighten the gas cap before I go to Mr. Goodwrench?

[illinoiswronski]

P0446 is defined as: EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT MALFUNCTION. It might be the gas cap.

[qadknight]

Local repair shop cleaned out a solonoid on the fuel filler line. Drove for about a week (70 miles) and the light came back on. Repair shop will do further analysis and I will keep you posted.

[qadknight]

Problem was a faulty fuel tank pressure sensor. Fuel tank pressure was too high. Replaced sensor and no more problems.

[JTrujillo86]

How much did it cost you?

Jeremy

[Ruley73]

For future reference.... The P0440 code is the only code that is triggered by a loose, missing, or faulty gas cap. I have also found that a dirty air filter will trigger a P0442 code. Just a couple things I learned at work.