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I doubt anything is wrong with your powertrain controller. It sounds like it's doing what it's supposed to, monitoring the EVAP system and throwing codes when it sees a problem. The problem went away or the check engine light would not have gone off. Some trouble codes can be self resolved like that (so many drive cycles without a problem, the light goes ...

The cars' computer runs tests on the emission systems on the car. When the car fails the test it turns on the light, if it passes the test after that it turns off the light. You may have something that is close to failing the parameters set by the OEM. A small leak that's just on the edge of passing. Something like temperature changes, or vibration could ...

It is most likely a leaking EVAP hose or a leak in the fuel line. Make sure it's nothing obvious like a hose hanging off or a gas cap missing. Also check for a check engine light and have the OBD code read if there is one. There is also a small chance that your fuel pump relay or fuel pump is the cause.

There are a lot of things that can set this code, so it can be time consuming to figure out, and there are some special tools that make the job a lot easier. You can do it without the special tools, it's just going to take longer. The list below is what it takes to set the code. When VSV for pressure switching valve is ON, ECM judges that there is no ...