Rick's Free Auto Repair Advice


P0440 Evaporative Emission Control System Malfunction

If you have a P0440 Evaporative Emission Control System Malfunction trouble code, read this post for information on how to fix it.

This code refers to the Evaporative Emissions Control system. That consists of the vapor lines from the fuel tank to the charcoal canister, the purge and vent valves, and the gas cap. This is a fairly general code that just says there’s a malfunction in the system. Thanks a lot car makers. There are other, more specific codes that tell you exactly what kind of fault it detected. This one, P0400 is the least helpful of all. You’ll have to check the entire EVAP system to find out what’s going on.

If that doesn’t fix the problem you may have a leak in one of the EVAP hoses. Read this post to understand how the EVAP system works.

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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