To help you understand this better, you can read our detailed, technical discussion here about how the ECM/PCM checks for leaks by performing system self tests. Most other vehicles use another trouble code for this condition. One of the vehicles that lists the P0440 is a 2007 Jeep Wrangler. Some will set a P0455 or some other code. The caveat is that most vehicles set a different code for a large leak, and don’t even list a P0440 code. What Does the P0440 Code Mean?ĭiagnostic trouble code (DTC) P0440 stands for “Evaporative Emission Control System Malfunction – Large Leak.” Your car’s computer (the ECM/PCM) will set the code when it determines that there’s a significant leak in the EVAP system-however, keep in mind that this doesn’t necessarily mean that there’s a leak. If your car’s computer determines a significant leak in the EVAP system, it will trigger code P0440.
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