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This is a "known problem" and Honda has issued a Technical Service Bulletin that states the most likely fail item is going to be the EVAP Bypass Solenoid Valve. Unfortunately, it also states that water intrusion is the cause and after replacement of the Valve, the PCM will more than likely need to be replaced as well. The EVAP bypass solenoid valve can fail due to corrosion. The solenoid valve may get water inside. If the water contains road salt, the solenoid windings could corrode, causing the valve to fail. In a few rare instances, the corrosion could be severe enough to cause an internal short in the solenoid valve, which could damage the ECM/PCM. If this happens, both the bypass solenoid valve and the ECM/PCM would need to be replaced.

Edited by Jeff Collision
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