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Re: Autoenginuity and EVAP Testing
Posted to Tool & Equipment Forum on 7/22/2006

Hello Danny

Strange the P0440 is a major EVAP system malfunction not nessarly a leak code. The vent solonid being unplugged should have set a vent control circuit malfunction. The vent circuit control code I don't belive is defined in that 99 truck so GM use... Login to read more.