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P0440 Diagnostic Trouble Code Discussion for August 2011

General EVAP System Failure


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Trouble Ticket Help Requests for DTC P0440
Help Request Posted
1999 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y3X
P0440: EVAP System Malfunction. Vehicle has energized purge and vent solenoid at all times. Power supply checks fine. ECM supplying ground to both solenoids when key is on. Grounds go away when ECU connector containing wires to solenoids is disconnected. Sent to GM had new ECM installed and ...
August 30, 2011
1999 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y3X
P0440: EVAP System Malfunction. Vehicle has energized purge and vent solenoid at all times. Power supply checks fine. ECM supplying ground to both solenoids when key is on. Grounds go away when ECU connector containing wires to solenoids is disconnected. Sent to GM had new ECM installed and ...
August 30, 2011