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P0440 Diagnostic Trouble Code Discussion for January 2014

General EVAP System Failure

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Trouble Ticket Help Requests for DTC P0440
Help Request Posted
2001 GMC Yukon XL 1500 SLT 5.3L MIL Lamp on VIN: 3GKEC16T91
P0440: evap fault. tank pressure voltage reads 1.25v when i use my modis to command purge solenoid to 10% or more there is no change to tank pressure voltage. 12v to purge solenoid and opens when control wire is grounded manually. im thinking ecm driver is not grounding control ...
January 24, 2014