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CCTMSTR, GM Certified Master Technician
Category: Car
Satisfied Customers: 395
Experience:  GM Master Technician.ASE Master. Advanced Level L1.NV.State G2 Emission Inspector
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My 2002 gmc truck is displaying fault code P0440. what is it ?

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my 2002 gmc truck is displaying fault code P0440. what is it ?
Submitted: 8 years ago.
Category: Car
Expert:  CCTMSTR replied 8 years ago.
P0440 is a trouble code indicating a large EVAP system leak.Possibilites are,a loose or missing gas cap,a vent solenoid not closing during an EVAP self test ,any EVAP line,canister or even a fuel tank
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