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P0440 Diagnostic Trouble Code Discussion for May 2007

General EVAP System Failure

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Trouble Ticket Help Requests for DTC P0440
Help Request Posted
2003 Buick Rendezvous CX 3.4L MIL Lamp on VIN: 3G5DAO3E13
P0440: EVAP System No Flow During Purge. This vehicle came to my shop with mil on. Pulled codes po440 evap system problem. I have checked system for leaks. No leaks found. One thing i notice is that the gas cap can be taken off still no pressure loss. I dont know if this is because it has check valve...
May 08, 2007