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P0440 Diagnostic Trouble Code Discussion for October 2010

General EVAP System Failure

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Trouble Ticket Help Requests for DTC P0440
Help Request Posted
1999 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K4X
P0440: EVAP System No Flow During Purge. P0440 & p0449 keep setting after a couple minutes at idle. Already replaced fuel cap because the seal had visible cracks and was original. Also performed a smoke test found no leak in the system. Replaced what I thought was the fuel tank vent solenoid in t...
October 04, 2010
2000 Pontiac Bonneville SSEi 3.8L MIL Lamp on VIN: 1G2HZ5412Y
P0440: EVAP System Malfunction. vehicle has a p0440 code and "check gas cap" comes on in info center. customer replaced gas cap but problem still occurs. have smoke tested system and have found no leaks. clear codes and code comes back. anyone come across this on this vehicle?
October 19, 2010