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sunvalley brian
sunvalley brian, Dodge Mechanic
Category: Dodge
Satisfied Customers: 545
Experience:  7 years experience, ASE master certified, electrical, chassis, and powertrain master
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2003 Dodge Caravan, 3.3 FFV. CEL w/ code P0455. Took it to ...

Resolved Question:

2003 Dodge Caravan, 3.3 FFV. CEL w/ code P0455. Took it to dealer. They ran forced NVLD test and found NVLD failure and replaced(NNN) NNN-NNNND Pump-Leak Detection. Two days later CEL back on with same code. When I took it in I also explained that when I first start the engine in the am it was evident there was a vacuum being applied to the fuel tank because you could watch the plastic tank collapse, then after about 1/2 mile there would be a pop and it would be back to normal and CEL would stay on all the time. When I cleared the code it would take 2-3 days for it to come back on and then the vac scenerio would start. Any ideas? Do you think the leak detection pump was really bad?
Submitted: 9 years ago.
Category: Dodge
Expert:  sunvalley brian replied 9 years ago.
Dont think the pump was bad you either have a plugged charcoal canister, filter or gas cap.
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Customer: replied 9 years ago.
I had already replaced the gas cap with a new OEM cap. How could a plugged cannister or filter cause the P0455? That possibility does not show up in the trouble tree for that code?
Expert:  sunvalley brian replied 9 years ago.
Your tank is getting sucked in and the canister or filter is plugged not letting the vaccume out.