Question about Cars & Trucks
A diagnostic trouble code (DTC) of P0440 is telling you that your vehicles computer (PCM) has detected a leak somewhere in your vehicles EVAP system. A little information on the function of the EVAP system; when your vehicle pumps fuel to the engine basically it builds up pressure that is sent back to the fuel tank and then that pressure is sent back towards the engine and is stored in a canister usually under the vehicle by the fuel tank. That pressure is sucked out of the canister by the vacuum of the engine...into the intake system of the engine and out the exhaust. That's a basic way of putting how the system works. What P0440 is saying is that somewhere in that EVAP system is a leak. About half the time it is a faulty gas cap. Due to the age of the vehicle that's the most likely cause. If the seal to the gas cap looks good and it seems to tighten up good when put on, you will want to check all the lines and seals at some of the solenoids and hose connections in that system. Also check the canister itself for cracks. If able to hit on the canister or even remove it and shake it. There is charcoal that seems to be real loose like there is a bunch of little rocks in the canister, you may have a blockage in the system and the back pressure is blown out which in turn makes a leak. If I remeber correctly the evap canister is behind the fuel tank but still on that left side more. It's kind of hard to miss. Hope this helps you.....
Posted on Oct 17, 2013
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Posted on Jan 02, 2017
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