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Old 08-25-2011, 08:56 PM   #1 (permalink)
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Default P0440 Trouble Code

I just had this code thrown at me earlier today. It's the first time it's happened since I've had the car (bought the car Friday of 8/17). I've done some research and looking around and know about 3 things to try. I just wanted to maybe get some more up to date answers since the other post I found were a little old.

I filled up on gas about 3 days ago. I figured it would throw the code a lot sooner if my gas cap wasn't tight, or am I wrong?

I haven't yet to try resetting my ECU. I'm worried it might mess something else up? Someone calm my nerves about that so I can go try it please.

After I try these, should I delete the code with my DSP and wait a couple day to see if it comes back on? If it comes back on should I take it to a mechanic at that point?

Also, am I save to drive the car (it's my DD) with this code thrown?

Thanks for any and all help.
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Old 08-26-2011, 07:02 AM   #2 (permalink)
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Check your fuel cap and unhook the negative on the battery for a few minutes. If it comes back then you have some investigation to do.
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Old 08-26-2011, 07:05 AM   #3 (permalink)
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Any other codes with P0440 ?

P0440-GENERAL EVAP SYSTEM FAILURE
When Monitored: Engine Running. Fuel Level greater than 12%. Ambient Temperature
between 4C and 32C (39F and 89F)
Set Condition: The PCM does not see the NVLD switch close during the medium/large
leak test. The PCM will then increase the vacuum supply to the EVAP system by
increasing flow through the EVAP Purge valve. If the switch does not close with an
increase in vacuum, an error is detected. Two Trip Fault.
Check for the following conditions:
- Hoses disconnected or left off
- Holes or cracks
- Loose seal points
- Evidence of damaged components
- Incorrect routing of hoses and tubes
- Fuel Cap left off or bad gasket seal


You will be fine with Disconnecting the Neg terminal to reset the Code, it will not Damage anything
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Old 08-26-2011, 09:32 AM   #4 (permalink)
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Well I went out last night and checked my gas cap. It didn't seem loose or anything, but I went ahead and took it off and re-tightened it and then cleared the code with my DSP. Was this an okay thing to do or should I of disconnected the battery?

I plan on waiting a couple days and if the light doesn't come back on then I'd say I'm good?

If anyone has anymore advice, please let me know. I'm new to these cars and would love to know all I can about them. Thanks.
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Old 08-26-2011, 11:06 AM   #5 (permalink)
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Clearing with the Predator is fine. If the code stays away you should be all set.
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