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I dealt with that problem for years, then I licked it, mebbe ten years ago. The codes were P0456 and P0440. Never been back since. Nothing you haven't been told, probably but if you replaced the LDP, then the issue is you probably overlooked a cracked hose. Keep in mind I have a Dakota, so some of this prob won't apply to your truck. Some OLD responses of mine copied from other threads....
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I've dealt with small evap leak. Usually the under hood hoses and those underneath by the gas tank are cracked and leaking by now. Squeeze every inch of them and look for cracks, especially near the ends. If you find any, cut off and reattach Some hoses run under the battery tray too. I greatly reduced the frequency of the codes by eliminating the leaks, but they didn't completely disappear till I replaced the leakdetectionpump, which is underneath the truck, roughly below the driver's seat. The pumps are shared among many dodge vehicles.... I got mine from an 09' junkyard PT cruiser.
Originally Posted by Dodgevity Concentrate on these two things.... emission hoses and leakdetectionpump.
I had that code intermittently for years. It would come and go, but I was always able to find a window in which to get the emissions done.
I got tired of the light every few months though, so I started looking at all the hoses running from under the battery tray and found a cracked hose there and on a hose that ran to the PCV valve (if I recall correctly). I never would have known the hose was split if I didn't squeeze it, so squeeze and observe as you go along. It's usually the ends that crack. I cut the split ends off with a knife and reattached with zip ties. Also looked under the truck at the hoses running to charcoal canister and those seemed okay. Well the problem lessened in frequency, but didn't entirely go away. The final fix was to replace the NVLD pump (leakdetectionpump), which is located underneath the truck, roughly below the drivers seat in my quad cab.
The pump was one I got from a wrecked 2009 Chrysler PT cruiser. The pump is WIDELY used across many models and years of Chrysler vehicles, so I found the latest model vehicle that had one in the junkyard and it worked. Cost me only a few bucks and not a peep out if it since. If you search on the pump in ebay, it will show you the models that it fits. There are many aftermarkets (cheap too) but I stick to OEM with these things.
yeah… already replaced. Codes are gone. Now I only have the gascap message
yeah… already replaced. Codes are gone. Now I only have the gascap message
So the system is your government making sure that 10 ounces of gasoline weekly, worldwide, that those 10 ounces don't EVAPorate into the atmosphere every week.
The system does a pressure decay test over time. If the pressure can escape, then so can some gasoline fumes.
I've not seen a "gas cap" fault code, though it may commonly be that a 'slow leak' is likely 'sealed' when you replace an old fuel cap with a bad vent valve or sealing gasket...
You still have a leak...
A small, slow leak.
It could be anywhere or a combined many tiny leaks everywhere.
