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I just repaired a P0442 yesterday on my 03 Dakota 4.7l.
Found a brittle hose under the truck that has a pinhole causing the code. Trimmed the bad part off, stuck it back on and back in business.
Make sure you check all the evap hoses not only that they're attached and tight, but that they're also in good condition as to avoid something like the pinhole issue above.
As far as your last two codes I don't know exactly what you'd want to do there I've never had those before. But I would start by cleaning as many grounds as you can. I also have a Jeep and it had some funky issues with starting, idling, and the voltage gauge on the dash had a mind of its own.
Cleaning battery cables and grounds fixed all those issues.
There are grounds all over your truck and if they are not making good connection then the modules/computers aren't going to read data and work correctly. Therefore throwing codes. Again, I've never had this problem on any of my D's so I'm no expert. Just thinking out loud.
Also, I'm assuming your battery voltage is actually okay, your computer just thinks it isn't. And I'm assuming your transmission works okay, and the computer just thinks it isn't.
I also have a Jeep and it had some funky issues with starting, idling, and the voltage gauge on the dash had a mind of its own.
Cleaning battery cables and grounds fixed all those issues.
I know keeps so much more. I’ve had an XJ and YJ. Lots of keep people run a much bigger ground cable because a lot of issues come from that.
Do you have the 4.7 or 5.9? P0700 leads me to think 4.7 ?
P0440 - not listed in my book P0456 - EVAP Small Leak P0455 - EVAP Large Leak P0442 - EVAP Medium Leak P0562 - PCM supply voltage low P0700 - EATX/Aisin subcontroller fault
Check your hoses at the charcoal canister - there's a rubber 90 boot that likes to tear, in addition to rubber lines cracking both at the canister and under the battery tray. The hose from the fuel tank is hard plastic and can brittle-crack
Do you have a charging system/voltage light on the dash? What is your measured idle voltage in park and 2000 RPM voltage in park?
0700 is a generic - will need to read the TCM specific code.
Concentrate on these two things.... emission hoses and leak detection pump.
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 (leak detection pump), 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.
04-29-2020, 09:44 PM
