Help please with P0452 P0441 - DODGE DAKOTA FORUM - FORUM AND OWNERS CLUB!
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  #1  
Old 03-09-2019, 04:02 PM
03quadcab4dot7 03quadcab4dot7 is offline
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Vehicle: 2003 Dodge Dakota 4.7 V8 Auto
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Default Help please with P0452 P0441

My vehicle: 2003 Dodge Dakota 4-door with 4.7 V8 and 5-speed auto, 4wd.

I am getting CEL and P0452 and P0441, read with my hand held scanner. I am not sure that I am getting the correct description for the codes, but my scanner says:

P0452 EVAP emission control system pres sensor low, and
P0441 EVAP emission control system purge flow fault.

The codes are thrown when it is warm out, and usually below 1/2 tank gas. I have replaced several dry/cracked hoses, new gas cap, and new solenoid purge valve.

In some sources I read that P0452 can be a faulty vapor pressure sensor and that the sensor is usually located on top of the fuel tank. Problem is, I can't find a listing for a replacement sensor at RockAuto, at Advance Auto, or at the Dodge dealer, we went through his online parts book. I did not drop the tank yet, but I am not sure I will find one on top of the tank.

Does this truck have an EVAP pressure sensor? Is that function satisfied by the leak detection pump? What does P0452 mean specific to my vehicle? Other than taking it in for the dealer to work on, any more tests I can run on my own?

Thanks for you help.
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  #2  
Old 03-10-2019, 03:49 AM
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oldmarine oldmarine is offline
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There is no evap pressure sensor. The system is designed to detect leaks at the leak detection pump itself. The pump (powered by engine vacuum) runs until it achieves a specific pressure in the evap system (less than 1/2 psi), then will stop until the pressure drops. If it drops, the pump will start to run again. The PCM monitors this and determines if there is a leak, and how large it is, based on how long the pump stays stopped. Then it will trigger an appropriate code (large leak, small leak, etc.) In your case, it seems that the PCM determined that the leak detection pump may not be working, or working properly.

See these two threads for a discussion on the complete system, and how another member resolved his problem (the threads are related):

https://www.dakotaforumz.com/showthread.php?t=9231
https://www.dakotaforumz.com/showthread.php?t=9237
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Old 03-10-2019, 12:36 PM
03quadcab4dot7 03quadcab4dot7 is offline
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Vehicle: 2003 Dodge Dakota 4.7 V8 Auto
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Oldmarine, thank you for the reply. I went through the other threads, and I will be ordering the pump today. I'll follow up with how it turns out later this week.
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Old 04-05-2019, 12:43 AM
03quadcab4dot7 03quadcab4dot7 is offline
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Vehicle: 2003 Dodge Dakota 4.7 V8 Auto
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Rep:10
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I replaced the pump, and CEL gone. After I had the old pump out, I carefully took it apart, and the solenoid/needle was stuck. I freed it up and put a little lubricant on it, but will not be putting it back on the truck. There were no holes in the diaphragm, so I think it was sticky or stuck. Anyway, thank you very much for the help.
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Old 04-05-2019, 01:03 AM
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oldmarine oldmarine is offline
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Rep:80
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Thanks for the followup. This will let other members who experience the same issues know what worked for you. Good job on the fix!
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