New Owner, New problem... - Jeep Commander Forums: Jeep Commander Forum
Problems / Dealer Service Having a problem with your vehicle? Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

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post #1 of 18 (permalink) Old 07-15-2019, 06:18 PM Thread Starter
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New Owner, New problem...

Its only been a few weeks since buying the Commander and have already addressed a parasitic draw issue caused by the sunroof.... Thread here. https://www.jeepcommander.com/forums...und-fixed.html

Unfortunately, over the past week a P0452 code keeps coming back after being cleared. "P0452: Emission Control System Pressure Sensor Low Input"

So.... is the sensor usually the culprit, or would the "low input" indicate there is an abnormally low pressure (leak) in the system?

In addition, looking for the EVAP pressure sensor online, Im unsure as to where exactly the sensor is or what it looks like. Am I correct in the assumption that it is part of the "FUEL VAPOR CANISTER LEAK DETECTION PUMP" or as RockOuto calls is a "Vapor Canister Purge Valve / Solenoid"? This fits to the charcoal filter canister and upon removal, it appears the wiring harness connecting to it actually only powers what looks to me like a pressure sensor within the unit. The "check valve" within the unit seems to be mechanical contraption. The image after the link shows the two shiny circle parts which I believe are the pressure sensors itself. Is this the Pressure sensor?

The part in question... https://www.rockauto.com/en/moreinfo...rntuSejSD%2B1d






Furthermore, is it wishfull thinking that the fuel cap may be whats causing a low pressure reading "if" the sensor is actually ok?

I dunno.... guess Ill throw one of the above units AND a fuel cap at it and see what happens.

The vehicle is also very hard to put gas in as it keeps tripping the pump nozzle thinking is full when its not.... I took off all the lines having to do with the fill tube assembly and the evap canister etc and blew compressed air through them and found NO obstruction.

Last edited by LooseCannon; 07-15-2019 at 08:01 PM.
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post #2 of 18 (permalink) Old 07-15-2019, 09:11 PM
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Don't know if this helps or not, but I found a slightly different result;

Jeep Grand Cherokee WJ - Diagnostic Trouble Codes

P0452: Evaporative Emission Control System Pressure Sensor Low Input; NVLD pressure switch stuck closed.

As far the part you in the pic you posted, I couldn't tell you.


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Last edited by Big Blue; 07-15-2019 at 09:14 PM.
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post #3 of 18 (permalink) Old 07-15-2019, 09:36 PM
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Found this as well; NVLD stands for Natural Vapor Leak Detection Pump.

https://www.engine-codes.com/p0452_jeep.html

P0452 Jeep Meaning:

The Evaporative Emission System (EVAP) control system pressure sensor detects pressure in the purge line. The sensor output voltage to the Engine Control Module (ECM) increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.

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Last edited by Big Blue; 07-15-2019 at 09:45 PM.
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post #4 of 18 (permalink) Old 07-15-2019, 09:57 PM Thread Starter
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Hmmm..... looks like in 2007 they went from a NVLD to a ESIM which is the item I pictured. Looks like Im on the right track.

https://www.searchautoparts.com/moto...ystems-can-pre

The 2006 NVLD looked like this.



You can see it attached to the charcoal canister/filter under the drivers side rear behind the tire.

Last edited by LooseCannon; 07-15-2019 at 10:01 PM.
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post #5 of 18 (permalink) Old 07-15-2019, 09:59 PM
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Quote:
Originally Posted by LooseCannon View Post
Hmmm..... looks like in 2007 they went from a NVLD to a ESIM which is the item I pictured. Looks like Im on the right track.

https://www.searchautoparts.com/moto...ystems-can-pre

The 2006 NVLD looked like this.
I did what I could, best of luck.


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post #6 of 18 (permalink) Old 07-15-2019, 10:27 PM Thread Starter
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That helped... I appreciate it. I ordered one, and we shall see what happens.
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post #7 of 18 (permalink) Old 07-15-2019, 10:35 PM
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I have EVAP problems as well. The shop smoke tested the EVAP system and found a leak at the leak detection pump - it's stuck open. I haven't ordered one yet but just thought I'd let you know mine has failed as well.
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post #8 of 18 (permalink) Old 07-15-2019, 11:42 PM Thread Starter
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Quote:
Originally Posted by Aerogt01 View Post
I have EVAP problems as well. The shop smoke tested the EVAP system and found a leak at the leak detection pump - it's stuck open. I haven't ordered one yet but just thought I'd let you know mine has failed as well.
What code did you have?
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post #9 of 18 (permalink) Old 07-16-2019, 01:23 PM
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P0440 is persistent.

P0456 and P0457 were up for a few months and recently didn't come back.

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post #10 of 18 (permalink) Old 07-16-2019, 03:12 PM Thread Starter
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Quote:
Originally Posted by Aerogt01 View Post
P0440 is persistent.

P0456 and P0457 were up for a few months and recently didn't come back.

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Sounds like you have a leak in the evap system somewhere based on those codes.... you replace the gas cap and clear the code? You can clear the code without an OBD scanner by disconnecting both battery terminals and touching them together for about 15 seconds.
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