P0441 code Natural Vacuum Leak Detection (NVLD) the cause?

p04099 ( p zero ,not P 'oh"
you wrote all that down wrong, no five digits allows.
learn to see them and write them down properly
my Spidy senses tell me it is this

Trouble Code: P0499 (3.7L V6 VIN K Auto)
NVLD Canister Vent Solenoid Circuit High
Trouble Code Conditions:
Key on or engine running. The PCM detected an open or unexpected high voltage condition on the Natural Vacuum Leak Detection (NVLD) circuit.

Possible Causes:

NVLD canister vent solenoid control circuit is open or is shorted to power

NVLD canister vent solenoid ground circuit is open

NVLD canister vent solenoid is damaged or it has failed

Make sure your Dakota actually has a leak detection pump (LDP). Midway through the 2004 production year, they changed to a Natural Vacuum Leak Detection (NVLD) system. If your PCM (engine computer) has three large connectors, you have the LDP. If it has four large connectors, you have the NVLD.
In 2003, the LDP was located behind and below the battery, under the electrical box with all the fuses and relays. With the NVLD system, the NVLD pump is located on top of the fuel tank, attached to the evaporative emissions canister, accessible by removing the left rear wheel and plastic inner fender liner.

Trouble Code: P0128

Thermostat Rationality Test

Possible Causes:


Check the operation of the thermostat (it may be stuck open).ECT Sensor is contaminated, damaged or it has failed.Inspect for low coolant level or for an incorrect coolant mixture.Trouble Code: P0440

EVAP Purge System Fault

Possible Causes:


EVAP purge valve vacuum supply is leaking or clogged.EVAP purge valve is stuck closed.EVAP purge solenoid has failed.NVLD assembly (leak detection) is damaged or has failed.NVLD switch circuit is open or the NVLD switch has failed.Ground circuit is open.PCM has failed.Trouble Code: P0456

EVAP Small Leak (0.020") Detected

Possible Causes:


.EVAP fuel tank or canister vapor hoses leaking or damaged.EVAP system component leaking, fuel cap loose or missing.Leak detection pump damaged or leaking.Trouble Code: P0622

Generator Field Control Circuit Malfunction

Possible Causes:


Generator field control circuit is open or is shorted to ground.Generator field control circuit is shorted to system power (B+).Generator field ground circuit is open.Generator is damaged or PCM has failed.PCM has failed.Here are the codes and causes.

The NVLD (natural vacuum leak detection) this uses a natural device that follow gas principles,the device is a open vacuum switch,a normally closed solenoid,it is actuated by a solenoid and a diaphragm,The NVLD is located on the atmospheric vents side of the canister on top of the canister outlet

Look at the following link. It definatly does make sence but possibly not the problem. Personaly I would probably start there after looking at the gas cap & hoses to the charhol canister. http://www.permoveo.ltd.uk/tabid/122/OBD-Error-Code/P0441/Diagnostics/Dodge/Default.aspx

Vehicles equipped with NGC engine control modules use an NVLD pump and system. Vehicles equipped with JTEC engine control modules use a leak detection pump. Refer to Leak Detection Pump (LDP) for additional information.
The Natural Vacuum Leak Detection (NVLD) system is the next generation evaporative leak detection system that will first be used on vehicles equipped with the Next Generation Controller (NGC). This new system replaces the leak detection pump as the method of evaporative system leak detection. This is to detect a leak equivalent to a 0.020 (0.5 mm) hole. This system has the capability to detect holes of this size very dependably.


Removal & Installation

1. Raise and support vehicle.
2. Remove left-rear tire.
3. Remove plastic shield (4) in front of left-rear tire. Access to both the EVAP canister (1) and NVLD pump (6) is from the area in front of the removed tire.
4. Disconnect electrical connector at NVLD pump.
5. Remove vapor line at NVLD pump. Pry outward on tab (3) and rotate pump (6) clockwise about 70 for removal.
6. Remove NVLD pump O-ring (5) from EVAP canister (1).
   

To Install:

1. Install new NVLD pump O-ring (5) to EVAP canister (1).
2. Position NVLD pump (6) into EVAP canister (1).
3. Rotate pump (6) until tab aligns with notch in EVAP canister (1).
4. Carefully install vapor/vacuum lines to NVLD pump.
   WARNING The vapor/vacuum lines and hoses must be firmly connected. Check the vapor/vacuum lines at the NVLD pump, filter and EVAP canister purge solenoid for damage or leaks. If a leak is present, a Diagnostic Trouble Code (DTC) may be set.
   
5. Connect electrical connector to pump.
6. Install plastic shield in front of left-rear tire.
7. Install left-rear tire.
   
   
   Fig.
   
   
   
   Fig.
   

Have a nice day (remember rated this help).

THE NVLD ASSEMBLY IS LOCATED UNDER THE VEHICLE ON THE METAL PLATE BOLTED TO THE FRONT ALUMINUM K FRAME..JUST BEHIND TRANS DIFFERENTIAL..HAS SOME HOSES AND AND AN ELECTRICAL CONNECTOR GOING TO IT..BLACK PLASTIC HOUSING..HOSES LEAD TO CANISTER BEHIND FRAME..DISCONNECT HOSES,ELECTRICAL..MARK THEM IF YOU NEED TO..BUT ALSO LOOK FOR A BROKEN WIRE NEAR NVLD AT CONNECTOR..UNBOLT ASSEMBLY FROM FRAME..I YOU HAD A NEW ONE YOU WILL SEE WHAT IT LOOKS LIKE..I HOPE THIS HELPS

P0441 Evaporative Emission Control System Incorrect Purge Flow OBD-II Trouble Code Technical Description Evaporative Emission Control System Incorrect Purge Flow
What does that mean? This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system
. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.
Symptoms Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light.
Causes A code P0441 could mean one or more of the following has happened:

• Bad vacuum switch
• Broken or damaged EVAP line or canister
• Open in PCM purge command circuit
• Open or short in Voltage feed circuit to Purge Solenoid
• Faulty purge solenoid
• Restriction in EVAP solenoid, line or canister
• Corrosion or resistance in purge connector
• Bad PCM

Possible Solutions With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

• Common Chrysler fix - Replace Leak Detection Pump / LDP
• Repair damaged EVAP lines or canister
• Repair open or short in voltage feed circuit to Purge Solenoid
• Repair open in PCM purge command circuit
• Replace purge Solenoid
• Replace vacuum switch
• Repair restriction in Evap line or canister or soleniod
• Repair resistance in purge connector
• Replace PCM

Replace the NVLD (natural vacuum leak detection) pump. Remove the right rear tire and inner fender splash shield. The pump will be attached to the vapor canister.

P0440 and P0441 are refering to the NVLD pump. It is in the rear on the right side up near the fuel tank. P0344 is your cam position sensor on the rear (drivers side) of the cylinder head. The P0440 and 441 are probably why the check engine light is on and the 344 was stored from a previous event. Either way they are two different and unrelated problems. The NVLD (natural vacuum leak detection) pump is an emission item with no effect of the way it runs however it will keep the engine light on. The cam sensor will keep it from starting or intermittently run bad and not necessarily turn the light on. Both parts are easy to change. I hope this helps.