Check engine light on

Evap ,,, bad gas cap,,,not venting,,,,,,,evap purge valve,,, under truck, has trash in it,,,,,,,,,evap solinoid,,, under hood stuck open,,,,all 3 pieces together are less than 100 bucks,,,,,,,, get the whole assenbly(purge valve) at pep boys,,, 31 bucks,, the othe 2 are 20 to30 each,,,get any where, also could be a a bad fuel presure sensor in the top of the gas tank,,, very rare not likly or the charcole canister ,,,never seen one bad,,,,if you have a odb2 scaner tool,scan down to the evap vp and evap purge,, at cold start the evap vp (h20)..,,,0.125...,and stay fairly steady, if it rises steady the solinoid under the hood is bad or stuck,,, .The evap purge should be 0.000 for about 90 seconds then open and be around 11-15% at idle,,,,

Most likely is a bad EVAP purge valve. But check below list.
This indicates that a part of the EVAP control system is no longer functioning 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 controlled 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.
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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:

• 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 solenoid
• Repair resistance in purge connector
• Replace PCM

When the check engine light is on and the code is for a problem with the EVAP system, and the valve tests bad.

most fuel systems are not vented if cap has vent that could be your prob or you have a prob with your evap system front or rear sencer could be bad or your evap canister could have mosture in it you need to have a systems check to find out what code has been thrown weather it's electrical or emmissions

Unfortunately the P0440 code could be a comdination of about 4 different possibilities within the EVAP System:

1. Fuel Cap loose or Not holding proper pressure causeing a leak in the EVAP System
2. EVAP Canister Purge Volume Control Valve
3. EVAP Canister Purge Control Valve
4. EVAP Canister Vent Control Valve

The Vent Control Valves are common for going bad and causing leaks in the EVAP System.

Now, the P0600 Code - ECM recieving incorrect voltage from A/T control Unit Continuously.

Unfortunately, my suggestion to you would be to take the vehicle to your local Nissan Dealer where they have the appropriate scan tools to monitor the EVAP System and the Transmission control System.

Hope this helps...

code p 0441 refers to evaporative emission (EVAP) system --incorrect flow detected ==== causes --- hose connection/s--- intake leak---EVAP canister purge valve replace the purge valve

SOUND LIKE EVAP PURGE VALVE CONTROL SOLENOID GONE BAD ITS LOCATION ON THE 4 CYLINDER ENGINES IS ON A BRACKET NEAR THE AC COMPRESSOR AND 6 CYLINDER ENGINE ITS LOCATION.NEAR REAR FIREWALL SIDE CYLINDER HEAD BELOW THE IGNITION COILS.CHECK THE EVAP PURGE VALVE CONTROL SOLENOID FUSE AND IT WIRES AND CONNECTOR BEFORE BUYING A NEW ONE.

maybe a fuse is blown? did you have the mechanic check the fuses? or even check all your relays and wiring?

Hi:
Your P0446 code is a Evap vent valve code: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:

• Faulty vent valve
• Open, short or excessive resistance on Vent valve control circuit
• Blockage of vent valve
• Bad PCM

Possible Solutions With a P0446 OBD-II trouble code, here are some things to try:

• Replace Vent valve
• Repair open, short, or resistance problem in control circuit
• Repair open, or short, or resistance problem in power circuit
• Replace PCM

P0440 - Evaporative Emission (EVAP) System


evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.


The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.


Here are some additional causes.

* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking