Vent control Valve

DTC P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit.
Circuit Description
An ignition voltage is supplied to the evaporative emission (EVAP) canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve by means of an internal switch called a driver. The scan tool displays the commanded state of the EVAP canister vent solenoid valve as ON or OFF. The control module monitors the status of the driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.

Do you know how to test automotive electrical circuits using a volt meter ? How to test a transistor (driver) inside the PCM . Videos on youtube. Do you know what a wiring diagram is ?
Also search P0449 on youtube . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click engine ,then under subsystem click fuel controls . Click search the blue link. Scroll down to #9 diagram . Circuit for vent solenoid . This video is a chevy truck ,doesn't matter .
GMC Chevy Truck DTC P0449 EVAP Vent Solenoid Control Circuit

Here is the description for the code. The vent system would need to be checked out to find the actual problem. It should have been fixed under factory warranty.
The P0446 codes triggered when an improper voltage signal is sent to Engine Control Module (ECM) through EVAP canister vent control valve.
Possible causes - -
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Vent control valve harness is open or shorted
- Vent control valve circuit poor electrical connection
- Faulty vent control valve
Read more: http://engine-codes.com/p0446_isuzu.html#ixzz2WVj6BK29

P1448 NISSAN - EVAP Canister Vent Control Valve Open

Possible causes- EVAP control system pressure sensor and the circuit
- Blocked rubber tube to EVAP canister vent control valve
- EVAP canister vent control valve
- Water separator
- EVAP canister is saturated with waterWhen is the code detected?EVAP canister vent control valve remains open under specified driving conditions.

Is this stock which would actually be a a 305 Camaro with a 4 barrel feed back Quadrajet?
Basically,
Vapor line from the tank to a Tank Pressure Control Valve (small round inline valve) then to the "Tank" port on the Evap canister (they are usually marked)

The other canister port marked "Purge" goes into a Vapor Contol Valve. That Valve has three more ports. One to the carb bowl vent, manifold vacuum and to a Thermal Vacuum Switch.
The last port of the Thermal Vacuum Switch connects to port vacuum from the carburator.

There are several potential (possible) causes for this code (Checking output signals from fuel tank pressure sensor under evap.system test, if fuel tank's vacuum is higher than prescribed threshold, PCM sets P0441.

1. The fuel tank pressure sensor sends a signal (voltage signal) to the PCM (Powertrain Controm Module) when it performs a diagnostic test of the Evaporative Emissions System (EVAP).

Frequent Causes:

If this sensor (DPS - Differential Pressure Sensor (fuel tank pressure sensor) is telling a lie (wrong/erratice voltage signals) to the PCM, it could cause this code, P0441, to set.

Also, if the purge control solenoid valve (PCSV) is not operating properly (i.e., stuck open), it can also set P0441.

Finally, if the EVAP charcoal canister filter is clogged causing a restriction in the purge air flow, it can also set P0441 (rare, most often, if the filter is restricted, the PCM will set a different code (i.e. P2422 - Emission System Vent valve stuck closed).

The most probable cause is the PCSV (Purge Control Solenoid Valve).-- seen it very often. This does not mean you should start throwing money after parts until you get lucky and find it the expensive way.

Your problem may still be under warranty repair coverage - check with your nearest Hyundai Dealership & ask the appropriate questions. They'll tell you if your issue is still covered under warranty.

Hope this helps.

findme('p0441'); findme('P0441'); findme('P0441');

the p0496 means that the evap system flow during non-purge first check ur gas cap this can cause the check engine code if cap is good and on tight than the usual culprit is either evap purge solenoid and or canister vent solenoid sticking not expensive to replace by self in driveway but before u do check with a dealer in area and advise about code to see if covered should be since its an 08 evap should be covered [dont know mileage and or condition of truck which makes a difference on warranty ]

P0496 is not a gas cap, problem is with the purge vent solenoid (on intake manif) or purge vent valve (under car by fuel tank). Most likely the vent valve. Depending on your vehicle/VIN you may be eligible for the 10 year/120k mile warranty Caddy just came out with but is keeping a tight lip on. See bulletin #09205 dated 3-11-2010. Good luck with this!!

it's probably your valve cover gasket leaking. I would take it back to dealership and have them repair under warranty. If they want to charge you for something new, DON'T let them fix anything, look on the internet for a shop close to you with GOOD reviews and have them double check the cause.

The heater core is on the passenger side under the dash within the heater airflow contoller box. If you had Xray vision and could look straight through the glovebox, then you would see it. The heater control vale for the water flow is on the passenger side top of the engine near the firewall. It will have a domed top with a vacuum line to it and it is placed into the heater core supply hose.

In your charcoal box in the engine bay by the fire wall. You may be able to free it up the frozen valve by tapping it and hitting it with some wd-40.