Faulty ccv vent control solenoid . check engine light stays on. how do i fix this problem.

the most common causes are vent solenoid and fuel cap
P0440 PONTIAC code possible causes

• Missing or loose fuel cap
• Incorrect fuel filler cap used
• Fuel filler cap remains open or fails to close
• Foreign matter caught in fuel filler cap
• EVAP canister or fuel tank leaks
• EVAP system hose leaking
• Fuel tank leaking
• Faulty vent solenoid
• Faulty EVAP purge switch

https://www.justanswer.com/pontiac/9xoy3-2000-pontiac-montana-3-4l-check-engine-light-p0440.html

https://www.yourmechanic.com/article/p0449-obd-ii-trouble-code-evaporative-emission-control-system-vent-valve-solenoid-circuit-malfunction-by-spencer-clayton

need to have it check for trouble codes...most auto parts will do it for free

You have an Evap System problem and yes, this can cause poor gas mileage. Possible causes are:

• Plugged vapor canister
• Faulty vent solenoid
• Pinched or blocked EVAP hose
• Faulty FTP sensor

Depending on what the actual trouble code is, you would start by testing the component and the circuit back to the computer.
And yes you would need to erase the code once the problem is fixed.

you should check the wires and the plug on thje ccv vent control solenoid, if they look good replace the solenoid, get the catalytic converter checked at a shop, a clogged cat can cause some of the other codes.

Here is the definition of the code.
Possible causes are a defective gas cap or a leak in the vent system.

P0441 DODGE Description The vapor pressure sensor, Voltage Solenoide Valve (VSV) for EVAP, Voltage Solenoide Valve (VSV) for canister closed valve (CCV) and Valve Solenoide Valve (VSV) for pressure switching valve are used to detect abnormalities in the evaporative emission control system. The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal. Diagnostic Trouble Code (DTC) P0441 is recorded by the ECM when there is a malfunction in either the VSV for EVAP, the VSV for pressure switching valve, or in the vapor pressure sensor itself, or when evaporative emissions leak from the components within the dotted line in Fig. 1 below.

The ECM closes the CCV and opens the VSV for pressure switching valve causing vacuum to increase in the entire EVAP system. The ECM continues to operate the VSV for EVAP until the vacuum is increased to a specified point at which time the ECM closes the VSV for EVAP. If the vacuum did not increase, or if the vacuum increased beyond the specified limit, the ECM judges the VSV for EVAP and related components to be faulty.
Read more: http://engine-codes.com/p0441_dodge.html#ixzz242qD9pXO

The most common causes for error code P0442 (EVAP small leak detected) are listed below:

? Fuel filler cap damage or missing

? Faulty or damaged fuel filler pipe

? Leaking, disconnected or plugged fuel vapor lines.

? Fuel in lines due to faulty Rollover Valve

? On-Board Refueling Vapor Recovery Valve (ORVR valve) or stuck closed CCV.

? Improperly installed or stuck Purge Control Solenoid Valve (PCSV).

? Faulty Fuel Tank Pressure Sensor (FTPS).

? Leaking canister

First time remove the engine cover



Then you will see the engine


A - Airflow ducting
B - Integrated EGR/ASV valve
C - Crankcase vent tube (CCV)
D - Timing Belt cover
E - VNT actuator - part of turbocharger
F - Engine Oil Fill cap
G -Turbocharger control unit
H - Alternator
I - N75 / turbocharger boost pressure control valve
J - Mass Air Meter
K - Fuel Filter
L - Power steering fluid reservoir
M - Screen Washer Fluid
N - Coolant Expansion Tank
O - ABS stuff
P - Ducting to Intercooler
Q - part of CCV piping connector
R - N75 / Turbo Pressure Control solenoid
S - vacuum reservoir ball
T - FLex couplling for Exhaust system
U - Hot side of Turbo: flex pipe
V - Air throttle actuator
W - Pipe for EGR


Yellow arrow shows the turbocharger

The VW serial number is located on the front of the turbocharger

The code you cite, P0447 - Evap. Emission Ctrl. System - Vent Circuit Open
This vent circuit is call the CCV (Canister Close Valve). This valve normally stays 'OPEN' to allow outside air flow through the charcoal canister, which absorbs fuel vapors when you put gas in the tank, then the engine vacuum pulls air through it to recollect the fuel vapors and burn them in the cylinder combustion process.

There is a two-pin connector connector plugged into/connected to the CCV. Perhaps it somehow disconnected itself or some foreign object damage the wire harness breaking the connection (circuit 'open' condition), which would set this code. Another possibility is the CCV coil (Solenoid) has an open coil/contacts in it. Regardless, before you start throwing money after parts, have it properly diagnosed first. The problem may simply be a loose/oxidized connection/contact between the CCV and the ECU.

Hope this helps.