This is kind of an usual code to get it says E.C.S vent valve solenoid malfunction but it says a VENT the only real vent is the gas cap I would check that first not that isn't venting out its not venting in to the system .
I can't say for sure I haven't seen it but it could be the problem .
SOURCE: code p0449.
GM uses an EVAP solenoid that is located under most vehicles near the gas tank and connects to the charcoal filter can. Codes can be set and will drive you crazy trying to figure out if you have a bad gas cap, broke lines---this is where they try to get you to do a smoke test, or you just think the vehicle is no good! Relax, it is usually an easy fix and one GM has known about for years but continues to make easy money off people who cannot do basic maintenance. Now one code that comes up is usually P0449, along with maybe a warning to check the gas cap to see if it is on tight! GM will gladly read this code out for you for around $98.00 and then fix it for another around $100.00 which includes the EVAP part which if you buy at their parts dept. will cost you $32.00 and my dealership parts man told me they sell one a day! It is easy money for them and obviously a defective part they keep using for the last 10 or 15 years but hey, its money in their pocket. Here is how to fix it with ONE single common screwdriver! Get under the vehicle after putting on the parking brake. The EVAP solenoid is easy to spot near the gas tank and it has one electric connector which disconnects by releasing the plastic clip and pulling the connector out. It also has ONE air line connected which goes to the charcoal cannister which also can be removed with the one screwdriver. The whole EVAP solenoid and air can can be removed with the screwdriver which makes it easier to unplug the electric and air line. Get a replacement from the dealer as they certainly are familiar with this part as they sell LOTS of them. Then just go under and plug the new one in and the problem is solved. Now if you do not have a tool to reset the codes, try the local parts places as most of them will do a reset for you.
Testimonial: "thanks alot.i appreciate all your help .the explanation was very good.gonna go by dealer to get the part.ill let u know how it turned out."
SOURCE: Where is the EVAP vent solenoid located on a 2006
VENT SOLENOID ON A BRACKET NEXT TO GAS TANK.
SOURCE: I have a 1998 Cadillac
the pcm wont purge the solenoid if you're idling. rev up the motor a bit, its not a for sure thing the pcm will command it in park either, u may have to drive it and check it. the guys at the shop can activate it with there scan tool too. check those filler tubes carefully, if the shop smoked it from the port, sometimes it wont fill the filler neck. sometimes u cant see the smoke. look down inside the tube and check for cracks, esp if its plastic.
Has the battery been disconnected or been low on charge in the last 50 ignition cycles?
Code 12 means that battery power has been disconnected within the last 50 ignition cycles. it does not mean there is no battery power to the computer
Pin 3 should be a red/white wire that is the constat power supply to the PCM. It is protected by a fusible link located neer the drivers side strut tower. If that link was bad the car would not start or run as it also supplieds power to the asd relay, fuel pump relay, and the ssd relay.
I would put money on the the problem being igntion (plugs wires cap rotor), compression (low cylinder compression usually cylinders 2 and 3), lack of fuel delivery (low fuel pressure, a weak or dirty injector), timin (timing belt jumped, worn distributor, look exciter ring), or possibly a plugged catalytic converter.
I would check compression first especially cylinders 2 and 3. It was pretty common for the head gasket to fail in between these two cylinders.
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