You can fix these yourself somewhat. You may notice the slightest dip in fuel economy as well. What are the symptoms of code P0449? The more trouble codes there are, the easier it can be to diagnose a problem. I have an 03 Silverado 5. For minor problems like a faulty or incorrectly installed gas cap, it is not serious at all. I always locate it where the text tells me to. Once the vent valve is replaced or re-installed and all electrical connections are secure, clear all codes and retest the system to see if the code returns.
However, as this is a generic code, the actual definition can vary from one vehicle to another. P0455 has to do with the evap system as well. Could be the Canister — have to lower the Fuel Tank to get to it, Could be a shorted wire in the harness, Could be the Vent Valve, Could be a circuit fuse. You may try disconnection the hose and blow through it with both key off and on and see if air will pass through. Step 1 Record all codes present, as well as all available freeze frame data. Took the part off my silverado, put the replacement on which gm told me is not the right part , cleared the codes, and bingo no more light after 3 consecutive starts.
Good luck figuring out what is causing your Chevy Cobalt to throw the P0449 code. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine. On some applications the valve is connected to the charcoal canister, while on others, the actual valve may be located some distance away. This means that regardless of which make or model of vehicle, the code will mean the same thing Silverado or not, as long as it was manufactured after 1996. Hope this info is helpful. Finally, the mechanic should check the purge control solenoid for operation if all other components are in good working order.
A very wide range of repairs may be needed to fix the P0469 code, as there is no single underlying cause in all instances. Chance you got a bad replacement valve is not likely. If there is anything that you feel like you could add, please feel free to leave a comment below. Diagnosing the P0469 code can be tricky. Make sure before you unplug the battery cable, you turn off everything you can like radio, air, heat, lights, ect.
Step 4 If all electrical values fall within specifications, it should be possible to manually activate the vent valve repeatedly with the scanner if the scanner has that capability. I'm having to go back to the store for the 3rd time. The P0449 is a test that is run on the vent solenoid circuit to check the electrical functions in basic terms. Cobalt P0449 Trouble Code Causes There are many things that can cause the P0449 trouble code to trigger in your Chevy Cobalt. There is also one hose that connects to the top of the tank that we have seen come loose. © 2008 General Motors Corporation. Also, a really good scanner will help you identify whether or not the valve is operating correctly.
If the valve has died and is stuck open, that can be the huge leak. Looked on filler neck didnt see anything that looked like seloind. Dont have the Manual yet probably will go get the manual tomorrow. Byron ran into this about 2 weeks ago - bought part number 25932569 - evap canister for 50 bucks from the dealership. It is also possible that maybe a vent hose is clogged or kinked somewhere.
How does a mechanic diagnose the P0469 code? However, in other instances, the supply of fuel to the engine could become limited, leaving the vehicle unable to be driven. Make sure if you contact your local dealership that you have your vehicles vin number available. I know this because I own a 2006 silverado, and a 2006 suburban. Pay particular attention to the voltage that reaches the solenoid. I have replaced them on many diffrent models. I wouldn't wait too long to further diagnose and repair. Also,, over filling the gas tank regularly can cause early failure of this kind of part.
After the vehicle is parked, the temperature in the tank continues to rise for a period of time, then starts to drop. P0455 - Evaporative Emission Control System Leak Detected no purge flow or large leak What does that mean? Looked at the suburban when the part went bad on the silverado from overfilling the tank and bingo, same part. This information can useful to diagnose intermittent faults. Get under the vehicle after putting on the parking brake and if you a little hefty, then removing the spare tire on the Chevrolet Avalanche will give you lots more room. About once a week it showed up — intermittently.