Po447 check engine code - 2007 Chevrolet Avalanche LTZ

code p 0447 refers to evaporative emission (EVAP) system vent control---open circuit ===causes --wiring open circuit--EVAP canister purge valve---ECM
code p 0453 refers to EVAP pressure sensor ---high input===causes --wiring short to positive ---EVAP pressure sensor --ECM

doubt check the gas cap will fix it, that usually throws a gross evap leak code. that code refers to the vent control circuit, specifically to the connectors at the evap canister behind the passenger wheel. it\'s pretty easy to get to, so get a nice flashlight and check the connector, my bet is that some water (as in the linked post) got in the connector or the connector itself is damaged.

Let us know if that worked. there is also a vent at the rear of the car where it expels the waste. What was the code?

Here's a link to your code YVON.

The purge valve solinoid is on top of the engine to the left of the alternator. It has an electrical connector and two smallish hoses, one to the intake manifold and one to the purge valve. Inspect both hoses for cracks and dry rot. Make sure you get them installed correctly. The one closest to the solenoid is to the manifold and the one at the end to the valve.
Disconnect the battery before replacing the valve.
A Common cause of OBDC errors. Some code readers can cycle through solenoids, tests AutoZone may not trouble with.

P0447....Evaporative Emission Control System Vent Control Circuit Open

its a fault for the vapour control circuit and according to teh read out it would appear that the motor isnt connected but its not a serious fault and you can drive the vehicle with no problem

PO 447 has to do with the EVAP emissions control circuit. This is what 'sucks' the gas fumes from the gas tank. The first thing to check is the gas cap. Is it tight? Is the seal cracked? If not, the EVAP purge valve may be bad or the rubber hose that goes to it has a leak.

All of these are evaporative emissions control related. If you just had the 440 I'd tell you to check your gas cap or don't fill up your vehicle with the engine running as this will trigger that code, but since you have the 446/7 codes which represent vent control circuits I'd say you may have atleast 1 of 3 things wrong which inlude a problem with the vapor pressure sensor, a broken vapor cannister, or a bad bypass valve. Toyota has had some problems with these on various models in the past. That is where I'd start. Before I spent a ton of money on parts I'd remove gas cap, visually inspect seal, or you could have cap pressure tested for any pressure loss which would cause a dtc (code to show up) or buy a new one they're cheap. Make sure you reinstall cap and turn until it clicks 3 times. You can have your codes erased and then start your vehicle a couple of times to see if engine light comes back on. If it does check my 3 earlier suggestions. Good luck and let me know how it turns out or if you need any further help

Research revealed no data availabe for code P0447 - doesn't exist for Hyundai Accent.

There are codes P0446 and P0445, but nothing with P0447.

CODE PO447 EVAP CANISTER VENT CONTROL VALVE CIRCUIT OPEN.POSSIBLE CAUSES. 1.HARNESS OR CONNECTORS THE SOLENOID VALVE CIRCUIT IS OPEN OR SHORTED. 2. EVAP CANISTER VENT CONTROL SOLENOID VALVE.