Question about 2000 Chevrolet Tahoe

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Service engine light keeps coming on. OBDII P0446

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  • Chevrolet Master
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Hi

This engine code is related to a malfunction in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

Probable causes are;

1- Purge or vent solenoids defective.
2- Defective wiring or bad connections in the vent valve/solenoid circuit.
3- Fuel saturated vapor canister.
4- Failed EVAP vent solenoid.

These engine codes are useful indicators to where the fault lies but usually require further troubleshooting to fully determine the underlying cause.

However I have listed the probable causes so to give you a starting point for your investigations.

Hope this helps. Please remember to rate my answer. Thanks.

Posted on Jul 17, 2009

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  • Chevrolet Master
  • 2,359 Answers

It's a fail EVAP vent test.

DO NOT TOP OFF the tank when you fill up the gas tank.

Make sure the gas cap is tight.

You will need to locate the vent solenoid/valve.

Attach hose on both end,apply 12V to the vent solenoid/valve and blow though it.

The passage has to be clear.

Clear it out and re-attach original hoses.

Clear the code and the P0446 should go away.


THE KEY IS DO NOT TOP OFF GAS TANK.

Posted on Jul 17, 2009

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Ok code PO446 is your vehicles EVAPORATIVE EMISSIONS SYSTEM the most common cause is the gas cap gor left offf and someone drove the car or the cap was not fully locked it will set the code
the other causes are leaking evaporative emission plumbing from the fuel tank to the engine compartment, someone changed the fuel pump and did not seal it properly,
Failure of a emission component in the evap system
The only way to diagnost these is an OBDII scan tool and a smoke machine the light will come on when the computer does its test of the system and there is a hole as small as .020"
1/20,000 of an inch !
The light can only be turned off by a OBDII scan tool

if you found this information helpful please give me a good rating

www.aceautomotive1.com
If you need any additional help on this please contact me

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