Question about 2002 Chevrolet Avalanche

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Service engine soon light came on.

I went to Autozone and got the code PO446. Any suggestions

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Computer thinks the pressure is wrong in the EVAP cannister. Cannister could be plugged, vent hose could kinked, sensor messed up, or the vent solenoid is busted.

1. Loose/faulty gas cap.
2. Evap Canister problem - bad solenoid, leakage, etc.
3. Bad fuel tank pressure sensor.

Posted on Feb 09, 2009

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That is an EVAP code. its a vent control code. you can manually test it by powering it up if you know where its at. i cant remember exaclty where its at off the top of my head but its only 2 wires. using a volt meter you want to make sure power is getting to it, but you cannot activate it without dealer scan tool.hmmm if you can figure out which is ground and power when you give it 12 volts it should click. meaning your vent solenoid works and you have wiring problems or its leaking.

EVAP problems are hard to finde with out scanners. you can change the vent solenoid and hope it fixes it. but a code points you to the direction of a problem. hopefull its not wiring problems. in the northern states with snow. ice can pull out wires and also get clogged in the vent solenoid and lock it up. its either wiring or bad or a leaking solenoid. check condition of wires. if they look good try a vent soleniod.

if that doesnt fix it after a engine light reset and 2 weeks or so. then goto dealer. you need to reset it after repair. light will not go off on its own.GOOD LUCK

Michael
ASE certified.
plz rate

Posted on Feb 09, 2009

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