Question about 2000 Chevrolet S-10

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My service engine light is on and the code is PO446 with the emission system (Advance Auto confirmed the code). What do I need to replace to repair this problem?

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What engine? it could be a bad gas cap, thats about all you can check, a repair shop will need to go deeper to diagnose.

Posted on Sep 02, 2010

  • BlownBlueZ06 Jun 29, 2014

    It's often a loose or defective gas cap causing the trouble with Evap systems but that usually brings in a P0449. There's a leak in the vacuum circuit between the intake manifold and the fuel tank that causes P0449. A little background on the system: This code deals with the "Evap" code group. Evaporative Emissions. The engine vacuum is used to place a vacuum on your fuel tank to prevent the harmful fumes from being released into the atmosphere. Instead the fumes are run through the engine, being burned and after going through the catalytic converter are considered much less harmful to the environment. Also part of the system includes a vent valve and solenoid. The vent valve is responsible for helping control the level of vacuum in the tank. The solenoid is electronically controlled and used to also control the level of vacuum in the tank. There is a sensor in the tank that provides feedback as to the vacuum level. Any of these items being defective will bring in your code. Rock Auto offers a replacement solenoid for around 30 dollars. If you wish to avoid taking it in and want to try throwing parts at it, that's the easiest to try. It's called and "evap solenoid" It will be on top of your intake manifold, seen after removing the cover and have 2 wires going to it. I often see the plug have a red wire retainer on it. It will be plugged into a black cylinder shaped piece with 2 vacuum connections, one in and one out. There is a white clip on the connection. Push on one side of that white clip to release the vacuum connections. Best of luck.



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plz vote comment reply if you need more info

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P0446 Evaporative Emission System Vent Control Circuit.
The following are descriptions of all Evaporative possible codes:

P0441 Evaporative Emission System Incorrect Purge Flow
P0442 Evaporative Emission System Leak Detected (small leak)
P0443 Evaporative Emission System Purge Control Valve Circuit
P0444 Evaporative Emission System Purge Control Valve Circuit Open
P0445 Evaporative Emission System Purge Control Valve Circuit Shorted
P0446 Evaporative Emission System Vent Control Circuit
P0447 Evaporative Emission System Vent Control Circuit Open
P0448 Evaporative Emission System Vent Control Circuit Shorted
P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
P0450 Evaporative Emission System Pressure Sensor/Switch
P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance
P0452 Evaporative Emission System Pressure Sensor/Switch Low
P0453 Evaporative Emission System Pressure Sensor/Switch High
P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent
P0455 Evaporative Emission System Leak Detected (large leak)
P0456 Evaporative Emission System Leak Detected (very small leak)
P0457 Evaporative Emission System Leak Detected (fuel cap loose/off)
P0458 Evaporative Emission System Purge Control Valve Circuit Low
P0459 Evaporative Emission System Purge Control Valve Circuit High
At least the cap isn't loose for the gas tank.

I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.

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