Question about 2002 Isuzu Rodeo
Diana2009: p0446 is a "Very" common code to pop up!
9 out of 10 times it has to do with the gas cap. The cap may have been loose or it may be failing. It is an EVAP code.
Do not buy an aftermarket cap! Buy an original equipment cap.
The aftermarket caps are often cheap, ones made in China and do not work or will not last very long.
Before spending money on any diagnostics in a shop, your truck is old enough where the cap could very well be the problem. It's a cheap enough gamble. You can probably get AutoZone to cancel the light for you for free.
Posted on Jul 17, 2009
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Posted on Jan 02, 2017
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Evaporative Emission Control System Vent Control Circuit Malfunction
What does that mean? Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:
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