SOURCE: P0404B Code for Equinox 2005
If there was A Problem With EGR Valve stuck Open You WOULD KNOW IT as it would have a Performance Problem. I Think its a Falce Code and I Recomend CLEARING CODES and Starting over With a Clean slate. you Should Be Able to Disconnect the POS Batery cable for 30 Seconds to Clear it . try this Before Going to Dealership or Any Shop.
Please Dont forget to RATE ME PLEASE, Many do Forget, Thank You and Good Luck !!
SOURCE: The engine light on my 2005 Equinox is in,
The check engine light comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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