2001 Chevrolet Tahoe
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Greetings.
I have error code P0404, which is EGR system. Symptoms are jerky performance, transmission "hunting" between third and overdrive, and speedometer bouncing all over the place. No other error codes.
Could this just be the EGR valve, or am I potentially looking at the PCM?
Thanks
Frank
I would suspect you have a faulty EGR valve. The best way to test the valve is with a scan tool. The p0404 code is set when the actual EGR position does not match the commanded position sent to the valve from the pcm. IF you remove the valve and command a fixed position with a scan tool the valve should open to that position and hold. If the valve moves in and out when commanded to a fixed value then the position sensor inside the valve has failed and the valve needs to be replaced.
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