Possible causes
– EGR volume control valve stuck open or closed
– Faulty EGR volume control solenoid valve
– EGR volume control solenoid valve harness is open or shorted
– EGR volume control solenoid valve circuit poor electrical connection
– EGR temperature sensor and circuit
– Faulty EGR volume control solenoid valve
– EGR volume control solenoid valve harness is open or shorted
– EGR volume control solenoid valve circuit poor electrical connection
– EGR temperature sensor and circuit
When is the obd code mean?
The PCM calculates an error based on the difference between the actual EGR position and the desired EGR position. The PCM sets the P0404 code if the error is too great.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Possible engine hesitation
– Possible engine hesitation
P0404 CHEVROLET OBD Code Description