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Home >> Chevrolet >> 2002 >> Monte Carlo LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.4L >> Diagnostic Tests >> DTC P0404: EGR System >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    This step verifies that the malfunction is present.

  2. 3

    If DTC P0404 will only set during certain conditions, the malfunction may be intermittent. Refer to Diagnostic Aids. If an intermittent wiring problem is not present, test for a faulty connection at the PCM or the EGR valve. If the connections are okay, and if DTC P0404 continues to set, replace the EGR valve.
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