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Home >> Chevrolet >> 1997 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 6.5L) >> Diagnostic Trouble Codes >> DTC P0404 - EGR System Performance >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

A vacuum leak or pinched vacuum will cause DTC to set. Check all vacuum lines and components connected to hoses for leaks, sharp bends or deformities. Check vacuum source to EGR solenoid assembly. Check for leak in EGR valve and for proper vacuum line routing.