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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 P0400 - EGR Flow Malfunction >> Diagnostic Aids

Diagnostic Aids

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

The most likely cause of failure is a restricted vacuum line from the EGR valve to the vacuum "T" fitting.

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