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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 P1406 - EGR Valve Position >> Diagnostic Aids

Diagnostic Aids

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

A vacuum leak will cause DTC P1406 to set. Check all vacuum lines and components connected to hoses for leaks or deformities. Check vacuum source to EGR solenoid assembly or EGR valve. Check for proper vacuum hose routing.

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