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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 80 (Engine Controls Self-Diagnostics - 5.0L & 5,7L) >> Diagnostic Tests >> DTC P1404: EGR Valve Closed Pintle Position >> Diagnostic Aids

Diagnostic Aids

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This diagnostic will detect the EGR pintle position not returning to the learned closed position due to foreign material lodged in the pintle seating area, or due to a defective EGR valve. The PCM will command the EGR valve fully open to attempt to clear the valve of any foreign material, although the vehicle must be at cruising speed for this to occur. If the third attempt to clear the valve is unsuccessful, DTC P1404 will set.

If DTC is determined to be intermittent, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.

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