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Home >> GMC >> 2006 >> Envoy 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.2L - DTC P0420 To P1682 >> DTC P1400 >> Circuit/System Verification

Circuit/System Verification

Allow the engine to cool. Monitor the Cold Startup parameter, this should indicate Yes. Start and idle the engine for at least 2 minutes. DTC P1400 should run and pass.

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