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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1139 (Engine Controls Diagnosis - 3.6L (Ly7) (DTC P0135 To DTC P0420)) >> Diagnostic Trouble Codes >> DTC P0420 >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The ECM determines that the catalyst efficiency has degraded below a calibrated threshold.

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