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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 354 (Engine Controls And Fuel - 3.6L (LGX) - DTC P0010 To DTC P0459) >> Diagnostic Information and Procedures >> DTC P0420 or P0430: Catalyst System Low Efficiency >> Circuit/System Testing

Circuit/System Testing

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  1. Verify the conditions listed below do not exist with the appropriate catalytic converters:
    • Dents
    • Severe discoloration caused by excessive temperatures
    • Road damage
    • Internal rattles caused by damaged catalyst substrate
    • Restrictions
      • If a condition is found 

        Replace the catalytic converter.

      • If no condition is found 
  2. Verify the conditions listed below do not exist with the exhaust system:
    • Leaks
    • Restrictions
    • Physical damage
    • Loose or missing hardware
      • If a condition is found 

        Repair or replace the component as necessary.

      • If no condition is found 
  3. Verify the conditions listed below do not exist with the appropriate B52B Heated Oxygen Sensor 2:
    • Not at the correct torque
    • Damage
      • If a condition is found 

        Replace the B52B heated oxygen sensor 2 or repair the condition as necessary.

      • If no condition is found 
  4. Test or replace the exhaust front pipe and the catalytic converters.
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