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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls And Fuel - 6.0L (L96) - DTC P0351 To DTC P2636 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0420 Or P0430: Catalyst System Low Efficiency >> Repair Verification

Repair Verification

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install any components that have been removed or replaced during diagnosis.
  2. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
  3. Clear the DTCs with a scan tool.
  4. Turn Off the ignition for 60 s.
  5. Operate the vehicle within the Conditions for Running the DTC.
  6. Verify the scan tool Catalyst Monitor Not At Idle Test Conditions Met parameter changes to Yes.
    • If Yes is not displayed 

      Refer to step 5.

    • Go to next step: If Yes is displayed 
  7. When the conditions are safe, stop and idle the vehicle in gear if equipped with automatic transmission or neutral if equipped with manual transmission.
  8. Verify the Catalyst Monitor Test Result Bank 1 and Bank 2 parameters display Passed when performing the steps listed below:
    1. Apply the service brake.
    2. Monitor the scan tool Catalyst Monitor Test State parameter. When the parameter indicates Active, the Catalyst Monitor Test is running.
    3. Continue to monitor the parameter. When the parameter indicates Inactive, the Catalyst Monitor Test has completed.
      NOTE: When the test has completed, the Catalyst Monitor Test Counter Bank 1 and Bank 2 parameters will increment by one and the Catalyst Monitor Test Result Bank 1 and Bank 2 parameters will indicate Passed, Failed or No Result.
    4. Verify the scan tool Catalyst Monitor Test Result Bank 1 or Bank 2 parameter displays Passed.
    • If No Result is displayed 

      Repeat steps 5 - 8 until the Test Result parameters indicate Passed or Failed.

    • If Failed is displayed 

      Refer to Circuit/System Testing below.

    • Go to next step: If Passed is displayed 
  9. All OK.
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