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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Electrical >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0520: Engine Oil Pressure Switch >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Command the All Indicators test ON and OFF with the scan tool, verify that the engine oil pressure indicator turns ON and OFF.
    • If the engine oil pressure indicator does not turn ON or OFF as commanded 

      Replace the P16 Instrument Cluster.

    • If the engine oil pressure indicator turns ON and OFF as commanded 
  3. Verify the scan tool Engine Oil Pressure parameter is Low.
    • If not Low 

      Refer to Circuit/System Testing.

    • If Low 
  4. Engine running.
  5. Verify actual engine oil pressure is within specified range. Refer to Oil Pressure Diagnosis and Testing in Displays and Gauges Component Replacement Reference .
  6. Verify the scan tool Engine Oil Pressure parameter is OK.
    • If not OK 

      Refer to Circuit/System Testing.

    • If OK 
  7. All OK.
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