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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0521, P0522, or P0523 (without LM2) >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter: Engine Oil Pressure Sensor = 0 kPa (0 PSI)
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Verify the engine has the correct oil level and the correct oil pressure before continuing with this diagnostic.

    Displays and Gauges Component Replacement Reference 

  4. Engine Running
  5. Verify the scan tool parameter: Engine Oil Pressure Sensor = <special tool><special tool-no>CH-48027</special tool-no><special tool-desc>Digital Pressure Gauge</special tool-desc></special tool>
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  6. Verify the scan tool parameter: Engine Oil Pressure Sensor = Engine Oil Pressure - Gauge @ P16 Instrument Cluster
    • If not the specified state 

      Test or replace the component: P16 Instrument Cluster

    • Go to next step: If the specified state 
  7. All OK.
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