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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (HVAC - Automatic) >> Diagnostic Information and Procedures >> DTC P156A-P156C >> Circuit/System Verification

Circuit/System Verification

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  1. Verify no other DTCs are set.
    • Go to next step: If no other DTCs are set 
  2. Connect - Pressure Gauge - Air Conditioning Refrigerant
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify the scan tool parameter:A/C High Side Pressure Sensor = Pressure Gauge - Within 10% of each other
    • Go to next step: If within 10% of each other 
  5. Refer to:Air Conditioning (A/C) System Performance Test