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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 238 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC P156A-P156C: Air Conditioning (A/C) Pressure >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify no other DTCs are set.
    • If no other DTCs are set 
  3. Install the appropriate Air Conditioning Service Center.
  4. Verify the high side pressure reading on the Air Conditioning Service Center is within 10% of the scan tool ECM A/C High Side Pressure Sensor parameter.
    • If the reading is within 10% 
  5. Refer to Air Conditioning (A/C) System Performance Test (R-134a)Air Conditioning (A/C) System Performance Test (R-1234yf) .
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