Cadillac specific DTC OBD2 code: P1545 A/C Clutch Relay Control Circuit
Cadillac specific DTC OBD2 code: P1544 A/C Refrigerant Condition Very Low
Cadillac specific DTC OBD2 code: P1543 A/C System Performance
Cadillac specific DTC OBD2 code: P1542 A/C System High Pressure High Temperature
Cadillac specific DTC OBD2 code: P1541 A/C High Side Over Temperature
Cadillac specific DTC OBD2 code: P1540 A/C System High Pressure
Cadillac specific DTC OBD2 code: P1539 Air Conditioning (A/C) Clutch Feedback Circuit High Voltage
Cadillac specific DTC OBD2 code: P1538 A/C request Circuit High Voltage
Cadillac specific DTC OBD2 code: P1537 A/C Request Circuit Low Voltage
Cadillac specific DTC OBD2 code: P1536 A/C System – ECT Overtemperature