GMC specific DTC OBD2 code: P1537 A/C Request Circuit Low Voltage
GMC specific DTC OBD2 code: P1536 A/C System – ECT Overtemperature
GMC specific DTC OBD2 code: P1535 A/C High Side Temperature Sensor Circuit
GMC specific DTC OBD2 code: P1534 A/C High Side Temperature Sensor Low Voltage
GMC specific DTC OBD2 code: P1533 A/C Evaporator Temperature Sensor Circuit High Voltage
GMC specific DTC OBD2 code: P1532 A/C Evaporator Temperature Sensor Circuit Low Voltage
GMC specific DTC OBD2 code: P1531 A/C Low Side Temerature Sensor Fault
GMC specific DTC OBD2 code: P1530 Ignition Timing Adjustment Switch Circuit
GMC specific DTC OBD2 code: P1529 Heated Windshield Request Problem
GMC specific DTC OBD2 code: P1528 Governor