GMC specific DTC OBD2 code: P1655 EVAP Purge Solenoid Control Circuit
GMC specific DTC OBD2 code: P1604 Loss Of IPC Serial Data
GMC specific DTC OBD2 code: P1622 Cylinder Select
GMC specific DTC OBD2 code: P1638 Generator F-Terminal Circuit
GMC specific DTC OBD2 code: P1656 Driver 2 Line 6
GMC specific DTC OBD2 code: P1605 Loss OF HVAX Serial Data
GMC specific DTC OBD2 code: P1623 Transmission Temp Pull-Up Resistor
GMC specific DTC OBD2 code: P1639 5 Volt Reference 2 Circuit
GMC specific DTC OBD2 code: P1606 Serial Communication Problem With Device 6
GMC specific DTC OBD2 code: P1624 Customer Snapshot Data Available