GMC specific DTC OBD2 code: P1636 PCM Stack Overrun
GMC specific DTC OBD2 code: P1635 5 Volt Reference 1 Circuit
GMC specific DTC OBD2 code: P1634 Ignition 1 Power Circuit Low Voltage
GMC specific DTC OBD2 code: P1633 Ignition Supply Power Circuit Low Voltage
GMC specific DTC OBD2 code: P1632 Theft Deterrent System-Fuel Disabled
GMC specific DTC OBD2 code: P1631 Theft Deterrent Start Enable Signal Not Correct
GMC specific DTC OBD2 code: P1630 Theft Deterrent Learn Mode Active
GMC specific DTC OBD2 code: P1629 Theft Deterrent System-Cranking Signal
GMC specific DTC OBD2 code: P1628 ECT Pull-Up Resistor
GMC specific DTC OBD2 code: P1627 A/D Performance