GMC specific DTC OBD2 code: P1640 Driver 1-Input High Voltage
GMC specific DTC OBD2 code: P1607 Serial Communication Problem With Devise 7
GMC specific DTC OBD2 code: P1625 PCM System Reset
GMC specific DTC OBD2 code: P1641 FC Relay 1 Control Circuit
GMC specific DTC OBD2 code: P1608 Serial Communication Problem With Device 8
GMC specific DTC OBD2 code: P1626 Theft Deterrent Fuel Enable Signal Lost
GMC specific DTC OBD2 code: P1642 FC Relay 2 And 3 Control Circuit
GMC specific DTC OBD2 code: P1609 Loss Of TCS Serial Data
GMC specific DTC OBD2 code: P1627 A/D Performance
GMC specific DTC OBD2 code: P1643 Engine Speed Output Circuit