GMC specific DTC OBD2 code: P1693 Tachometer Circuit Low Voltage
GMC specific DTC OBD2 code: P1692 Coolant Gage Circuit High Voltage
GMC specific DTC OBD2 code: P1691 Coolant Gage Circuit Low Voltage
GMC specific DTC OBD2 code: P1690 ECM Loop Overrun
GMC specific DTC OBD2 code: P1689 Delivered Torque Circuit Fault
GMC specific DTC OBD2 code: P1687 Driver 5 Line 7
GMC specific DTC OBD2 code: P1686 Driver 5 Line 6
GMC specific DTC OBD2 code: P1685 Driver 5 Line 5
GMC specific DTC OBD2 code: P1684 Driver 5 Line 4
GMC specific DTC OBD2 code: P1683 Driver 5 Line 3