GMC specific DTC OBD2 code: P1817 TFP Valve Position Switch-Reverse With Drive Ratio
GMC specific DTC OBD2 code: P1845 Transmission Gear Ratio Output Circuit
GMC specific DTC OBD2 code: P1887 TCC Release Switch Circuit
GMC specific DTC OBD2 code: P1818 TFP Valve Position Switch-Drive Without Drive Ratio
GMC specific DTC OBD2 code: P1847 2-3 Shift Solenoid Circuit High Voltage
GMC specific DTC OBD2 code: P1890 ECM Data Input Circuit
GMC specific DTC OBD2 code: P1819 Internal Mode Swtich No Start, Wrong Range
GMC specific DTC OBD2 code: P1850 Brake Band Apply Solenoid Circuit
GMC specific DTC OBD2 code: P1891 Throttle Position Sensor PWM Signal Low
GMC specific DTC OBD2 code: P1820 Internal Mode Switch Circuit A Low