GMC specific DTC OBD2 code: P1890 ECM Data Input Circuit
GMC specific DTC OBD2 code: P1887 TCC Release Switch Circuit
GMC specific DTC OBD2 code: P1886 Shift Timing Solenoid
GMC specific DTC OBD2 code: P1884 TCC Enable/Shift Light Circuit
GMC specific DTC OBD2 code: P1875 4WD Low Switch Circuit
GMC specific DTC OBD2 code: P1874 TCC Stator Temp. Switch Circuit High
GMC specific DTC OBD2 code: P1873 TCC Stator Temp. Switch Circuit Low
GMC specific DTC OBD2 code: P1871 Undefined Gear Ratio
GMC specific DTC OBD2 code: P1870 Transmission Component Slipping
GMC specific DTC OBD2 code: P1868 Transmission Fluid Life