Buick specific DTC OBD2 code: P1818 TFP Valve Position Switch-Drive Without Drive Ratio
Buick specific DTC OBD2 code: P1819 Internal Mode Swtich No Start, Wrong Range
Buick specific DTC OBD2 code: P1820 Internal Mode Switch Circuit A Low
Buick specific DTC OBD2 code: P1822 Internal Mode Switch Circuit B High
Buick specific DTC OBD2 code: P1823 Internal Mode Switch Circuit P Low
Buick specific DTC OBD2 code: P1825 Internal Mode Switch Illegal Range
Buick specific DTC OBD2 code: P1826 Internal Mode Switch Circuit C High
Buick specific DTC OBD2 code: P1831 PC Solenoid Power Circuit Low Voltage
Buick specific DTC OBD2 code: P1833 A/T Solenoids Power Circuit Low Voltage
Buick specific DTC OBD2 code: P1835 Kick-Down Switch