Home >> Cadillac >> 2016 >> XTS Premium, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 (M7U), 6T75 (M7V), Or 6T80 (Mhm) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Upshift Switch Circuit/Downshift Switch Circuit/Up and Down Shift Switch Circuit >> Diagnostic Fault Information