Home >> Land Rover >> 2016 >> Range Rover Autobiography >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Range Rover/L405 >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) >> Description And Operation >> DTC P0721-27: Output Shaft Speed Sensor Circuit Range/Performance - Signal rate of change above threshold >> Possible Causes