Home >> Land Rover >> 2014 >> Range Rover Base >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> 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 P0726-21: Engine Speed Input Circuit Range/Performance - Signal amplitude < minimum >> Possible Causes