Home >> Land Rover >> 2021 >> Discovery R-Dynamic HSE >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Discovery/L462 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) (G2720552) >> DTC P0726-21: Engine Speed Input Circuit Range/Performance - Signal amplitude < minimum >> Possible Causes