Home >> Land Rover >> 2021 >> Discovery S >> 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 P1935-86: Brake Switch/Sensor Signal - Signal invalid >> Possible Causes