Home >> Land Rover >> 2016 >> LR4 Base >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index V6 S/C 3.0L Petrol, DTC: Engine Control Module (ECM) -- LR4/L319 >> Diagnostic Trouble Code Index V6 S/C 3.0L Petrol, DTC: Engine Control Module (ECM) >> Description Of Operation >> DTC P0504-27: Brake Switch A/B Correlation - Signal rate of change above threshold >> Possible Causes