Home >> Land Rover >> 2017 >> Range Rover Autobiography >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Gateway Module (GWM) -- Range Rover/L405 >> Diagnostic Trouble Code Index DTC: Gateway Module (GWM) >> Description And Operation >> DTC B1412-87: Quiescent Relay Box - Missing message >> Possible Causes