Home >> Land Rover >> 2022 >> Range Rover Sport Autobiography >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Diagnostic Trouble Code Index DTC: Gateway Module (GWM) -- Range Rover Sport/L494 >> Diagnostic Trouble Code Index: Gateway Module (GWM) (G2165407) >> Description And Operation >> Gateway Module (GWM) >> DTC B1412-87: Quiescent Relay Box - Missing message >> Possible Causes