Home >> Land Rover >> 2016 >> LR4 Base >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- LR4/L319 >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) >> Description And Operation >> DTC P279D-64: Four Wheel Drive (4WD) Range Signal Circuit - Signal plausibility failure >> Possible Causes