Home >> Land Rover >> 2014 >> LR4 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Diagnostic Trouble Code Index DTC: General Proximity Sensor Module (GPSM) -- LR4/L319 >> Diagnostic Trouble Code Index DTC: General Proximity Sensor Module (GPSM) >> Description Of Operation >> DTC U0001-87: High Speed CAN Communication Bus - Missing message >> Possible Causes