Home › Land Rover › 2015 › LR4 Base, AWD › 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 B1087-88: LIN Bus "A" - Bus off › Possible Causes