Home › Land Rover › 2015 › LR2 HSE › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code Index DTC: Parking Aid Control Module (PACM) -- LR2/L359 › Diagnostic Trouble Code Index DTC: Parking Aid Control Module (PACM) › Description And Operation › DTC U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module - Missing message › Possible Causes