Home >> Land Rover >> 2016 >> LR4 Base >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Integrated Audio Module (IAM) - High Line -- LR4/L319 >> Diagnostic Trouble Code Index DTC: Integrated Audio Module (IAM) - High Line >> Description Of Operation >> DTC B121C-13: Hard Drive - Circuit open >> Possible Causes