Home >> Land Rover >> 2015 >> LR4 HSE, AWD >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Navigation Control Module (NCM) - Extended Markets -- LR4/L319 >> Diagnostic Trouble Code Index DTC: Navigation Control Module (NCM) - Extended Markets >> Description And Operation >> DTC B1A81-4B: Internal Trip Switch - Over temperature >> Possible Causes