Home › Land Rover › 2015 › Range Rover Base › Repair and Diagnosis (Single Page) › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Transfer Case Control Module (TCCM) -- Range Rover/L405 › Diagnostic Trouble Code Index DTC: Transfer Case Control Module (TCCM) › Description And Operation › DTC P18A4-13: Motion/Position Sensor Power Circuit - Circuit open › Possible Causes