Home >> Land Rover >> 2021 >> Defender 110 SE >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Rear Differential Control Module (RDCM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Rear Differential Control Module (RDCM) (G2400909) >> Description And Operation >> Rear Differential Control Module (RDCM) >> DTC P18A4-12: Motion/Position Sensor Power Circuit - Circuit short to battery >> Possible Causes