Home >> Land Rover >> 2019 >> Range Rover SVAutobiography >> Repair and Diagnosis >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) -- Range Rover/L405 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Automatic Temperature Control Module (ATCM) (G2164849) >> DTC B142D-4B: Left Rear Cooled/Heated Seat Thermal Electric Device #1 - Over temperature >> Possible Causes