Home >> Land Rover >> 2021 >> Defender 110 X >> Repair and Diagnosis (Single Page) >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Near Field Sensing Module (NFSM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Near Field Sensing Module (NFSM) (G2807245) >> Description And Operation >> Near Field Sensing Module (NFSM) >> DTC U0400-81: Invalid Data Received - Invalid serial data received >> Possible Causes