Home › Land Rover › 2015 › LR2 Base › Repair and Diagnosis › Engine Performance › Engine Control Systems › Diagnostic Trouble Code Index GTDI 2.0L Petrol, DTC: Engine Control Module (ECM) -- LR2/L359 › Diagnostic Trouble Code Index GTDi 2.0L Petrol, DTC: Engine Control Module (ECM) › Description And Operation › DTC P1623-43: Immobilizer Code Word/ID Number Write Failure - Special memory failure › Possible Causes