Home >> Jaguar >> 2018 >> XJR575 >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Common Specs & Procedures >> General Information - Diagnostic Trouble Code (DTC) Index (SASM - VDCM) -- XJ/X351 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) (G2721998) >> DTC U0401-81: Invalid Data Received From ECM/PCM "A" - Invalid serial data received >> Possible Causes