DTC U0401-81: Invalid Data Received From ECM/PCM "A" - Invalid serial data received: Action

NOTE: This is not a vehicle harness issue or anti-lock brake system control module issue. The data source module has sent information which it has marked as Invalid

Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related Diagnostic Trouble Code(s) and refer to the relevant DTC index