Home >> Land Rover >> 2013 >> Range Rover Evoque Pure >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Adaptive Speed Control Module (ASCM) -- Range Rover EVOQUE/L538 >> Diagnostic Trouble Code Index DTC: Adaptive Speed Control Module (ASCM) >> Description And Operation >> DTC U0421-81: Invalid Data Received from Suspension Control Module A - Invalid serial data received >> Possible Causes