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

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Adaptive speed control is disabled. The instrument cluster displays a warning message CRUISE NOT AVAILABLE.

Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index