U0405-84: Invalid Data Received From Cruise Control Module - Signal below allowable range: 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.

Check speed control module for additional DTCs and refer to relevant DTC index
Check speed control buttons and clock spring are not jammed/contaminated/damaged
Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the power supply and ground connections to the speed control module
Using the Jaguar Land Rover approved diagnostic equipment, clear all stored DTCs using the `Diagnosis Menu' tab and retest