This is out of the manual, these are the things that disable the cruise control.
■ vehicle speed below approx.
■ the brake pedal is depressed,
■ the clutch pedal is depressed,
■ selector lever in N,
■ the Electronic Stability Control is
The only other final thing I can think of is a faulty switch or wiring fault on the circuits identified.
Hope that helps
Last edited by Richy; 3rd December 2020 at 14:16.