Does anyone knows what would be wrong with my cruise control in a Peugeot 5008. It works normally in 4th and 5th gear, but it doesn't want to work in 6th gear.
Your Peugeot cruise control is 'speed sensitive'. Sixth gear cruise control requires a road speed of 70-75 MPH. The gearbox computes the gear required to maintain a given road speed, if you select a gear to high for the speed you are doing cruise control is switched 'off', to prevent the engine from labouring.