Volvo XC90: Starting and driving / Activating and deactivating Eco drive mode using the function button
There is a function button for Eco drive mode in the center display's Function
view if the vehicle is not equipped with a drive mode control in the tunnel console.
When the engine is switched off, Eco mode is deactivated and must therefore be
reactivated each time the engine is started. ECO will be displayed in the
instrument panel when the function is activated.
Selecting Eco drive mode in the center display's Function view
Tap the Driving Mode ECO button to activate or deactivate the function.

An indicator light in the button will illuminate when the function is activated.
Eco drive mode can help make driving more fuel-efficient and eco-friendly.
Use this mode to save fuel and promote ecofriendly driving.
When Eco mode is activated, the following characteristics are modified:
The automatic transmission's shifting points...
Start/Stop is a function that temporarily switches off the engine when the
vehicle has stopped, e.g. at a traffic light or in heavy traffic, and then starts
it again automatically when needed...
Other information:
Many of the vehicle's functions can be controlled from the center display. The
center display and its possibilities are presented below.
Three of the center display's basic views. Swipe to the right/left to access
Function or App view1.
Function view ‒ vehicle functions
that can be activated or deactivated with one tap...
Private locking is activated using the function button in the center display
and a PIN code.
NOTE
For the valet lock function to be activated the car must be in at least
ignition mode I.
Two codes are used for private locking:
A security code, which is created the first time the function is used...