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:
The remote key can be used to unlock the tailgate while keeping the rest of
the vehicle locked.
Press the button on the remote
key.
The tailgate will be unlocked but remain closed.The side doors remain
locked and armed. The lock and alarm indicator on the dashboard will go
out to indicate that the vehicle is no longer fully locked...
With the Auto-hold brake function, the driver can release the brake pedal
and the brakes will remain applied, for example, when the vehicle has stopped at
a traffic light or intersection.
When the vehicle stops, the brakes are activated automatically...