Volvo S 90 Owner's Manual page 247

Electronic Stability Control (ESC)
symbols and messages
Symbol Message
Steady glow for 2 seconds
when the engine is started.
Flashing symbol.
Steady glow.
ESC
Temporarily off
Description
The system is performing a self-diagnostic test.
ESC is actively functioning to help counteract wheel spin and/or a skid.
Sport mode has been activated.
Please note that ESC is not deactivated at this time but its functionality is reduced.
See the message in the instrument panel.
DRIVER SUPPORT
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