Trailer Stability Assist - Volvo XC90 Twin Engine 2019 Owner's Manual

STARTING AND DRIVING
|| Level control*
The car's system for level control endeavours to
maintain a constant height regardless of load (up
to the maximum permissible weight). When the
car is stationary the rear of the car lowers slightly,
which is normal.
When driving in hilly terrain and hot
climates
Under certain circumstances, there may be a risk
of overheating when towing a trailer. If the engine
and drive system overheats, a warning symbol
comes on in the driver display and a message is
displayed.
The automatic gearbox selects the optimum gear
depending on load and engine speed.
Steep inclines
Do not lock the automatic gearbox in a higher
gear than the engine "can cope with" - it is not
always a good idea to drive at a high gear with
low engine speed.
Parking on a hill
1. Depress the brake pedal fully.
2. Activate the parking brake.
3. Select gear position P.
4. Release the brake pedal.
Block the wheels with chocks when parking a car
with hitched trailer on a hill.
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Trailer Stability Assist

Electronic Stability Control
16
496
Starting on a hill
1. Depress the brake pedal fully.
2. Select gear position D.
3. Releasing the parking brake.
4. Release the brake pedal and start driving off.
Related information
Trailer stability assist* (p. 496)
•
Checking trailer lamps (p. 497)
•
Towing capacity and towball load (p. 670)
•
Overheating in the engine and drive system
•
(p. 488)
Adverse driving conditions for engine oil
•
(p. 674)
Trailer stability assist*
The function of trailer stability assist (TSA
stabilise cars towing trailers in situations where
they begin snaking. The function is included in
16
the stability system ESC .
Reasons for snaking
The snaking phenomenon can occur with any
car/trailer combination. Snaking normally occurs
at high speeds. However, there is a risk of it
occurring at lower speeds if the trailer is overloa-
ded or the load is improperly distributed, e.g. too
far back.
In order for snaking to occur, there must be a
triggering factor, e.g.:
Car with trailer subjected to a sudden and
•
powerful side wind.
Car with trailer drives on an uneven road sur-
•
face or in a pothole.
Sweeping steering wheel movements.
•
If snaking has started, it could be difficult or even
impossible to suppress. This makes the car/
trailer combination difficult to control and there is
a risk that you could, for example, end up in the
wrong lane or leave the carriageway.
15
) is to
* Option/accessory.