FORD 2015 F-550 v.2 - Manual (Page 170)

PRINCIPLE OF OPERATION
The traction control system helps avoid
drive wheel spin and loss of traction.
If your vehicle begins to slide, the system
applies the brakes to individual wheels
and, when needed, reduces engine power
at the same time. If the wheels spin when
accelerating on slippery or loose surfaces,
the system reduces engine power in order
to increase traction.
USING TRACTION CONTROL
(Dual rear wheel vehicles only)
In certain situations (for example, stuck in
snow or mud), it may be beneficial to turn
the traction control system off. This allows
the wheels to spin with full engine power.
E162724
Turn the traction control system off by
pressing the stability control button
located on the instrument panel.
If you cannot turn the system off, see the
MyKey chapter for more information.
Placing your vehicle into four-wheel drive
mode automatically disables traction
control. Traction control operation will
resume when you place your vehicle back
into two-wheel drive mode.
Engine only traction control
(Dual rear wheel vehicles only)
Traction control system Stability control OFF
indicator
Button functions
Enabled Not illuminated Default at start-up
Disabled Illuminated Button pressed momentarily
Enabled Not illuminated Button pressed again after
deactivation
Disabled Illuminated Transfer case switched to
4WD*
*Engaging 4WD automatically disables the traction control system.
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Super Duty (), enUSA
Traction Control