Ford c-max hybrid 2017 Owner's Manual page 176

Parking Aids
Troubleshooting the System
The system does not look for a space
The traction control system may be off.
The transmission is in reverse (R). Your vehicle must be moving forward to be able to
detect a parking space.
The system does not offer a particular space
The sensors may be covered (for example snow, ice or dirt buildup). Covered sensors
can affect the system's functionality.
There is not enough space for the parking maneuver on the opposite side of the parking
space.
The parking space is farther than 5 ft (1.5 m) away or closer than 16 in (40 cm).
Your vehicle is going faster than 22 mph (35 km/h).
You may have recently disconnected or replaced the battery. After a battery disconnect,
your vehicle must be driven on a straight road at a speed greater than 12 mph (20 km/h)
for up to 30 seconds.
The system does not position the vehicle where I want in the space
The vehicle is rolling in the opposite direction of the transmission (for example, rolling
forward when reverse [R] is selected).
An irregular curb along the parking space prevents the system from aligning the vehicle
properly.
Vehicles or objects bordering the space may not be positioned correctly.
The vehicle was pulled too far past the parking space. The system performs best when
you drive the same distance past the parking space.
The tires may not be installed or maintained correctly (for example, tires not inflated
correctly, improper tire size, or tires of different sizes).
A repair or alteration has changed detection capabilities.
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C-MAX Energi / C-MAX Hybrid (CCG) Canada/United States of America, enUSA, First Printing