Parking assistant disabled

'year make model' would help, but here are a few that you can.

https://www.google.com/search?q=disable+park+assist

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Parking Aid Navigator The parking aid system consists of the following:

• one radar sensor (located in the center of the rear bumper)
• two ultrasonic parking aid sensors (located on the left and right side of the rear bumper)
• parking aid module (located behind the LH C-pillar trim panel)
• parking aid speaker-audible warning tone (located in the parking aid module)

Expedition The parking aid system consists of the following:

• four ultrasonic parking aid sensors (located in the rear bumper)
• parking aid module (located behind the LH C-pillar trim panel)
• parking aid speaker-audible warning tone (located on the parking aid module)
• reverse gear select input (to the parking aid module from the reverse lamp circuit)
• The parking aid system is enabled when the ignition switch is in the RUN position and REVERSE is selected. The system can be disabled through the message center RESET switch located in the instrument cluster. The parking aid menu is displayed until the transmission is taken out of REVERSE. While the menu is displayed, pressing the message center RESET switch changes the parking aid system status to OFF.

refers to shift switch mechanism under dash or down on the tranny

THE PARKING ASSIST MODULE ENABLES THE RIGHT SIDE OF THE INSTRUMENT CLUSTER

{: ) I wonder what quit do you mean? But anyway, there are certain conditions that can disable your park assist temporarily, like the park brakes on, park assist switch disable on, an object is attached to the rear of the vehicle, dirty sensors, overspeed, speed sensors malfunction and more.
If ever one of your sensors are not working, or maybe a module or wiring problem, then it can permanently disable the park assist system, unless the problem is quickly addressed.
The most practical and fast way of tracing the cause is to use a scan tool. It will read all the codes and datas that are relevant to the problem, it can also tell which of the four sensors are at fault, thereby reducing the time of guessing.
For the moment, you can check the VEH B/U fuse 10amp at the underhood fuseblock, and IGN 1 fuse 10amps at the IP fuseblock. Goodluck.

{: ) The PARK ASSIST OFF message will be displayed when the parking assist system is disabled due to conditions that disable or inhibit the system. The object alarm module requests the DIC display PARK ASSIST OFF when it detects one of the following conditions:
• The parking assist system is manually disabled using the driver information center (DIC). • An object is attached to the rear of the vehicle, such as a trailer, bicycle rack, trailer hitch receiver, or tow bar. • The object alarm sensors are covered by snow, mud, dirt, slush, or ice. • The vehicle bumper is damaged. • Excessive paint thickness on a replacement object alarm sensor. • The object alarm sensors are disrupted by vibrations, like those caused by a large nearby vehicle or from heavy equipment such as a jackhammer.
The SERVICE PARK ASSIST message will be displayed when the object alarm module detects a malfunction in the parking assist system and the system is disabled. It could be one of your sensors is at fault or even the module.

{: ) The driver information center (DIC) displays SERVICE PARK ASSIST when the object alarm module detects a malfunction in the parking assist system and the system is disabled. The DIC also displays SERVICE PARK ASSIST when a loss of communication occurs with the object alarm module. Usually this is caused by faulty components or wirings. Better visit your dealer if still under warranty, for one park assist sensor only costs too much. If your bumper had been knocked off or had previous repairs outside the dealership, that's another thing.
The PARK ASSIST OFF message is displayed in the DIC when the parking assist system is disabled due to conditions that disable or inhibit the system. The object alarm module requests the DIC display PARK ASSIST OFF when it detects one of the following conditions:
• The parking assist system is manually disabled using the driver information center (DIC). • An object is attached to the rear of the vehicle, such as a trailer, bicycle rack, trailer hitch receiver, or tow bar. • The object alarm sensors are covered by snow, mud, dirt, slush, or ice. • The vehicle bumper is damaged, • Excessive paint thickness on a replacement object alarm sensor. • The object alarm sensors are disrupted by vibrations, like those caused by a large nearby vehicle or from heavy equipment such as a jackhammer.

If the engine starts, but wont shift out of park, you should check that your brake lights are working. The interlock solenoid is powered by the brake light switch, if the fuse is blown or if the brake light switch is bad, the car wont shift out of park...I hope this helps.

{: ) SERVICE PARK ASSIST The driver information center (DIC) displays SERVICE PARK ASSIST when the park assist module detects a malfunction in the object detection system and sends a request to the DIC for display of the message. The DIC also displays SERVICE PARK ASSIST when there is a loss of communication with the park assist module.
PARK ASSIST OFF The PARK ASSIST OFF message is displayed in the DIC when the park assist system is disabled due to conditions that disable or inhibit the system. The red LED in the rear display, as well as, the telltale in the switch will be lit, notifying the driver the PARK ASSIST system is disabled. The object alarm module requests the DIC via the serial data circuit to display PARK ASSIST OFF when it detects that one of the following conditions is true:
• The object alarm system is disabled through DIC vehicle customization feature. Refer to the Owners Manual for more information. • An object is attached to the rear of the vehicle, such as a trailer, bicycle rack, or hitch receiver. • An object is hanging out of the endgate. • The park brake is not fully released. • The system receives vibrations from a large nearby vehicle or from a heavy equipment such as a jackhammer. In the case of objects attached to the rear of the vehicle such as a trailer, hitch receiver, or a bicycle rack, or objects hanging out of the endgate, the rear parking assist (RPA) will have an Automatic Object induced disable feature where the RPA will determine if the rear object is moving with the vehicle. If the RPA detects such a condition, the park assist will be disabled. The PARK ASSIST OFF message will continue to be displayed until the trailer hitch receiver is removed and the vehicle is driven forward above 24 km/h (15 mph).

I had this situation too, exactly. Everybody told me it was probably a rear bumper sensor gone bad, but at least in my case, no such luck. It was the Park Assist Module, basically the control computer for the whole system. A new one fixed it, but was about $300.