2002 yukon parking assist quit working
{: ) 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.
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