Rear Parking Sensor Error Code?

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2014 Mazda 5 GT
The rear parking sensor on my 2014 5 appears to be throwing up an error code of sorts when start the car. It's a set of 3 beeps, 5 times and I notice the light on the parking sensor button blinking. When I set the car in reverse, the warning beeps go off as if there's an obstruction in the back when there isn't. It'll stop after a short period and then when I actually go to park the sensors work as they should.

I did get rear ended in a low speed impact a while back but didn't file a claim since there didn't any visible damage. I suspect that is the cause of this issue. Does anyone have any input on what the issue might be? Would OBD2 spit out a code if I connected to it?
 
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