11-21-2013, 03:47 PM
Join Date: Mar 2013
Location: Wildwood, MO
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I had this issue last spring and it is NOT normal!!! My dealer could not duplicate the issue and the Ford tech line said to replace the PAM but it didn't fix the false beeping.
I luckily have some "friends" in upper management at the Kentucky Truck Plant and their answer was:
"99% of the time, a FALSE tone with nothing behind the unit is a SENSOR issue. 50% of the time, they are just dirty or ICE. Our sensors DO NOT LIKE ICE. The KEY thing here is to capture the truck exhibiting the concern and monitor the PIDS using the diagnostic tool (any Ford Dealer will have this). They will need to pull up the PIDS for the PAM module and monitor the rear sensors, the PID values are: LR_CNRD, LR_CTRD, RR_CNRD, RR_CTRD."
"A GOOD reading will read 100in with NOTHING behind the unit. But, if you can capture the beep while nothing is behind the unit, you will most likely see ONE of these values go anywhere from 0-40 in.
The sensor that is bad should be changed.
LR_CNRD Left Rear Corner
LR_CTRD Left Rear Center
RR_CNRD Right Rear corner
RR_CTRD Right Rear center
If you cant repeat it, I would suggest all 4 sensors be replaced."
They sent 4 new tested sensors to my dealer FEDX overnite and the problem never came back .