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It could be a PATS security key problem, but I would like a little more information first.
How many keys do you have for the F150?How many miles on the F150?
Can you give me the VIN# ***** I can check Fords database?
Ford used a small flashing red light for the old PATS key system. Now in the 2014 and newer vehicles, they use the message center that shows starting system fault which is the same as the light. There is an issue with the PATS system, most likely the key, with that mileage. I asked for the VIN to check for any extended warranty from Ford on the F150. If it turns out to be the key, you will need to eventually get a replacement key for the bad one causing this problem. When you get the mailed key, disconnect the battery and let it sit for 5 minutes. Then reconnect the battery and use the new key to see if the truck starts. If you get the same problem with the new key, then you have another issue and testing will have to be done with the proper scan tool to properly locate the problem.