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Truck failed to start anti-theft flashes 11?

Tiny
GEORGE ANTHONY
  • MEMBER
  • 1999 FORD F-150
  • 4.3L
  • 6 CYL
  • 2WD
  • MANUAL
  • 195,000 MILES
I was having a misfire changed out the coil pack then truck went downhill, lost power, running too rich, then completely stopped starting, scanner read bad coil B, so I reverted back to the old one, the truck started up again, while it was running the battery cable terminal looked loses so I turned the truck off tighten the battery. The truck failed to start anti-theft flashes 11, but goes out after a bit, also my scanner does not pull up any codes.
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Tuesday, October 10th, 2023 AT 6:11 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
A flash pattern of "11" on some Ford vehicles can indicate a problem with the PATS system where it's not reading the key, or the key is not properly programmed. I would do a hard system reboot, here is how:

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

This should reset the system, please let me know what happens.
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Tuesday, October 10th, 2023 AT 9:44 AM

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