Shut off while driving, engine cranks but does not start, blinking 1-6 code, PATS system?

1999 MERCURY GRAND MARQUIS
170,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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KELLYG69
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I was driving my car, and it just quit running, then it wouldn't start, it would turn over fine but wouldn't start. my security light on dash was blinking a 1-6 code.
Aug 19, 2024 at 8:31 AM
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STRAILER
  • ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
the security light blinking a 1-6 code, it’s an indication that the Passive Anti-Theft System (PATS) is preventing the engine from starting.

The 1-6 code indicates that the PATS system has detected an issue with the key or the communication between the key transponder and the PATS module.

Since the keys rarely go out, I would say the PATS module is having an issue, but you should check the fuses first.

Here is a guide to help:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

I have listed the fuses to check in the diagrams below, if the fuses are okay, I would replace the PATS module which I have included instruction for as well. You can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what happens.

Aug 19, 2024 at 10:52 AM
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KELLYG69
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Thanks for the help. I will let you know what happens.
Aug 19, 2024 at 10:58 AM
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STRAILER
  • ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Sounds good, have a great day.
Aug 20, 2024 at 8:43 AM
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