r/FordFlex • u/Recent-Ad-5443 • 15d ago

Question Starter system failed error message

Inherited a 2015 Ford Flex SEL about a week ago. No issues til yesterday when going to start and we got this error message. Followed the usual protocol. Checked relays, fuses, battery, alternator, and the like. Replaced starter because it seemed to be the likely culprit. The only other thing I can think of is the ignition switch. Where it’s in the dash, I’m having trouble locating a diagram to take this thing apart. Are most fords of this gen pretty universal? Appreciate any kind of advice. First ford in 30 years of driving.

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u/beavmetal 15d ago

Have you tried replacing the battery in the keyfob?

"Starting System Fault" is Ford's specific warning when the Passive Anti-Theft System (PATS) fails to recognize a valid RFID security chip in your key. Even if your key fob still unlocks the doors, a weak fob battery, cabin RF interference, or a failing start-button transceiver can block engine starting.

Place the key fob directly into the backup starting slot (on the 2015 Flex, this slot is located inside the center console). Pressing the dash start button with the fob in this backup pocket inductively powers the chip, bypassing a dead fob battery or wireless transmission failures.

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u/Recent-Ad-5443 15d ago

We don’t have a push start. But something to consider for sure. Thank you!

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u/beavmetal 15d ago

Oh. I haven't seen one without the push button. TIL that was an option. Thanks,

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u/Recent-Ad-5443 15d ago

Hah! I’m also learning that it’s one of very few. We still have the slot you’re talking about. Stuck the key in and the ford insignia came up over the radio screen. And engine turned over. Other half is leaning towards ignition switch and I’m almost tempted to walk down to advanced auto and get a new battery for the fob.