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2018 FORD F-150
3.5L V6 EcoBoost•RWD•AUTOMATIC•gas•turbo
19 active safety recalls on this vehicle — view recalls
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Repairs424Labor1058Torque7215Fluid16DTC1932Battery2Maintenance0Recalls19
P1259high severityPowertrain

Immobilizer to PCM Signal Error

on 2018 Ford F-150 3.5L V6 EcoBoost · RWD

What this code means

The PATS (Passive Anti-Theft System) immobilizer is not communicating properly with the PCM. The security signal between the instrument cluster and PCM does not match, preventing proper engine operation.

Symptoms

  • Check Engine Light
  • Engine may not start
  • Security light flashing
  • Engine starts then dies

Common causes

  • Faulty transponder key
  • PATS transceiver malfunction
  • Instrument cluster communication error
  • PCM not properly programmed
  • Low battery voltage during key programming

Diagnostic steps

  1. Try a different programmed key
  2. Check PATS indicator light behavior
  3. Verify key is programmed (check NUMKEYS PID)
  4. Inspect PATS transceiver around ignition cylinder
  5. Check battery voltage

Repair notes

Try second key. Reprogram keys if needed. Replace PATS transceiver if faulty. May require dealer-level scan tool.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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