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2017 FORD F-150
5.0L V8 Coyote•RWD•AUTOMATIC•gas
18 active safety recalls on this vehicle — view recalls
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Repairs420Labor1001Torque8720Fluid18DTC2308Battery2Maintenance0Recalls18
B0103moderate severityBody

Immobilizer Antenna Ring Circuit

on 2017 Ford F-150 5.0L V8 Coyote · RWD

What this code means

Malfunction in the immobilizer antenna ring (transponder receiver coil) around the ignition lock cylinder or start button.

Symptoms

  • Intermittent no-start
  • Security light on
  • Key sometimes not recognized
  • Works with key held in specific position

Common causes

  • Faulty antenna ring coil
  • Wiring damage from steering column work
  • Connector loose
  • Coil winding open or shorted

Diagnostic steps

  1. Measure antenna ring resistance
  2. Inspect connector at steering column
  3. Check wiring from antenna to immobilizer module
  4. Test with oscilloscope for signal

Repair notes

Replace immobilizer antenna ring. Ensure connector is fully seated after steering column work.

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