B1681high severityBody

PATS Transceiver Module Signal Not Received

on 2015 Ford F-150 5.0L V8 Coyote · RWD

What this code means

The immobilizer module is not receiving a signal from the transceiver module. This prevents key reading and vehicle starting.

Symptoms

  • No-start condition
  • Security light on
  • Key not read

Common causes

  • Faulty transceiver module
  • Open wiring to transceiver
  • Poor connector contact
  • PCM/immobilizer communication fault

Diagnostic steps

  1. Scan for B1681
  2. Check transceiver power and signal wiring
  3. Inspect connectors for corrosion
  4. Replace transceiver module if faulty

Other Body codes on this vehicle

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