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2017 GMC ACADIA
2.5L I4•AWD•AUTOMATIC•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor483Torque4233Fluid9DTC1251Battery1Maintenance0Recalls4
P1629high severityPowertrain

Theft Deterrent Cranking Signal

on 2017 GMC Acadia 2.5L I4 · AWD

What this code means

The PCM is not receiving the expected cranking signal through the theft deterrent system during startup. The system cannot verify that the vehicle is being started with the correct key.

Symptoms

  • Vehicle will not start
  • Security light on
  • Engine cranks but does not run
  • Intermittent no-start

Common causes

  • Faulty ignition switch
  • Passlock sensor issue
  • BCM malfunction
  • Wiring fault in cranking signal circuit

Diagnostic steps

  1. Check security system status
  2. Test cranking signal at PCM
  3. Inspect ignition switch operation
  4. Test Passlock sensor
  5. Check BCM communication

Repair notes

Test ignition switch and Passlock sensor. Perform security relearn if needed.

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