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2006 FORD EXPLORER
4.6L V8•4WD•AUTOMATIC•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor995Torque6816Fluid18DTC1746Battery2Maintenance0Recalls4
P1390low severityPowertrain

Octane Adjust Pin Out of Self-Test Range

on 2006 Ford Explorer 4.6L V8 · 4WD

What this code means

The octane adjust pin signal is not within the expected range during the self-test. This pin allows the PCM to adjust timing for different octane fuels.

Symptoms

  • Check Engine Light
  • Possible spark knock with low-octane fuel
  • Self-test failure

Common causes

  • Faulty octane adjust shorting bar
  • Wiring issue
  • PCM connector problem

Diagnostic steps

  1. Check octane adjust pin/shorting bar
  2. Inspect PCM connector
  3. Verify proper pin configuration for fuel grade

Repair notes

Check octane adjust shorting bar on PCM connector. Repair wiring if damaged.

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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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