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2002 FORD EXPLORER
4.0L V6 SOHC•4WD•AUTOMATIC•gas
10 active safety recalls on this vehicle — view recalls
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Repairs0Labor1011Torque10570Fluid18DTC1870Battery2Maintenance0Recalls10
B0402low severityBody

Tachometer Circuit Malfunction

on 2002 Ford Explorer 4.0L V6 SOHC · 4WD

What this code means

The tachometer gauge is not functioning or displays incorrect RPM readings.

Symptoms

  • Tachometer reads zero
  • Tachometer needle erratic
  • Tachometer bouncing at idle
  • Gauge needle stuck

Common causes

  • Instrument cluster stepper motor failure
  • Cluster circuit board fault
  • RPM signal issue from PCM
  • Wiring problem

Diagnostic steps

  1. Check RPM signal from PCM with scan tool
  2. Test tachometer stepper motor
  3. Inspect cluster circuit board
  4. Check wiring from PCM to cluster

Repair notes

Replace instrument cluster stepper motor or circuit board.

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