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1997 VOLVO S90
3.0L I6•AWD•AUTOMATIC•gas
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Repairs0Labor547Torque2350Fluid9DTC626Battery1Maintenance0Recalls0
P1481moderate severityPowertrain

Engine Cooling Fan Signal Low

on 1997 Volvo S90 3.0L I6 · AWD

What this code means

The ECM detected that the engine cooling fan speed feedback signal is lower than expected for the commanded fan speed. The fan may be running slower than requested or not at all.

Symptoms

  • Check Engine Light
  • Engine running hotter than normal
  • A/C not cooling efficiently
  • Fan noise abnormal

Common causes

  • Cooling fan motor degradation
  • Fan blade obstruction
  • Wiring resistance in fan circuit
  • Fan relay contact degradation
  • Fan control module signal issue

Diagnostic steps

  1. Test fan motor operation at various speeds
  2. Check for physical obstruction of fan
  3. Test fan circuit wiring resistance
  4. Test fan relay
  5. Monitor fan speed feedback signal

Repair notes

Replace the cooling fan motor if speed output is below specification.

Other Powertrain codes on this vehicle

🔧 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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