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2013 MERCEDES-BENZ S65 AMG
6.0L V12 BiTurbo M275•RWD•AUTOMATIC•gas•M275•turbo
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Repairs423Labor488Torque3420Fluid8DTC1549Battery1Maintenance0Recalls0
P0483moderate severityPowertrain

Cooling Fan Rationality Check

on 2013 Mercedes-Benz S65 AMG 6.0L V12 BiTurbo M275 · RWD

What this code means

The PCM detected that cooling fan performance does not match expected values. This rationality fault indicates the fan system is not responding correctly to commands.

Symptoms

  • Engine overheating
  • Fan running at wrong speed
  • Warning lamp on

Common causes

  • Faulty cooling fan motor
  • Damaged wiring or connector
  • Faulty fan control module
  • Faulty PCM

Diagnostic steps

  1. Scan for stored codes
  2. Monitor commanded vs actual fan operation
  3. Inspect fan wiring and connectors
  4. Test fan module and PCM signals
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