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2014 RAM 2500
6.7L I6 Cummins Diesel•4WD•AUTOMATIC•diesel•turbo
16 active safety recalls on this vehicle — view recalls🏆Sponsored by Lost Pines Precision Automotive· Bastrop, TX
Repairs436Labor519Torque3583Fluid10DTC1037Battery1Maintenance0Recalls16
P1491moderate severityPowertrain

Radiator Fan Control Relay Circuit

on 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD

What this code means

The PCM has detected a malfunction in the radiator fan control relay circuit. This relay controls the main cooling fan operation and its failure can lead to engine overheating.

Symptoms

  • Check Engine Light
  • Engine overheating
  • Cooling fan not operating
  • A/C system poor performance
  • Temperature gauge rising in traffic

Common causes

  • Faulty radiator fan relay
  • Corroded relay socket or connector
  • Wiring damage in fan circuit
  • Failed cooling fan motor
  • PCM relay driver failure

Diagnostic steps

  1. Test radiator fan relay operation
  2. Apply direct power to fan motor to test
  3. Inspect relay socket and wiring
  4. Check PCM relay control signal
  5. Verify fan motor ground circuit

Repair notes

Replace the radiator fan relay and test the fan motor; repair wiring or replace fan motor if needed.

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