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2007 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
1 active safety recall on this vehicle — view recalls🏆Sponsored by Timmehster
Repairs487Labor523Torque138Fluid11DTC1714Battery1Maintenance0Recalls1
P1199moderate severityPowertrain

Radiator Temperature Sensor Circuit Low

on 2007 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

The radiator temperature sensor signal voltage is too low, often a short to ground. No direct generic OBD equivalent.

Symptoms

  • Check engine light on
  • Cooling fan runs constantly
  • Inaccurate temp reading

Common causes

  • Shorted radiator temp sensor
  • Wiring shorted to ground
  • Corroded connector
  • Faulty PCM

Diagnostic steps

  1. Scan for stored codes
  2. Check sensor signal voltage
  3. Inspect wiring for short to ground
  4. Test sensor resistance
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