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2015 FORD F-150
3.5L V6 EcoBoost•RWD•AUTOMATIC•gas•turbo
14 active safety recalls on this vehicle — view recalls
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Repairs418Labor1009Torque7006Fluid18DTC3688Battery2Maintenance0Recalls14
P0597moderate severityPowertrain

Thermostat Heater Control Circuit/Open

on 2015 Ford F-150 3.5L V6 EcoBoost · RWD

What this code means

The PCM detected an open in the thermostat heater control circuit. The heated thermostat element cannot be energized to regulate coolant temperature.

Symptoms

  • Check engine light on
  • Slow engine warm-up
  • Coolant temperature fluctuations

Common causes

  • Open thermostat heater wiring
  • Faulty heated thermostat
  • Poor connector contact
  • PCM control circuit fault

Diagnostic steps

  1. Scan for thermostat heater codes
  2. Check heater circuit continuity
  3. Inspect thermostat connector
  4. Test heater element resistance
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