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2018 TOYOTA CAMRY
2.5L I4•FWD•AUTOMATIC•gas•A25A-FKS
8 active safety recalls on this vehicle — view recalls
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Repairs413Labor483Torque4163Fluid7DTC1638Battery1Maintenance0Recalls8
P0597moderate severityPowertrain

Thermostat Heater Control Circuit/Open

on 2018 Toyota Camry 2.5L I4 · FWD

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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