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2010 FORD EXPLORER
4.6L V8•4WD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor987Torque6774Fluid18DTC2254Battery2Maintenance0Recalls2
P1285high severityPowertrain

Cylinder Head Overtemperature Sensed

on 2010 Ford Explorer 4.6L V8 · 4WD

What this code means

The Cylinder Head Temperature (CHT) sensor has detected an overtemperature condition. The engine is running hotter than safe limits. This is a precursor to P1299 fail-safe activation.

Symptoms

  • Check Engine Light
  • Temperature gauge reading high
  • Reduced engine power
  • A/C may shut off automatically

Common causes

  • Low engine coolant level
  • Faulty thermostat stuck closed
  • Failed water pump
  • Clogged radiator
  • Failed cooling fan
  • Head gasket leak
  • Faulty CHT sensor

Diagnostic steps

  1. Check coolant level immediately
  2. Verify cooling fans are operating
  3. Test thermostat operation
  4. Check for coolant leaks
  5. Test CHT sensor readings vs actual temperature
  6. Pressure test cooling system

Repair notes

Stop driving if engine is actually overheating. Check coolant level and cooling system. Replace thermostat or water pump if faulty.

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