Engine-Codes - Ford - P1285 1999 FORD F150

P1285 1999 FORD F150 - Cylinder Head Over Temperature Condition

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1285 1999 FORD F150 Possible Causes

  • Engine overheated
  • Low engine coolant level
  • Faulty Cylinder Head Temperature (CHT) Sensor
  • Cylinder Head Temperature Sensor harness is open or shorted
  • Cylinder Head Temperature Sensor circuit poor electrical connection

How is the P1285 1999 FORD F150 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1285 1999 FORD F150 code

Labor: 1.0

The cost to diagnose the P1285 1999 FORD F150 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1285 1999 FORD F150 Meaning

The Cylinder Head Temperature (CHT) Sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature.
The CHT sensor is installed in the aluminum cylinder head and measures the metal temperature. The CHT sensor can provide complete engine temperature information and can be used to infer coolant temperature. If the CHT sensor conveys an overheating condition to the PCM, the PCM initiates a fail-safe cooling strategy based on information from the CHT sensor. A cooling system concern such as low coolant or coolant loss could cause an overheating condition. As a result, damage to major engine components could occur. Using both the CHT sensor and fail-safe cooling strategy, the PCM prevents damage by allowing air cooling of the engine and limp-home capability.
The Diagnostic Trouble Code (DTC) indicates the Cylinder Head Over Temperature Sensed Indicates an engine overheat condition was sensed by the cylinder head temperature sensor.

More Information

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