AC Refrigerant Temperature Sensor Circuit Malfunction (Ford)
What does P1466 mean?
The P1466 code means the vehicle's onboard diagnostic system has detected: AC Refrigerant Temperature Sensor Circuit Malfunction (Ford). This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- AC compressor cycles erratically
- Inconsistent cooling from the AC system
- Incorrect AC temperature reading on scan tool
- AC may freeze the evaporator
Probable Causes (Ranked by Likelihood)
- Faulty AC refrigerant temperature sensor Very High
- Corroded or damaged sensor connector High
- Open or shorted wiring to the sensor Moderate
- Moisture contamination in the AC system Moderate
- PCM internal circuit fault Low
Step-by-Step Diagnostic Procedure
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Read the AC refrigerant temperature sensor value on a scan tool. Compare to the actual ambient and evaporator temperatures.
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Unplug the sensor and measure its resistance. Compare to the manufacturer specification for the given temperature.
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Inspect the sensor connector for corrosion, water intrusion, or bent pins.
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Check the wiring from the sensor to the PCM for continuity and insulation damage.
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If the system has moisture contamination, evacuate and recharge with proper vacuum and new drier.
Frequently Asked Questions
What does the AC refrigerant temperature sensor do?
It monitors the temperature of the refrigerant to help the PCM control compressor cycling and prevent the evaporator from freezing. Incorrect readings cause poor AC performance or frozen evaporators.
Can a frozen evaporator be caused by this code?
Yes. If the sensor reports an incorrect temperature, the PCM may not cycle the compressor off when it should. This can cause ice to form on the evaporator, blocking airflow and resulting in no cold air.
Where is the refrigerant temperature sensor located?
On most Ford vehicles, it is located on or near the AC accumulator or the liquid line near the firewall. Consult a service manual for the exact location on your model.