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P1464 – What Does It Mean and How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

P1464 is an OBD-II Code that refers to Air Conditioning Demand Out Of Self Test Range (Ford)

Meaning

A P1464 code is a diagnostic trouble code that occurs when the PCM/ECM detects that the air conditioning demand is out of self-test range. This means that the air conditioning system is not working properly, and may need its circuit and relays checked.

A P1464 code is set and stored when the air conditioning demand is not within the normal range for a self-test. 

Causes

Common causes for this code include:

  • Throttle A/C Cutoff Relay circuit poor electrical connection or Open 
  • Bad A/C Demand Switch
  • Bad Wide Open Throttle A/C Cutoff (WAC) Relay
  • Throttle A/C Cutoff Relay harness is damaged

Symptoms

The symptoms of a P1464 code are:

  • Illuminated Check Engine Light
  • Inoperative air conditioning system

Diagnosis

To diagnose a P1464 DTC code, a technician would:

  1. Scan for codes in the ECM and look at the freeze frame data for failure.
  2. Visually inspect the wiring and connectors for damage.
  3. Check the A/C demand switch for proper operation.
  4. Check the throttle A/C cutoff relay for proper operation.
  5. Check the WAC relay harness for damage.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a P1464 code:

  • Not thoroughly inspecting all the wiring and connectors for damage.
  • Not checking the A/C demand switch for proper operation.
  • Not checking the throttle A/C cutoff relay for proper operation.
  • Not checking the WAC relay harness for damage.

How serious is this?

A P1464 code is a low-level fault and is not considered a serious code. However, it does indicate that there is a problem with the air conditioning system that should be addressed as soon as possible.

What repairs can fix the code?

The following are solutions that may fix this problem:

  • Repair or replace any wiring that is damaged
  • Replace the A/C demand switch
  • Replace the throttle A/C cutoff relay
  • Repair or replace the WAC relay harness

Related codes

A P1464 is related to and may be accompanied by the following codes:

P0401 – EGR Insufficient Flow Detected

P0563 – A/C Refrigerant Pressure Sensor Circuit High Voltage

P062A – Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input

Conclusion

In conclusion, the P1464 code is a diagnostic trouble code that refers to a problem with the Ford air conditioning system. There are several possible causes for this code, and the most common ones should be checked first. The code is not considered a serious fault, but it does indicate that there is a problem with the air conditioning system that should be addressed as soon as possible.