P1460
Wide Open Throttle Air Conditioning Cutoff Circuit Malfunction
Get Your FREE AI Diagnostic Report
Enter your vehicle for a personalized diagnosis for code P1460
The P1460 is a Ford-specific code indicating a malfunction in the Wide Open Throttle (WOT) Air Conditioning Cutoff circuit. In Ford vehicles, the PCM is designed to temporarily disengage the AC compressor when the throttle is opened fully (such as during hard acceleration or passing). This frees up engine power that would otherwise be used to run the compressor, giving you maximum performance when you need it.
When the PCM detects excessive current draw when grounding the WAC circuit, or doesn't detect the expected voltage when it releases the circuit, it sets this code. The practical impact is relatively minor for most drivers — the AC may not properly disengage during hard acceleration, causing a slight power loss, or the relay may cause minor electrical issues.
The most common fix is replacing the WAC relay, which is typically located in the underhood fuse/relay box. It's an inexpensive part ($10–$30) and takes only minutes to swap. If the relay tests good, inspect the wiring between the relay and the PCM for damage. This code is low priority and safe to drive with, but should be addressed to ensure proper AC system operation and to turn off the check engine light.
Severity
Symptoms
- •Check engine light is on
- •Air conditioning may not shut off during hard acceleration
- •Slightly reduced engine power during wide-open throttle with AC on
- •AC compressor may cycle erratically
- •No obvious drivability issues in normal driving
Likely Causes
The relay that disengages the AC compressor clutch during wide-open throttle has failed, either stuck open or drawing excessive current when grounded by the PCM.
Open, shorted, or corroded wiring in the circuit between the PCM and the AC cutoff relay prevents proper relay control.
A malfunctioning AC pressure switch can interfere with the WAC circuit operation and cause the PCM to detect abnormal current or voltage readings.
The PCM's internal driver that controls the WAC circuit ground may have failed, preventing proper relay activation.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the wide open throttle AC cutoff relay
- Inspect and repair wiring in the WAC circuit
- Replace the AC pressure switch if faulty
- Check relay socket and PCM connector for corrosion