Ford P1464:00 Code Meaning, Causes & How to Fix It
Ford DTC P1464:00 means “A/C Demand Out of Self-Test Range” — the PCM detected the A/C or defroster switch signal was on during a self-test when it shouldn’t have been. It is not an A/C pressure sensor code. It’s usually low-severity, often triggered simply because the A/C or defrost was left on during testing, but it can also point to a faulty Wide Open Throttle A/C Cutoff (WAC) relay, a bad A/C demand switch, or damaged wiring.
Quick Answer
Ford P1464:00 = A/C Demand Out of Self-Test Range. The PCM saw the A/C/defrost demand signal (ACCS input) was ON during a KOEO or KOER self-test. The “:00” means no additional sub-type detail was recorded. Most common causes: A/C left on during self-test, a faulty WAC relay, a bad A/C demand switch, or damaged wiring — not a refrigerant pressure sensor.
What Does Ford Code P1464:00 Actually Mean?
P1464 is a Ford manufacturer-specific code with the official definition “A/C Demand Out of Self-Test Range.” It sets when the Powertrain Control Module (PCM) runs its Key On Engine Off (KOEO) or Key On Engine Running (KOER) self-test and detects that the ACCS (A/C Clutch Cycling Switch / A/C demand) input was high — meaning the air conditioning or defroster was requesting to run during a test sequence where it should have been off.
That’s a different fault than a refrigerant pressure sensor problem. Codes for a bad A/C pressure transducer or low/high refrigerant pressure use different numbers (commonly in the P0530–P0534 or manufacturer-specific ranges). P1464 is specifically about the demand signal being on at the wrong time, not about refrigerant pressure itself.
What Does the “:00” After P1464 Mean?
The two digits after the colon are the Failure Type Byte (FTB), a standardized suffix defined in SAE J2012 / ISO 15031-6 that many newer Ford scan tools display alongside the base code. It tells you what kind of fault the module logged for that circuit. “:00” means “No Sub Type Information” — in other words, this is a generic occurrence of P1464 with no extra failure detail attached, not a separate or more serious code than plain P1464.
What Causes a P1464 Code on a Ford?
In order of how often each one actually turns out to be the cause:
| Cause | How Common | Typical Fix |
|---|---|---|
| A/C or defrost left on during KOEO/KOER self-test | Very common | Turn A/C and defrost off, clear the code, rerun the self-test |
| Faulty Wide Open Throttle A/C Cutoff (WAC) relay | Common | Test and replace the WAC relay (inexpensive part) |
| Bad A/C demand switch (on the A/C control head) | Common | Test switch continuity; replace if it fails |
| Damaged, corroded, or open WAC relay harness/connector | Occasional | Inspect and repair or replace the wiring/connector |
| Faulty PCM or PCM connection | Rare | Diagnose PCM inputs; repair or replace only after ruling out the above |
Is a P1464 Code Serious? Can You Still Drive With It?
P1464:00 is generally classified as a low-severity code. It won’t strand you, and in many cases the only symptom is an illuminated Check Engine Light with the A/C otherwise working normally — because the fault only exists inside the self-test logic, not in everyday driving. Some drivers do notice inconsistent A/C performance or the compressor clutch cycling oddly if the WAC relay or demand switch is genuinely bad, but it’s not a code that typically causes a driveability or safety issue. Still, since it can point to a real electrical fault, it’s worth diagnosing rather than ignoring indefinitely.
How to Diagnose Ford Code P1464:00
- Turn off the A/C and defrost before rerunning any self-test — this alone clears a large share of P1464 cases, since the code often just reflects the A/C being on during the test.
- Scan the PCM for codes and check freeze frame data to see what else was happening when the code set.
- Visually inspect the WAC relay harness and connectors for corrosion, bent or pushed-out pins, and chafed wiring.
- Test the A/C demand switch on the control head for correct continuity/operation using a multimeter.
- Test or swap the WAC relay with a known-good relay of the same rating to confirm whether it’s at fault.
- Clear the code and road test, running the A/C through a full cycle to confirm the fix holds.
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How Much Does It Cost to Fix a P1464 Code?
Data Callout: Diagnosing a P1464 code typically takes about 1.0 hour of shop labor, and independent shop labor rates generally run $75–$150 per hour. If the fix is a WAC relay (often $10–$40 for the part) or an A/C demand switch, total repair cost is usually on the lower end of typical A/C electrical repairs; wiring harness repairs or, rarely, PCM-related diagnosis push costs higher. (Source: DTC Decode – Ford P1464)
Because the most common cause costs nothing to fix — simply turning the A/C off before a self-test — it’s worth ruling that out before paying a shop for diagnosis. If the code keeps coming back with the A/C truly off, a WAC relay or demand switch swap is a low-cost next step most home mechanics can do themselves.
Which Ford Models Commonly Show This Code?
P1464 shows up across a wide range of Ford models that use this A/C demand self-test logic, including the F-150, Expedition, Fusion, Taurus, and Transit, spanning model years from the late 1990s through more recent PCM designs. The underlying cause (A/C demand signal, WAC relay, or wiring) is the same regardless of model — only the exact relay location and part number change.
The Daily Automotive editorial team notes: before you assume the worst, always turn the A/C and defrost fully off and let the vehicle sit for a minute before running a KOEO or KOER self-test. A false P1464 from the A/C simply being on during the test is far more common than an actual relay or switch failure.
Related Ford Diagnostic Codes
If you’re working through other Ford trouble codes, these guides may help: Ford P1747, Ford P0316, and if your A/C is cycling strangely even without a code, see why your car A/C turns on and off.
Frequently Asked Questions
What does Ford code P1464:00 mean?
Ford P1464:00 means “A/C Demand Out of Self-Test Range.” The PCM detected the A/C or defroster demand signal was on during a self-test when it should have been off. The “:00” suffix just means no additional sub-type detail was logged.
Is P1464 the same as an A/C pressure sensor code?
No. P1464 is about the A/C demand signal being active during a self-test, not about refrigerant pressure. A/C refrigerant pressure sensor faults use different, separate diagnostic trouble codes.
What causes a P1464 code on a Ford?
Most often the A/C or defrost was simply on during a KOEO/KOER self-test. Beyond that, the usual causes are a faulty Wide Open Throttle A/C Cutoff (WAC) relay, a bad A/C demand switch, or damaged/corroded wiring in the WAC relay circuit.
Can I still drive with a P1464 code?
Yes, in most cases. P1464 is a low-severity code and often has no effect on driveability, though the A/C may perform inconsistently if the underlying relay or switch is genuinely faulty. It’s worth diagnosing but isn’t an emergency.
How do you fix a P1464 code?
Turn off the A/C and defrost and rerun the self-test first, since that alone resolves many cases. If the code returns, inspect and test the WAC relay, the A/C demand switch, and the related wiring, then repair or replace whichever component fails testing.
How much does it cost to fix P1464?
Diagnosis typically takes about an hour of labor at $75–$150/hour. A WAC relay replacement is usually inexpensive ($10–$40 for the part), while a demand switch or wiring repair costs a bit more; total cost depends on which component actually failed.
