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All Ford fault codes

Idle and throttle

P1504 Idle air control valve circuit fault

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P1504 means: Idle air control valve circuit fault. The computer holds the idle speed steady with the throttle or an idle valve. OK to drive, but have it checked soon. The most common repair costs about €90–180 in Estonia, depending on make and model. The most common cause: dirty throttle body or idle valve.

Is it safe to drive?OK to driveOK to drive, but have it checked soon.
Valve replacement€90–180parts and labour in Estonia, depending on make and model

What it means

The computer holds the idle speed steady with the throttle or an idle valve. The speed is wrong or can't be held steady.

This is a make-specific code (Ford). The exact meaning can vary by model and year.

What you may notice

  • Idle hunts or is too high or low
  • The engine may stall
  • Engine light on

What could be wrong

  1. 1Dirty throttle body or idle valve · Valve replacement €90–180
  2. 2Air leak · Leak check and hose or gasket replacement €60–120
  3. 3Throttle needs relearning · Throttle body clean or replace €90–180
  4. 4Faulty idle valve · Valve replacement €90–180

Repair difficulty: Easy

What you can check yourself

Cleaning the throttle body often helps. After cleaning or disconnecting the battery, the throttle often has to be relearned. You can do the simpler checks yourself.

How we fix it

  1. We clean and relearn the throttle body
  2. We check for air leaks
  3. We replace the idle valve or throttle body

Standard SAE description: Idle Air Control Circuit Malfunction

This code usually comes with: Check engine lightSee what the light means →

Related symptoms: Rough idle or engine stalling

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P1504 mean?

Idle air control valve circuit fault. The computer holds the idle speed steady with the throttle or an idle valve. The speed is wrong or can't be held steady.

Can I drive with code P1504?

OK to drive, but have it checked soon.

How much does it cost to fix P1504?

It depends on the cause: valve replacement €90–180; leak check and hose or gasket replacement €60–120; throttle body clean or replace €90–180. Prices include labour at €45/h, depending on make and model.

How is P1504 fixed?

We clean and relearn the throttle body. We check for air leaks. We replace the idle valve or throttle body.

Related codes

P1505Idle air control at its adaptive limitP1506Idle speed too high (overspeed)P2102Throttle actuator: signal or voltage too low ("A")P2103Throttle actuator: signal or voltage too high ("A")P2104Throttle actuator: engine power limited by the computer (forced idle)P0124Throttle position sensor: signal drops out at times ("A")P1336Engine torque monitoring adaptation at limit

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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