OBD Guide
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P1509

Idle Air Control Valve System High RPM

P1509 is an OBD-II diagnostic trouble code meaning: Idle Air Control Valve System High RPM. Common causes: idle air control valve (iac) malfunction, air leak in intake manifold. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • High idle speed (1000+ rpm)
  • Floating speed
  • Increased fuel consumption
  • Rough engine idling
  • Check Engine light comes on

Causes

  • Idle Air Control Valve (IAC) Malfunction
  • Air leak in intake manifold
  • Jammed throttle cable
  • Problems with the throttle position sensor
  • Open or short circuit in IAC control circuit

How to Fix

  1. Check and clean the idle air valve
  2. Check the tightness of the intake tract
  3. Check the condition of the throttle cable
  4. Check idle air valve control circuit
  5. If necessary, replace the idle air valve

Related codes

P0505P0506P0507

Error P1509 by Vehicle Brand

BMWBuickCadillacChevroletChryslerGMGMCJaguarMazdaOldsmobileSaturnVolkswagen

FAQ

What does the P1509 code mean?

P1509 is an OBD-II diagnostic trouble code that indicates: Idle Air Control Valve System High RPM

What causes a P1509 error code?

The most common causes of P1509 include: Idle Air Control Valve (IAC) Malfunction; Air leak in intake manifold; Jammed throttle cable; Problems with the throttle position sensor.

How do I fix a P1509 diagnostic trouble code?

To fix P1509: Check and clean the idle air valve. Check the tightness of the intake tract. Check the condition of the throttle cable. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1509?

Yes, but get it checked soon

How much does it cost to fix P1509?

The estimated repair cost for P1509 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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