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P1523 Manufacturer-specific Basic entry

Intake Manifold Runner Control (Stuck Open)

Updated 2026-10-10 · Manufacturer-specific powertrain

Severity
Medium
Typical repair cost
80 – 600 EUR
System
Powertrain

This is a manufacturer-specific code. Its exact meaning can differ between makes; the definition below follows the most common usage.

What it means

P1523 is stored when the engine control module commands the Intake Manifold Runner Control ( ) to move but the feedback shows it stays in one position. The cause is mechanical binding, carbon or dirt, or a failed actuator.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

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Symptoms

  • Check engine light on
  • Rough or unstable idle
  • Hesitation or poor acceleration
  • Increased fuel consumption
  • Possible limp mode with reduced power

Common causes

  1. Carbon, varnish or dirt build-up blocking movement
  2. Worn or seized actuator mechanism
  3. Broken return spring or linkage
  4. Failed position feedback sensor giving a false reading
  5. Low supply voltage to the actuator motor

How to diagnose

  1. Command the Intake Manifold Runner Control ( ) with a scan tool and watch the feedback position
  2. Remove and inspect the component for carbon, dirt or mechanical damage
  3. Clean the mechanism and check it moves freely through its full range
  4. Measure supply voltage and resistance of the actuator motor
  5. Replace the actuator if it still does not follow commands

Frequently asked questions

Can I keep driving with P1523?

Usually yes for a short time, but expect reduced performance or higher fuel use. Have it diagnosed within a few days.

Will clearing P1523 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

P1524

Nearby codes in this group