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Engine-Codes – Generic – P1559

P1559 Code - Idle Speed Control Throttle Position Adaption Malfunction

Quick Answer

The P1559 diagnostic trouble code (DTC) indicates an issue with the idle speed control throttle position adaption system on the vehicle. Common causes include Throttle position sensor failure: A malfunctioning throttle position sensor can send incorrect signals to the ECM, leading to idle speed control issues, Throttle body issues: Carbon buildup or mechanical failures in the throttle body can hinder proper throttle position adaption, Idle air control valve malfunction: A faulty idle air control valve can disrupt the engine's idle speed control system. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P1559 indicates Idle Speed Control Throttle Position Adaption Malfunction.
Common causes
Common causes include Throttle position sensor failure: A malfunctioning throttle position sensor can send incorrect signals to the ECM, leading to idle speed control issues, Throttle body issues: Carbon buildup or mechanical failures in the throttle body can hinder proper throttle position adaption, Idle air control valve malfunction: A faulty idle air control valve can disrupt the engine's idle speed control system.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1559 Description

The P1559 diagnostic trouble code (DTC) indicates an issue with the idle speed control throttle position adaption system on the vehicle. This system is responsible for monitoring and adjusting the engine's idle speed to ensure smooth operation while the vehicle is stationary. When this system malfunctions, it can lead to erratic idle speeds, rough idling, stalling, and other performance issues.

OBDII Code P1559 - Idle Speed Control Throttle Position Adaption Malfunction
P1559 Code - Idle Speed Control Throttle Position Adaption Malfunction

Common Causes of P1559

  1. Throttle position sensor failure: A malfunctioning throttle position sensor can send incorrect signals to the ECM, leading to idle speed control issues.
  2. Throttle body issues: Carbon buildup or mechanical failures in the throttle body can hinder proper throttle position adaption.
  3. Idle air control valve malfunction: A faulty idle air control valve can disrupt the engine's idle speed control system.
  4. Vacuum leaks: Leaks in the vacuum system can cause air leaks, affecting the engine's idle speed.
  5. ECM programming errors: Incorrect programming of the ECM can result in idle speed control malfunctions.

Symptoms of P1559

  1. Erratic idle speed: The engine may idle at inconsistent speeds, fluctuating between high and low RPMs.
  2. Rough idling: The vehicle may experience a rough or shaky idle, indicating a lack of proper idle speed control.
  3. Stalling: The engine may stall unexpectedly when coming to a stop or at idle.
  4. Poor acceleration: The vehicle may exhibit sluggish acceleration due to improper throttle position adaption.
  5. Check Engine Light: The illumination of the Check Engine Light on the dashboard may indicate the presence of this DTC.

How to Fix P1559

  1. Diagnose the issue: Use a diagnostic scan tool to retrieve the DTC and perform a thorough inspection of the throttle position sensor, throttle body, idle air control valve, and vacuum system.
  2. Clean or replace components: Clean the throttle body and idle air control valve to remove any carbon buildup, or replace faulty components as needed.
  3. Reset the idle speed control system: Perform an idle relearn procedure to recalibrate the throttle position adaption system.
  4. Check for vacuum leaks: Inspect the vacuum system for leaks and repair any damaged hoses or connections.
  5. Update ECM software: If necessary, update the ECM software to address any programming errors contributing to the issue.

Cost to Fix P1559

The cost of repairing the idle speed control throttle position adaption malfunction can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It's important to note that diagnostic time and labor rates can vary, so it's advisable to consult with a professional mechanic for a more accurate estimate based on the vehicle make and model.

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Code P1559 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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