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Engine-Codes – Generic – P1520

P1520 Code - Intake Manifold Runner Control Circuit Fault

Quick Answer

The P1520 code indicates a fault in the intake manifold runner control circuit. Common causes include Faulty Intake Manifold Runner Control Valve: The control valve responsible for adjusting the intake runner length may be defective or malfunctioning, Wiring Issues: Damaged or corroded wiring connections in the intake manifold runner control circuit can trigger this fault code, Vacuum Leaks: Leaks in the vacuum system that controls the intake manifold runner system can cause issues with the circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1520 indicates Intake Manifold Runner Control Circuit Fault.
Common causes
Common causes include Faulty Intake Manifold Runner Control Valve: The control valve responsible for adjusting the intake runner length may be defective or malfunctioning, Wiring Issues: Damaged or corroded wiring connections in the intake manifold runner control circuit can trigger this fault code, Vacuum Leaks: Leaks in the vacuum system that controls the intake manifold runner system can cause issues with the circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P1520 Description

The P1520 code indicates a fault in the intake manifold runner control circuit. The intake manifold runner control system is responsible for adjusting the length of the intake runners to optimize engine performance at different RPMs. The intake manifold runner control circuit fault can lead to issues with engine performance, fuel efficiency, and emissions. The system may not be able to adjust the intake runner length properly, resulting in poor engine performance and reduced power output. If left unresolved, this issue can lead to increased wear on the engine components and potentially cause further damage.

OBDII Code P1520 - Intake Manifold Runner Control Circuit Fault
P1520 Code - Intake Manifold Runner Control Circuit Fault

Common Causes of P1520

  1. Faulty Intake Manifold Runner Control Valve: The control valve responsible for adjusting the intake runner length may be defective or malfunctioning.
  2. Wiring Issues: Damaged or corroded wiring connections in the intake manifold runner control circuit can trigger this fault code.
  3. Vacuum Leaks: Leaks in the vacuum system that controls the intake manifold runner system can cause issues with the circuit.
  4. ECM/PCM Malfunction: A problem with the engine control module or powertrain control module can also lead to the P1520 code.

Symptoms of P1520

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Power: The vehicle may experience a loss of power or sluggish acceleration due to the intake manifold runner control circuit fault.
  3. Rough Idle: The engine may idle roughly or inconsistently, indicating a problem with the intake manifold runner control system.
  4. Poor Fuel Efficiency: The vehicle may consume more fuel than usual if the intake manifold runner control circuit is not functioning properly.

How to Fix P1520

  1. Diagnose the Issue: Use a scan tool to retrieve the fault code and perform a thorough inspection of the intake manifold runner control system.
  2. Check Wiring and Connections: Inspect the wiring harness and connections for any damage or corrosion, and repair or replace as needed.
  3. Test Intake Manifold Runner Control Valve: Test the functionality of the control valve and replace if faulty.
  4. Address Vacuum Leaks: Identify and repair any vacuum leaks in the system that may be affecting the intake manifold runner control circuit.
  5. Clear Codes and Test Drive: Clear the fault codes from the ECM/PCM, reset the system, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1520

The typical repair costs for resolving an intake manifold runner control circuit fault can vary depending on the specific cause of the issue. On average, the repair cost can range from $200 to $500, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It's recommended to consult with a trusted mechanic or dealership to get a more accurate estimate for this repair.

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Code P1520 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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