Engine-Codes.com
Engine-Codes – Subaru – P1505 Subaru

P1505 Subaru Code - Idle Control System Circuit High Input

Quick Answer

The P1505 Subaru diagnostic trouble code (DTC) indicates an issue with the idle control system circuit having a high input. Common causes include Faulty idle air control valve (IAC), Damaged wiring or connectors in the idle control circuit, Malfunctioning throttle position sensor (TPS). 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
P1505 Subaru indicates Idle Control System Circuit High Input.
Common causes
Common causes include Faulty idle air control valve (IAC), Damaged wiring or connectors in the idle control circuit, Malfunctioning throttle position sensor (TPS).
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 Sep 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1505 Subaru Description

The P1505 Subaru diagnostic trouble code (DTC) indicates an issue with the idle control system circuit having a high input. In simpler terms, this means that there is a problem with the signal that controls the engine's idle speed. The idle control system is responsible for maintaining a consistent engine idle speed, ensuring smooth operation when the vehicle is stationary or in neutral gear. When this system malfunctions, it can lead to erratic idling, stalling, or even engine performance issues.

OBDII Code P1505 Subaru - Idle Control System Circuit High Input
P1505 Subaru Code - Idle Control System Circuit High Input

Common Causes of P1505 Subaru

  1. Faulty idle air control valve (IAC)
  2. Damaged wiring or connectors in the idle control circuit
  3. Malfunctioning throttle position sensor (TPS)
  4. ECM software issues or programming errors
  5. Vacuum leaks in the intake system

Symptoms of P1505 Subaru

  1. Rough or erratic idling
  2. Engine stalling at idle
  3. Poor acceleration or throttle response
  4. Check Engine Light (CEL) illuminated on the dashboard
  5. Reduced fuel efficiency

How to Fix P1505 Subaru

  1. Diagnose the root cause of the issue using a diagnostic scanner to retrieve the specific trouble codes and perform a thorough inspection of the idle control system components.
  2. Test the idle air control valve (IAC) and throttle position sensor (TPS) for proper operation and replace any faulty components as needed.
  3. Inspect the wiring harnesses and connectors in the idle control circuit for damage or corrosion, repairing or replacing any affected parts.
  4. Clear the trouble codes from the ECM and perform a reset procedure to recalibrate the idle control system.
  5. Test drive the vehicle to verify that the issue has been resolved and ensure that the engine idles smoothly and responds correctly to throttle input.

Cost to Fix P1505 Subaru

The typical repair costs for addressing the P1505 Subaru code can vary depending on the specific cause of the issue and the extent of repairs required. On average, the parts and labor for troubleshooting and repairing the idle control system circuit high input can range from $200 to $500. However, it's important to note that the actual costs may be higher or lower based on factors such as the location of the repair shop, the vehicle's make and model, and the availability of replacement parts. Additionally, diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically falling between $80 and $150. It's advisable to consult with a qualified mechanic or service center for a more accurate cost estimate tailored to your individual circumstances.

Need more information about the P1505 Subaru code?

Need more information on how to fix the P1505 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1505 Subaru code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about P1505 Subaru Code

1. What are the common symptoms of OBDII code P1505 in a Subaru related to the Idle Control System Circuit High Input?

Symptoms may include high idling speed, surging idle, stalling at low speeds, and potential difficulty in starting the vehicle.

2. What are the possible causes of OBDII code P1505 indicating an Idle Control System Circuit High Input issue in a Subaru?

Common causes can include a faulty idle air control valve, damaged wiring or connectors in the idle control system circuit, or a problem with the engine control module (ECM).

3. How can I diagnose the cause of OBDII code P1505 in my Subaru myself?

You can start by checking the wiring and connectors in the idle control system circuit for any visible damage or loose connections. You can also test the idle air control valve for proper functionality using a multimeter.

4. Can driving with an unresolved OBDII code P1505 issue in a Subaru cause further damage?

Continuing to drive with this issue may lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time.

5. How can I repair OBDII code P1505 related to the Idle Control System Circuit High Input in my Subaru?

Depending on the underlying cause, you may need to replace the idle air control valve, repair any damaged wiring or connectors, or reflash/reset the engine control module (ECM).

6. Is it safe to continue driving my Subaru with OBDII code P1505 present?

It is not recommended to drive your vehicle with this issue unresolved, as it can lead to further problems and potential safety hazards on the road.

7. Will resetting the OBDII code P1505 in my Subaru make the issue go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying problem is not addressed, the code is likely to reappear once the issue resurfaces.

8. Can a DIY enthusiast with basic automotive knowledge repair OBDII code P1505 in a Subaru?

Depending on the specific cause, some DIY repairs may be possible, such as checking and cleaning connectors or replacing the idle air control valve. However, complex issues may require professional diagnosis and repair.

9. How much can I expect to pay for repairing OBDII code P1505 related to the Idle Control System Circuit High Input in a Subaru?

Costs can vary depending on the exact cause of the issue and whether you choose to repair it yourself or take it to a mechanic. Repairs may range from a few hundred to over a thousand dollars.

10. Can extreme weather conditions affect the occurrence of OBDII code P1505 in my Subaru?

Extreme temperatures or humidity levels can sometimes exacerbate issues related to the idle control system, potentially triggering the OBDII code P1505.

Discuss the causes and fixes for P1505 Subaru OBDII Code

Submit a New Comment

Code P1505 Subaru comments

No comments found for this page.