AutoCodes – Subaru – P1505 Subaru

P1505 Subaru Code - Idle Control System Circuit High Input

Quick Answer

P1505 Subaru indicates Idle Control System Circuit High Input. Common causes include Faulty Idle Air Control (IAC) Solenoid Valve, IAC Solenoid Valve harness is open or shorted, IAC Solenoid Valve poor electrical connection. 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 (IAC) Solenoid Valve, IAC Solenoid Valve harness is open or shorted, IAC Solenoid Valve poor electrical connection.
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.

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Code Popularity 6,129

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1505 Subaru Description

OBDII Code P1505 Subaru - Idle Control System Circuit High Input - AutoCodes.com — P1505 Subaru Code - Idle Control System Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P1505 Subaru?

Faulty Idle Air Control (IAC) Solenoid Valve
IAC Solenoid Valve harness is open or shorted
IAC Solenoid Valve poor electrical connection
Large vacuum leak on engine

How to Fix the DTC P1505 Subaru?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1505 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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

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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.