AutoCodes – Honda – P0505 2000 Honda Civic

P0505 2000 Honda Civic Code - Idle Air Control Valve

Quick Answer

This system automatically controls engine idle speed to a specified level. Common causes include Faulty Idle Air Control Valve (IACV) valve, IAC valve harness is open or shorted, IAC valve circuit 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: P0505 2000 Honda Civic indicates Idle Air Control Valve.
Common causes: Common causes include Faulty Idle Air Control Valve (IACV) valve, IAC valve harness is open or shorted, IAC valve circuit 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 29,644

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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Table of contents Created and updated by William Orellana on May 18, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0505 2000 Honda Civic Description

This system automatically controls engine idle speed to a specified level. Idle speed is controlled through fine adjustment of the amount of air which by-passes the throttle valve via Idle Air Control Valve (IACV) and Auxiliary Air Control AAC) Valve. The IACV-AAC valve changes the opening of the air by-pass passage to control the amount of auxiliary air. This valve is actuated by a step motor built into the valve, which moves the valve in the axial direction in steps corresponding to the Engine Control Module (ECM) output signals.
One step of IACV-AAC valve movement causes the respective opening of the air by-pass passage. (i.e. when the step advances, the opening is enlarged.) The opening of the valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM then controls the step position of the IACV-AAC valve so that engine speed coincides with the target value memorized in ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warm-up, deceleration, and engine load (air conditioner, power steering, and cooling fan operation).

OBDII Code P0505 2000 Honda Civic - Idle Air Control Valve - AutoCodes.com — P0505 2000 Honda Civic Code - Idle Air Control Valve

What does this mean?

What are the Possible Causes of the DTC P0505 2000 Honda Civic?

Faulty Idle Air Control Valve (IACV) valve
IAC valve harness is open or shorted
IAC valve circuit poor electrical connection

How to Fix the DTC P0505 2000 Honda Civic?

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 does this mean?

Code Tech Notes

The problem is very common with Honda Civic, you can clean the idle air control valve and adjusting the engine idle speed (disconnect the battery and touch the two terminals together for an hour or so which will clear the ECM, connect the terminals back and start the car and let it idle of 15min without touching anything this usually takes care of the problem).

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0505 2000 Honda Civic 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.

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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 P0505 2000 Honda Civic Code

1. What does OBDII code P0505 indicate in a 2000 Honda Civic?

- OBDII code P0505 in a 2000 Honda Civic points to an issue with the Idle Air Control Valve (IACV).

2. What are the common symptoms of a faulty Idle Air Control Valve in a Honda Civic?

- Common symptoms include erratic idle speed, stalling at stops, and fluctuating RPMs when the vehicle is at a standstill.

3. What are the potential causes of OBDII code P0505 in a 2000 Honda Civic?

- The main causes of P0505 in a 2000 Honda Civic are a dirty or clogged IACV, a malfunctioning IACV motor, or a vacuum leak in the intake system.

4. How can I diagnose a faulty Idle Air Control Valve in my Honda Civic?

- Diagnosing a faulty IACV involves checking for vacuum leaks, testing the IACV motor, and inspecting the valve for carbon buildup or debris.

5. Can a dirty Idle Air Control Valve be cleaned, or does it need to be replaced?

- In many cases, a dirty IACV can be cleaned with throttle body cleaner to remove carbon deposits. However, if the valve is damaged, replacement may be necessary.

6. Are there any DIY repair tips for fixing OBDII code P0505 in a 2000 Honda Civic?

- DIY repair tips include checking and cleaning the IACV, inspecting vacuum hoses for leaks, and ensuring proper electrical connections to the valve.

7. How important is it to address OBDII code P0505 in a Honda Civic promptly?

- It is crucial to address P0505 promptly to prevent further engine performance issues and potential damage, such as poor fuel economy or engine stalling.

8. Can a malfunctioning Idle Air Control Valve affect the overall performance of a 2000 Honda Civic?

- Yes, a malfunctioning IACV can lead to poor idle quality, stalling, rough acceleration, and decreased fuel efficiency in a 2000 Honda Civic.

9. Is it safe to drive my Honda Civic with OBDII code P0505 present?

- It is generally not recommended to drive with P0505 present, as it can cause drivability issues and potentially lead to more severe problems if left unresolved.

10. How much does it typically cost to repair or replace an Idle Air Control Valve in a 2000 Honda Civic?

- The cost of repairing or replacing an Idle Air Control Valve in a 2000 Honda Civic can range from $150 to $400, depending on the extent of the issue and whether professional labor is involved.