AutoCodes – Honda – P1508 1999 Honda Civic

P1508 1999 Honda Civic Code - Idle Air Control Valve Circuit Malfunction

Quick Answer

The target idle speed is in the Engine Control Module (ECM) memory for various engine conditions (coolant temperature, A/C operation and so on). Common causes include Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted, Idle Air Control 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: P1508 1999 Honda Civic indicates Idle Air Control Valve Circuit Malfunction.
Common causes: Common causes include Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted, Idle Air Control 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 6,411

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 P1508 1999 Honda Civic Description

The target idle speed is in the Engine Control Module (ECM) memory for various engine conditions (coolant temperature, A/C operation and so on). The ECM keeps the actual idle speed at the target idle speed by switching the Idle Air Control Valve IACV) ON/OFF to control the intake airflow. If the IACV output duty cycle (the length of ON time) is out of a specified range, a malfunction is detected and a DTC is stored.

OBDII Code P1508 1999 Honda Civic - Idle Air Control Valve Circuit Malfunction - AutoCodes.com — P1508 1999 Honda Civic Code - Idle Air Control Valve Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1508 1999 Honda Civic?

Faulty Idle Air Control Valve
Idle Air Control Valve harness is open or shorted
Idle Air Control Valve circuit poor electrical connection

How to Fix the DTC P1508 1999 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1508 1999 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.

Need more information about the P1508 1999 Honda Civic code?

Need more information on how to fix the P1508 1999 Honda Civic 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 P1508 1999 Honda Civic Code

1. What are the common symptoms of OBDII code P1508 in a 1999 Honda Civic?

Symptoms may include stalling at idle, fluctuating idle speed, rough idle, and poor acceleration.

2. What causes the Idle Air Control Valve Circuit Malfunction in a 1999 Honda Civic?

Common causes of P1508 in a 1999 Honda Civic include a faulty idle air control valve, wiring issues, or a malfunctioning PCM.

3. How can I diagnose the Idle Air Control Valve Circuit issue in my 1999 Honda Civic?

Diagnosis involves checking the idle air control valve for proper operation, inspecting the wiring for damage, and scanning the vehicle for trouble codes.

4. Can I drive my 1999 Honda Civic with OBDII code P1508?

It is not recommended to drive with a P1508 code as it may lead to poor engine performance and potential stalling issues.

5. How can I repair the Idle Air Control Valve Circuit Malfunction in my 1999 Honda Civic?

Repair options include cleaning or replacing the idle air control valve, repairing any damaged wiring, and resetting the PCM.

6. Can a dirty throttle body cause OBDII code P1508 in a 1999 Honda Civic?

A dirty throttle body can contribute to idle issues, but it is not a direct cause of the P1508 code. It is still recommended to keep the throttle body clean for optimal performance.

7. Will resetting the ECU clear the P1508 code in my 1999 Honda Civic?

Resetting the ECU may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return.

8. How much does it cost to replace the idle air control valve in a 1999 Honda Civic?

The cost of replacing the idle air control valve can vary depending on the part quality and labor rates, but it typically ranges from $100 to $300.

9. Are there any DIY tips for fixing OBDII code P1508 in a 1999 Honda Civic?

DIY tips include checking and cleaning the idle air control valve, inspecting wiring for damage, and ensuring all connections are secure before seeking professional help.

10. Is OBDII code P1508 a common issue in 1999 Honda Civics?

While it may not be as common as some other codes, P1508 can still occur in 1999 Honda Civics due to age-related wear and tear on components like the idle air control valve.