AutoCodes – Honda – P1508 1996 Honda Civic

P1508 1996 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 1996 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 5,665

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 1996 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 1996 Honda Civic - Idle Air Control Valve Circuit Malfunction - AutoCodes.com — P1508 1996 Honda Civic Code - Idle Air Control Valve Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1508 1996 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 1996 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 1996 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 1996 Honda Civic code?

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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 1996 Honda Civic Code

1. What does the OBDII code P1508 mean on a 1996 Honda Civic?

P1508 indicates a malfunction in the Idle Air Control (IAC) valve circuit, which helps regulate the engine's idle speed.

2. What are the common symptoms of code P1508 in a 1996 Honda Civic?

Symptoms include rough or high idle, stalling, poor engine performance at idle, and possibly an illuminated check engine light.

3. What causes the P1508 code to appear on a 1996 Honda Civic?

Common causes include a faulty Idle Air Control (IAC) valve, damaged wiring or connectors in the IAC circuit, or a problem with the engine control module (ECM).

4. Can a dirty throttle body cause the P1508 code?

Yes, a dirty throttle body or buildup in the IAC valve can restrict airflow and trigger this code.

5. How can I diagnose the P1508 code in my 1996 Honda Civic?

Start by checking the IAC valve for clogs or damage, inspect the wiring and connectors for corrosion or breaks, and test the IAC valve with a multimeter to ensure proper operation.

6. Can I drive my 1996 Honda Civic with a P1508 code?

While it might still run, driving with this code is not recommended as it can lead to stalling and unsafe driving conditions.

7. How do I fix the P1508 code on a 1996 Honda Civic?

Clean or replace the IAC valve if it's dirty or defective, repair any damaged wiring or connectors, and reset the check engine light to verify the repair.

8. How much does it cost to fix the P1508 code on a 1996 Honda Civic?

Fixing this code typically costs $50â€“$300, depending on whether the IAC valve needs cleaning or replacement and whether wiring repairs are required.

9. Can a vacuum leak cause the P1508 code on a 1996 Honda Civic?

Yes, vacuum leaks can affect the idle control system and may contribute to triggering this code.

10. Do I need to reprogram the ECM after replacing the IAC valve for a P1508 code?

No, the ECM does not typically require reprogramming after replacing the IAC valve, but you should reset the check engine light and perform an idle relearn procedure if needed.