AutoCodes – Honda – P1508 1998 Honda Civic

P1508 1998 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 1998 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 6,265

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 1998 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 1998 Honda Civic - Idle Air Control Valve Circuit Malfunction - AutoCodes.com — P1508 1998 Honda Civic Code - Idle Air Control Valve Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1508 1998 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 1998 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 1998 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 1998 Honda Civic code?

Need more information on how to fix the P1508 1998 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 1998 Honda Civic Code

1. What are the common symptoms of OBDII code P1508 in a 1998 Honda Civic?

- Common symptoms include fluctuating idle speed, stalling at idle, rough idling, and potential engine misfires.

2. What could cause the Idle Air Control Valve Circuit Malfunction in a 1998 Honda Civic?

- Potential causes include a faulty idle air control valve, wiring issues, vacuum leaks, or a problem with the engine control module.

3. How can I diagnose the Idle Air Control Valve Circuit Malfunction in my 1998 Honda Civic?

- Diagnosis typically involves checking the idle air control valve for proper operation, inspecting wiring for damage, and using a scan tool to retrieve the trouble codes.

4. Can a dirty throttle body cause OBDII code P1508 in a 1998 Honda Civic?

- Yes, a dirty throttle body can disrupt the idle air control system's operation and contribute to the triggering of code P1508.

5. What are the potential repair options for fixing OBDII code P1508 in a 1998 Honda Civic?

- Repair options may include cleaning or replacing the idle air control valve, repairing damaged wiring, fixing vacuum leaks, or reprogramming the engine control module.

6. Is it safe to continue driving a 1998 Honda Civic with OBDII code P1508?

- It's not recommended to drive the vehicle with code P1508 as it can lead to poor engine performance, stalling, and potential damage if left unresolved.

7. Can I reset the OBDII code P1508 in my 1998 Honda Civic by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it's important to diagnose and address the underlying issue to prevent the code from reoccurring.

8. How much does it typically cost to repair OBDII code P1508 in a 1998 Honda Civic?

- The cost of repair can vary depending on the specific issue, but it may range from around $100 for simple fixes like cleaning the idle air control valve to several hundred dollars for more complex repairs.

9. Will code P1508 cause a 1998 Honda Civic to fail an emissions test?

- Yes, code P1508 can cause a vehicle to fail an emissions test due to its impact on engine performance and emissions control systems.

10. Can a DIY enthusiast fix OBDII code P1508 in a 1998 Honda Civic, or is it best left to a professional mechanic?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to address simple causes like cleaning the idle air control valve, but more complex issues may require professional intervention.