AutoCodes – Isuzu – P0418 Isuzu

P0418 Isuzu Code - Secondary Air Injection Pump Control Circuit

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0418 Isuzu indicates Secondary Air Injection Pump Control Circuit.
Common causes: Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 4,732

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

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

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0418 Isuzu Description

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

OBDII Code P0418 Isuzu - Secondary Air Injection Pump Control Circuit - AutoCodes.com — P0418 Isuzu Code - Secondary Air Injection Pump Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0418 Isuzu?

Faulty Air Pump inoperative
Air bypass solenoid harness is open or shorted
Air bypass solenoid circuit poor electrical connection

How to Fix the DTC P0418 Isuzu?

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 P0418 Isuzu 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 P0418 Isuzu Code

1. What are the common symptoms of OBDII code P0418 in an Isuzu related to the Secondary Air Injection Pump Control Circuit?

- Common symptoms include the illumination of the Check Engine Light (CEL), rough idling, reduced engine performance, and potential increase in emissions.

2. What are the possible causes of OBDII code P0418 in an Isuzu?

- The code P0418 in an Isuzu is typically triggered by issues such as a faulty secondary air injection pump, damaged wiring or connectors in the circuit, or a defective air injection pump relay.

3. How can I diagnose the OBDII code P0418 in my Isuzu?

- To diagnose code P0418, you can use a scan tool to retrieve the trouble codes, check the secondary air injection pump and related components for any visible damage or loose connections, and perform a circuit test to identify the exact cause.

4. Can I continue driving my Isuzu with OBDII code P0418 present?

- It is not recommended to drive your Isuzu with code P0418 present, as it can lead to further damage to the emission control system and potentially affect the overall performance of the vehicle.

5. How can I repair OBDII code P0418 in my Isuzu?

- Repairing code P0418 involves replacing the faulty secondary air injection pump, repairing or replacing damaged wiring or connectors, and ensuring proper functioning of the air injection pump relay.

6. Are there any DIY tips for fixing OBDII code P0418 in an Isuzu?

- While some basic checks like inspecting for loose connections or damaged wires can be done as a DIY approach, it is recommended to seek professional help for a thorough diagnosis and repair of code P0418 in your Isuzu.

7. How much does it typically cost to repair OBDII code P0418 in an Isuzu?

- The cost of repairing code P0418 in an Isuzu can vary depending on the exact cause of the issue, but it may range from $200 to $600, including parts and labor.

8. Can a faulty secondary air injection pump cause OBDII code P0418 in an Isuzu?

- Yes, a faulty secondary air injection pump is a common cause of triggering code P0418 in an Isuzu, as it affects the control circuit and proper functioning of the emission control system.

9. Is OBDII code P0418 in an Isuzu an urgent issue that needs immediate attention?

- While code P0418 may not cause immediate drivability issues, it is important to address it promptly to prevent further damage to the emission control system and ensure the vehicle meets emissions standards.

10. How long does it take to repair OBDII code P0418 in an Isuzu?

- The repair time for code P0418 can vary depending on the exact cause and the extent of the repairs needed, but it typically takes a few hours to a full day to diagnose and fix the issue in an Isuzu.