AutoCodes – Isuzu – P1406 Isuzu

P1406 Isuzu Code - EGR Valve Pintle Position Circuit

Quick Answer

The Powertrain Control Module (PCM) determines that the EGR valve is stuck open if the actual Exhaust Gas Recirculation (EGR) position and the learned closed EGR position vary by more than a predetermined value. Common causes include Faulty Exhaust Gas Recirculation (EGR) valve, Carbon blockage of the pintle. 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: P1406 Isuzu indicates EGR Valve Pintle Position Circuit.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) valve, Carbon blockage of the pintle.
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 11,361

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 Aug 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1406 Isuzu Description

The Powertrain Control Module (PCM) determines that the EGR valve is stuck open if the actual Exhaust Gas Recirculation (EGR) position and the learned closed EGR position vary by more than a predetermined value. The PCM tests for a stuck valve when the desired EGR position is at 0%. The PCM commands the EGR valve to 100% during certain driving conditions in order to clear a possible restriction from the EGR valve if the PCM determines that the valve is stuck open.

OBDII Code P1406 Isuzu - EGR Valve Pintle Position Circuit - AutoCodes.com — P1406 Isuzu Code - EGR Valve Pintle Position Circuit

What does this mean?

What are the Possible Causes of the DTC P1406 Isuzu?

Faulty Exhaust Gas Recirculation (EGR) valve
Carbon blockage of the pintle

How to Fix the DTC P1406 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 P1406 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.

Need more information about the P1406 Isuzu code?

Need more information on how to fix the P1406 Isuzu 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 P1406 Isuzu Code

1. What does OBDII code P1406 for Isuzu mean?

The P1406 code indicates a problem with the EGR valve pintle position circuit in an Isuzu vehicle.

2. What are the common symptoms of a P1406 code in an Isuzu?

Common symptoms include rough idling, engine stalling, decreased fuel efficiency, and an illuminated check engine light.

3. What causes the P1406 code in an Isuzu?

Potential causes of the P1406 code in an Isuzu include a faulty EGR valve, damaged wiring or connectors in the EGR system, or a malfunctioning EGR position sensor.

4. How can I diagnose the P1406 code in my Isuzu?

Diagnosing the P1406 code involves using an OBDII scanner to retrieve the code, inspecting the EGR valve and associated components for damage, and testing the EGR position sensor for proper functionality.

5. Can I drive my Isuzu with a P1406 code?

It is not recommended to drive your Isuzu with a P1406 code as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

6. How do I repair a P1406 code in my Isuzu?

Repairing a P1406 code may involve cleaning or replacing the EGR valve, repairing any damaged wiring or connectors, or replacing the EGR position sensor as needed.

7. Are there any DIY tips for fixing a P1406 code in an Isuzu?

While some basic inspections and cleaning of the EGR valve can be done DIY, it is recommended to have a professional mechanic diagnose and repair the issue to ensure proper resolution.

8. How much does it cost to fix a P1406 code in an Isuzu?

The cost of fixing a P1406 code in an Isuzu can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

9. Can a P1406 code in an Isuzu cause emissions test failure?

Yes, a P1406 code can cause an Isuzu to fail emissions testing due to increased emissions levels resulting from improper EGR valve operation.

10. How long does it take to repair a P1406 code in an Isuzu?

The repair time for a P1406 code in an Isuzu can vary based on the extent of the issue, but it typically takes a few hours to a full day for a mechanic to diagnose and fix the problem.