AutoCodes – Isuzu – P0671 Isuzu

P0671 Isuzu Code - Cylinder 1 Glow Plug Circuit Fault

Quick Answer

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 glow plug 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: P0671 Isuzu indicates Cylinder 1 Glow Plug Circuit Fault.
Common causes: Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 glow plug 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 9,753

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 05, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0671 Isuzu Description

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The Engine Control Module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, the ECM sets the OBDII code.

OBDII Code P0671 Isuzu - Cylinder 1 Glow Plug Circuit Fault - AutoCodes.com — P0671 Isuzu Code - Cylinder 1 Glow Plug Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P0671 Isuzu?

Faulty cylinder #1 glow plug
Cylinder #1 glow plug harness is open or shorted
Cylinder #1 glow plug circuit poor electrical connection
Faulty glow plug module

How to Fix the DTC P0671 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 P0671 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 P0671 Isuzu code?

Need more information on how to fix the P0671 Isuzu code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0671 Isuzu code diagnosed by a professional: Find a repair shop in your area

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 P0671 Isuzu Code

1. What does the OBDII code P0671 mean on an Isuzu?

The P0671 code indicates a fault in the glow plug circuit for cylinder 1, which may prevent proper glow plug operation.

2. What are common symptoms of the P0671 code on an Isuzu vehicle?

Symptoms include difficulty starting the engine in cold weather, rough idling, reduced power, and an illuminated check engine light.

3. What causes the P0671 code on an Isuzu?

Common causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or corrosion in the glow plug circuit.

4. Can I drive my Isuzu with the P0671 code?

While the vehicle may still run, it could have starting issues and reduced performance, especially in cold weather. Prolonged driving without repair may lead to further damage.

5. How do I diagnose the P0671 code on an Isuzu?

Diagnosis involves checking the condition of the cylinder 1 glow plug, inspecting the wiring and connectors for damage or corrosion, and testing the glow plug control module.

6. How do I fix the P0671 code on my Isuzu?

Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the glow plug control module.

7. What tools are needed to diagnose and fix the P0671 code?

Tools needed may include a digital multimeter, a diagnostic scanner, basic hand tools, and potentially a wiring diagram for the glow plug circuit.

8. How much does it cost to fix the P0671 code on an Isuzu?

Costs vary but typically range from $50 to $200 for parts and labor, depending on whether you need a new glow plug, wiring repair, or control module replacement.

9. Can a faulty glow plug cause other engine problems?

Yes, a faulty glow plug can lead to hard starting, increased emissions, and poor engine performance, especially in cold weather.

10. How can I prevent the P0671 code from occurring again?

Regular maintenance, including inspecting and replacing glow plugs as needed and ensuring the glow plug circuit wiring is in good condition, can help prevent this code.