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Engine-Codes – Generic – P0671

P0671 Code - Cylinder 1 Glow Plug Circuit Fault

Quick Answer

The diagnostic trouble code P0671 indicates a fault in the cylinder 1 glow plug circuit. Common causes include Faulty glow plug in cylinder 1, Damaged wiring or connectors in the glow plug circuit, Malfunctioning glow plug control module. 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 indicates Cylinder 1 Glow Plug Circuit Fault.
Common causes
Common causes include Faulty glow plug in cylinder 1, Damaged wiring or connectors in the glow plug circuit, Malfunctioning glow plug control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0671 Description

The diagnostic trouble code P0671 indicates a fault in the cylinder 1 glow plug circuit. Glow plugs are essential components in diesel engines that help heat the combustion chamber during cold starts. When the engine is cold, the glow plug warms up to ignite the fuel mixture, aiding in a smooth start-up. A malfunction in the cylinder 1 glow plug circuit can lead to difficulty starting the engine, rough idling, increased emissions, and decreased fuel efficiency. If left unaddressed, this issue can cause damage to the engine, decrease overall performance, and potentially lead to more severe problems in the long run.

OBDII Code P0671 - Cylinder 1 Glow Plug Circuit Fault
P0671 Code - Cylinder 1 Glow Plug Circuit Fault

Common Causes of P0671

  1. Faulty glow plug in cylinder 1.
  2. Damaged wiring or connectors in the glow plug circuit.
  3. Malfunctioning glow plug control module.
  4. Poor electrical connections.
  5. Corrosion or buildup on the glow plug terminals.

Symptoms of P0671

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring.
  3. Increased smoke emissions from the exhaust.
  4. Decreased fuel efficiency.
  5. Illumination of the check engine light.

How to Fix P0671

  1. Perform a visual inspection of the glow plug, wiring, and connectors to check for any visible damage or corrosion.
  2. Test the glow plug resistance with a multimeter to determine if it is functioning properly.
  3. Check the wiring and connectors for continuity and repair or replace any damaged components.
  4. Test the glow plug control module for proper operation and replace if necessary.
  5. Clear the diagnostic trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix P0671

The typical repair costs for addressing a cylinder 1 glow plug circuit fault can range from $100 to $300, depending on the extent of the issue and the cost of parts and labor. It is important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. To obtain a more precise estimate, it is recommended to inquire about local rates from reputable auto repair facilities.

What does this mean?

Tech Notes for P0671





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When is the Code Detected?

The Engine Control Module (ECM) has detected a fault in the cylinder #1 glow plug circuit

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Code P0671 Information for Specific Makes

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 Code

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  • i replaced my fuel lines, when finished truck was in limp mode i had a po671 code and a po700 code cleared the po700 code truck was still in limp .. what next?

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  • The P0700 code means that there is a problem with the transmission, but it doesn't specify what the problem is. There must be another transmission code. What model and year is your vehicle?

    P0700 Code - Transmission Control System Malfunction
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