Engine-Codes.com
Engine-Codes – GMC – P0673 2014 GMC Sierra

P0673 2014 GMC Sierra Code - Cylinder 3 Glow Plug Circuit Fault

Quick Answer

The P0673 code indicates a malfunction in the glow plug circuit for cylinder 3 in a 2014 GMC Sierra. Common causes include Faulty Glow Plug: A malfunctioning glow plug for cylinder 3 that fails to heat properly, Wiring Issues: Damaged or corroded wiring in the glow plug circuit that affects electrical flow, Bad Glow Plug Relay: A defective relay that fails to supply power to the glow plug. 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
P0673 2014 GMC Sierra indicates Cylinder 3 Glow Plug Circuit Fault.
Common causes
Common causes include Faulty Glow Plug: A malfunctioning glow plug for cylinder 3 that fails to heat properly, Wiring Issues: Damaged or corroded wiring in the glow plug circuit that affects electrical flow, Bad Glow Plug Relay: A defective relay that fails to supply power to the glow plug.
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 Oct 02, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0673 2014 GMC Sierra Description

The P0673 code indicates a malfunction in the glow plug circuit for cylinder 3 in a 2014 GMC Sierra. Glow plugs are critical components in diesel engines, designed to preheat the combustion chamber for easier starting, especially in cold weather. When the engine control module (ECM) detects an abnormal voltage or resistance in the glow plug circuit for cylinder 3, it triggers this diagnostic trouble code (DTC).

OBDII Code P0673 2014 GMC Sierra - Cylinder 3 Glow Plug Circuit Fault
P0673 2014 GMC Sierra Code - Cylinder 3 Glow Plug Circuit Fault

Common Causes of P0673 2014 GMC Sierra

  1. Faulty Glow Plug: A malfunctioning glow plug for cylinder 3 that fails to heat properly.
  2. Wiring Issues: Damaged or corroded wiring in the glow plug circuit that affects electrical flow.
  3. Bad Glow Plug Relay: A defective relay that fails to supply power to the glow plug.
  4. Poor Electrical Connections: Loose or corroded connectors that disrupt the circuit.
  5. ECM Malfunction: A fault in the engine control module that misinterprets signals from the glow plug circuit.

Symptoms of P0673 2014 GMC Sierra

  1. Hard Starting: Difficulty starting the engine, particularly in cold weather conditions.
  2. Rough Idling: The engine may idle unevenly or shake due to incomplete combustion.
  3. Increased Emissions: Higher levels of exhaust emissions due to inefficient fuel burning.
  4. Loss of Power: Noticeable decrease in engine power and acceleration.
  5. Check Engine Light: The illumination of the check engine light on the dashboard.

How to Fix P0673 2014 GMC Sierra

  1. Diagnostic Testing: Use an OBD-II scanner to confirm the P0673 code and check for any additional codes that may indicate related issues.
  2. Visual Inspection: Inspect the glow plug wiring and connectors for signs of damage, corrosion, or loose connections.
  3. Test Glow Plug: Remove and test the glow plug for cylinder 3 using a multimeter to check for proper resistance.
  4. Replace Faulty Components: Replace any defective glow plugs, wiring, or relays as necessary based on the diagnostic findings.
  5. Clear Codes and Test Drive: After repairs, clear the DTCs and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.

Cost to Fix P0673 2014 GMC Sierra

** The typical repair costs for addressing a P0673 code can vary widely based on the specific issue identified during diagnostics. On average, the cost of parts (including glow plugs, wiring, or relays) can range from $50 to $300. Labor costs can add an additional $80 to $150 per hour, depending on the shop's location and expertise. Given that diagnosing and repairing the glow plug circuit may take 1 to 3 hours, total repair costs could range from $200 to $600.

Need more information about the P0673 2014 GMC Sierra code?

Need more information on how to fix the P0673 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0673 2014 GMC Sierra 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 P0673 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P0673 in a 2014 GMC Sierra related to the Cylinder 3 Glow Plug Circuit Fault?

The common symptoms include rough idling, decreased engine performance, difficulty starting the engine, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0673 in a 2014 GMC Sierra indicating a Cylinder 3 Glow Plug Circuit Fault?

The possible causes include a faulty glow plug in cylinder 3, damaged wiring or connectors in the glow plug circuit, or issues with the glow plug control module.

3. How can I diagnose the Cylinder 3 Glow Plug Circuit Fault in my 2014 GMC Sierra with OBDII code P0673?

You can diagnose the issue by using a scan tool to read the OBDII trouble code, visually inspecting the glow plug in cylinder 3, checking the wiring and connectors for damage, and testing the glow plug control module.

4. Can I still drive my 2014 GMC Sierra with OBDII code P0673 indicating a Cylinder 3 Glow Plug Circuit Fault?

It is not recommended to drive the vehicle with this fault as it can lead to poor engine performance and potential damage. It is best to address the issue promptly.

5. How do I repair the Cylinder 3 Glow Plug Circuit Fault in my 2014 GMC Sierra triggering OBDII code P0673?

To repair the fault, you may need to replace the glow plug in cylinder 3, repair or replace any damaged wiring or connectors, or replace the glow plug control module if necessary.

6. Are there any preventive measures to avoid the Cylinder 3 Glow Plug Circuit Fault in a 2014 GMC Sierra?

Regular maintenance checks, such as inspecting and testing the glow plugs, wiring, and connectors, can help prevent issues with the glow plug circuit and potentially avoid triggering OBDII code P0673.

7. How much does it typically cost to repair the Cylinder 3 Glow Plug Circuit Fault in a 2014 GMC Sierra with OBDII code P0673?

The cost of repair can vary depending on the extent of the issue and whether you choose to do the repairs yourself or take the vehicle to a mechanic. Costs may include parts and labor.

8. Can a faulty glow plug in cylinder 3 cause other problems in a 2014 GMC Sierra besides triggering OBDII code P0673?

Yes, a faulty glow plug in cylinder 3 can lead to incomplete combustion, reduced fuel efficiency, increased emissions, and potential damage to the engine over time if left unrepaired.

Discuss the causes and fixes for P0673 2014 GMC Sierra OBDII Code

Submit a New Comment

Code P0673 2014 GMC Sierra comments

No comments found for this page.