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P0674 2015 Chevrolet Silverado Code - Cylinder 4 Glow Plug Circuit Fault

Quick Answer

The P0674 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a fault in the glow plug circuit of cylinder 4. Common causes include Faulty glow plug in cylinder 4, Wiring or connection issues in the glow plug circuit, Corrosion or damage to the glow plug circuit components. 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
P0674 2015 Chevrolet Silverado indicates Cylinder 4 Glow Plug Circuit Fault.
Common causes
Common causes include Faulty glow plug in cylinder 4, Wiring or connection issues in the glow plug circuit, Corrosion or damage to the glow plug circuit components.
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 14, 2024
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Code P0674 2015 Chevrolet Silverado Description

The P0674 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a fault in the glow plug circuit of cylinder 4. Glow plugs are essential components in diesel engines that help with cold starts by preheating the combustion chamber. When the engine is cold, the glow plugs heat up to ensure proper ignition of the fuel-air mixture.

OBDII Code P0674 2015 Chevrolet Silverado - Cylinder 4 Glow Plug Circuit Fault
P0674 2015 Chevrolet Silverado Code - Cylinder 4 Glow Plug Circuit Fault

Common Causes of P0674 2015 Chevrolet Silverado

  1. Faulty glow plug in cylinder 4.
  2. Wiring or connection issues in the glow plug circuit.
  3. Corrosion or damage to the glow plug circuit components.
  4. Issues with the engine control module (ECM) or glow plug relay.
  5. Environmental factors such as extreme cold affecting the glow plug's performance.

Symptoms of P0674 2015 Chevrolet Silverado

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring.
  3. Decreased fuel efficiency.
  4. Engine performance issues, such as lack of power.
  5. Check Engine Light illuminated on the dashboard.

How to Fix P0674 2015 Chevrolet Silverado

  1. Begin by diagnosing the specific cause of the fault using a diagnostic scanner to pinpoint the issue.
  2. Inspect the glow plug in cylinder 4 to determine if it is faulty and needs replacement.
  3. Check the wiring and connections in the glow plug circuit for any damage or corrosion. Repair or replace as necessary.
  4. Test the glow plug relay and ECM to ensure they are functioning correctly.
  5. Clear the DTC from the vehicle's memory and test the vehicle to confirm that the issue has been resolved.

Cost to Fix P0674 2015 Chevrolet Silverado

The typical repair costs for a cylinder 4 glow plug circuit fault can vary depending on the specific cause of the issue. In general, the cost of replacing a glow plug can range from $50 to $150 per plug, with labor costs adding an additional $100 to $200. If wiring or other components need to be replaced, the total repair cost could be between $200 and $500. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate.

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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 P0674 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0674 on a 2015 Chevrolet Silverado related to the Cylinder 4 Glow Plug Circuit Fault?

The common symptoms include rough engine idling, difficulty starting the vehicle, reduced engine performance, and potentially increased fuel consumption.

2. What are the possible causes of the Cylinder 4 Glow Plug Circuit Fault in a 2015 Chevrolet Silverado triggering OBDII code P0674?

Potential causes include a faulty glow plug in cylinder 4, damaged wiring or connectors in the glow plug circuit, a defective glow plug control module, or issues with the vehicle's PCM (powertrain control module).

3. How can I diagnose the Cylinder 4 Glow Plug Circuit Fault causing OBDII code P0674 in my 2015 Chevrolet Silverado?

To diagnose the issue, you can use a diagnostic scanner to retrieve the specific trouble code, visually inspect the glow plug and its wiring for damage, test the glow plug for continuity, and check the glow plug control module for proper operation.

4. Is it safe to continue driving my 2015 Chevrolet Silverado with OBDII code P0674 related to the Cylinder 4 Glow Plug Circuit Fault?

It is not recommended to drive the vehicle with this fault, as it can lead to poor engine performance, potential damage to other engine components, and even engine misfires. It's best to address the issue promptly.

5. Can I repair the Cylinder 4 Glow Plug Circuit Fault triggering OBDII code P0674 in my 2015 Chevrolet Silverado myself?

Depending on your mechanical skills and tools, you may be able to replace the faulty glow plug or repair damaged wiring yourself. However, diagnosing and fixing issues with the glow plug control module or PCM may require professional help.

6. How much does it typically cost to repair the Cylinder 4 Glow Plug Circuit Fault causing OBDII code P0674 in a 2015 Chevrolet Silverado?

The cost of repair can vary widely depending on the exact cause of the fault, labor rates in your area, and whether you choose to use OEM or aftermarket parts. Repairs for glow plug issues can range from $100 to $500 or more.

7. Are there any preventive maintenance tips to avoid encountering OBDII code P0674 related to the Cylinder 4 Glow Plug Circuit Fault in my 2015 Chevrolet Silverado?

To prevent glow plug circuit faults, it's advisable to follow the manufacturer's recommended maintenance schedule, avoid using poor quality fuel, and address any engine performance issues promptly to prevent excessive strain on the glow plug system.

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