Engine-Codes.com
Engine-Codes – Chevrolet – P0678 2017 Chevrolet Silverado

P0678 2017 Chevrolet Silverado Code - Cylinder 8 Glow Plug Circuit Fault

Quick Answer

The diagnostic trouble code P0678 on a 2017 Chevrolet Silverado indicates a fault in the cylinder 8 glow plug circuit. Common causes include A faulty glow plug in cylinder 8, Damaged or corroded wiring or connectors related to 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
P0678 2017 Chevrolet Silverado indicates Cylinder 8 Glow Plug Circuit Fault.
Common causes
Common causes include A faulty glow plug in cylinder 8, Damaged or corroded wiring or connectors related to 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 08, 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 P0678 2017 Chevrolet Silverado Description

The diagnostic trouble code P0678 on a 2017 Chevrolet Silverado indicates a fault in the cylinder 8 glow plug circuit. Glow plugs are essential components in diesel engines, as they heat up the combustion chamber during cold starts to aid in the ignition process. When the engine is cold, the glow plugs heat up to ensure proper starting and combustion. In the case of a cylinder 8 glow plug circuit fault, it means that there is an issue with the electrical circuit that controls the glow plug in cylinder 8.

OBDII Code P0678 2017 Chevrolet Silverado - Cylinder 8 Glow Plug Circuit Fault
P0678 2017 Chevrolet Silverado Code - Cylinder 8 Glow Plug Circuit Fault

Common Causes of P0678 2017 Chevrolet Silverado

  1. A faulty glow plug in cylinder 8
  2. Damaged or corroded wiring or connectors related to the glow plug circuit
  3. Malfunctioning glow plug control module
  4. Issues with the engine's computer system or sensors
  5. Electrical issues such as short circuits or blown fuses

Symptoms of P0678 2017 Chevrolet Silverado

  1. Hard starting, especially in cold weather conditions
  2. Rough idling or engine misfires
  3. Decreased fuel efficiency
  4. Engine performance issues
  5. Illumination of the check engine light

How to Fix P0678 2017 Chevrolet Silverado

  1. Begin by diagnosing the specific cause of the cylinder 8 glow plug circuit fault using a diagnostic scanner to pinpoint the exact issue.
  2. Inspect the glow plug in cylinder 8 to determine if it is faulty and needs replacement.
  3. Check the wiring and connectors associated with the glow plug circuit for any damage or corrosion, repairing or replacing them as needed.
  4. Test the glow plug control module to ensure it is functioning correctly, replacing it if necessary.
  5. Clear the error code from the vehicle's computer system after completing the repairs and test the vehicle to ensure the issue has been resolved.

Cost to Fix P0678 2017 Chevrolet Silverado

The typical repair costs for addressing a cylinder 8 glow plug circuit fault can range from $150 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It's advisable to inquire about local rates to obtain a more accurate estimate for this repair. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more affordable pricing.

Need more information about the P0678 2017 Chevrolet Silverado code?

Need more information on how to fix the P0678 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0678 2017 Chevrolet Silverado 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 P0678 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0678 in a 2017 Chevrolet Silverado related to the Cylinder 8 Glow Plug Circuit Fault?

- Common symptoms include rough idling, difficulty starting the engine, decreased fuel efficiency, and potential misfires.

2. What are the possible causes of OBDII code P0678 in a 2017 Chevrolet Silverado indicating a Cylinder 8 Glow Plug Circuit Fault?

- The code may be triggered by a faulty glow plug, damaged wiring in the glow plug circuit, a defective glow plug control module, or issues with the vehicle's ECM.

3. How can I diagnose the Cylinder 8 Glow Plug Circuit Fault in a 2017 Chevrolet Silverado with OBDII code P0678?

- Use a multimeter to test the glow plug resistance, inspect the wiring for any visible damage, check the glow plug control module for proper functionality, and scan the vehicle for additional trouble codes.

4. Can I continue to drive my 2017 Chevrolet Silverado with OBDII code P0678 pointing to a Cylinder 8 Glow Plug Circuit Fault?

- It is not recommended to drive the vehicle extensively with this fault as it can lead to further engine issues and potential damage. It's best to address the problem promptly.

5. What are the repair options for fixing OBDII code P0678 in a 2017 Chevrolet Silverado associated with a Cylinder 8 Glow Plug Circuit Fault?

- Repair options include replacing the faulty glow plug, repairing damaged wiring, replacing the glow plug control module if needed, or resetting the ECM after fixing the issue.

6. Is it possible to reset the OBDII code P0678 in a 2017 Chevrolet Silverado after repairing the Cylinder 8 Glow Plug Circuit Fault?

- Yes, once the underlying issue causing the fault code has been resolved, you can use an OBDII scanner to clear the code and reset the vehicle's ECM.

7. How critical is it to address OBDII code P0678 related to a Cylinder 8 Glow Plug Circuit Fault in a 2017 Chevrolet Silverado promptly?

- It's important to address the issue promptly to avoid potential engine performance problems, reduced fuel efficiency, and prevent further damage to the vehicle.

8. Are there any preventive maintenance steps I can take to avoid encountering OBDII code P0678 in my 2017 Chevrolet Silverado?

- Regularly inspecting and testing the glow plugs, monitoring the glow plug circuit for any issues, and following the manufacturer's recommended maintenance schedule can help prevent this fault.

9. Can a DIY enthusiast with basic automotive skills repair OBDII code P0678 in a 2017 Chevrolet Silverado related to a Cylinder 8 Glow Plug Circuit Fault?

- Depending on the exact cause of the fault, some repairs like replacing a glow plug or checking wiring connections can be done by someone with basic automotive skills. However, complex issues may require professional help.

10. What are the potential risks of ignoring OBDII code P0678 in a 2017 Chevrolet Silverado signaling a Cylinder 8 Glow Plug Circuit Fault?

- Ignoring the fault code can lead to poor engine performance, reduced fuel efficiency, potential engine misfires, and in severe cases, damage to the engine components.

Discuss the causes and fixes for P0678 2017 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P0678 2017 Chevrolet Silverado comments

No comments found for this page.