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P068D 2018 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit High Voltage

Quick Answer

The P068D diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the cylinder 7 glow plug control circuit having high voltage. Common causes include Faulty glow plug in cylinder 7, Damaged wiring in the glow plug control 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
P068D 2018 Chevrolet Silverado indicates Cylinder 7 Glow Plug Control Circuit High Voltage.
Common causes
Common causes include Faulty glow plug in cylinder 7, Damaged wiring in the glow plug control 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 18, 2024
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Code P068D 2018 Chevrolet Silverado Description

The P068D diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the cylinder 7 glow plug control circuit having high voltage. Glow plugs are essential components in diesel engines, as they help heat the combustion chamber for easier cold starts. When the engine control module (ECM) detects that the voltage in the cylinder 7 glow plug control circuit is higher than normal, it triggers this code. This issue can lead to difficulties starting the engine, reduced fuel efficiency, and potential damage to the engine over time.

OBDII Code P068D 2018 Chevrolet Silverado - Cylinder 7 Glow Plug Control Circuit High Voltage
P068D 2018 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit High Voltage

Common Causes of P068D 2018 Chevrolet Silverado

  1. Faulty glow plug in cylinder 7.
  2. Damaged wiring in the glow plug control circuit.
  3. Malfunctioning glow plug control module.
  4. ECM issues causing incorrect voltage readings.
  5. Corrosion or loose connections in the glow plug circuit.

Symptoms of P068D 2018 Chevrolet Silverado

  1. Difficulty starting the engine, especially in cold weather.
  2. Reduced fuel efficiency due to incomplete combustion.
  3. Rough idling or misfiring of the engine.
  4. Illumination of the check engine light on the dashboard.
  5. Increased emissions due to incomplete combustion.

How to Fix P068D 2018 Chevrolet Silverado

  1. Begin by diagnosing the specific cause of the high voltage in the cylinder 7 glow plug control circuit using a scan tool to read the DTC.
  2. Inspect the glow plug in cylinder 7 for any signs of damage or malfunction. Replace if necessary.
  3. Check the wiring in the glow plug control circuit for any damage, corrosion, or loose connections. Repair or replace as needed.
  4. Test the glow plug control module to ensure it is functioning correctly. Replace if found to be faulty.
  5. Clear the DTC from the ECM memory and test the vehicle to ensure the issue has been resolved.

Cost to Fix P068D 2018 Chevrolet Silverado

The typical repair costs for addressing a P068D code in a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. Generally, replacing a glow plug can cost between $50 and $150 per plug, while replacing a glow plug control module can range from $200 to $500. Labor costs can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It's advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your location and vehicle specifics.

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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 P068D 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P068D in a 2018 Chevrolet Silverado related to the Cylinder 7 Glow Plug Control Circuit High Voltage issue?

- Common symptoms may include rough idling, engine misfires, decreased fuel efficiency, and the illumination of the check engine light.

2. What could be the possible causes of OBDII code P068D in a 2018 Chevrolet Silverado?

- The code P068D can be triggered by issues such as a faulty glow plug, damaged wiring in the glow plug circuit, or problems with the glow plug controller.

3. How can I diagnose the Cylinder 7 Glow Plug Control Circuit High Voltage issue in my 2018 Chevrolet Silverado?

- A diagnostic scan tool can be used to read the OBDII code P068D. Further troubleshooting may involve checking the glow plug, inspecting the wiring for damage, and testing the glow plug control module.

4. Can driving with OBDII code P068D in my 2018 Chevrolet Silverado cause further damage to the vehicle?

- Continuing to drive with the Cylinder 7 Glow Plug Control Circuit High Voltage issue may lead to increased emissions, reduced engine performance, and potential damage to other engine components over time.

5. Is it safe to continue driving my 2018 Chevrolet Silverado with the check engine light on due to code P068D?

- It is not recommended to drive the vehicle with the check engine light illuminated, as the underlying issue causing the code P068D could affect the vehicle's performance and emissions.

6. How can I repair the Cylinder 7 Glow Plug Control Circuit High Voltage problem in my 2018 Chevrolet Silverado?

- Repairing the issue may involve replacing the faulty glow plug, repairing or replacing damaged wiring, or replacing the glow plug control module as needed.

7. Are there any DIY tips for addressing OBDII code P068D in a 2018 Chevrolet Silverado?

- While some basic troubleshooting like checking for loose connections or damaged wiring can be done by DIY enthusiasts, diagnosing and repairing the specific cause of the issue may require professional assistance.

8. How much does it typically cost to fix the Cylinder 7 Glow Plug Control Circuit High Voltage problem in a 2018 Chevrolet Silverado?

- The cost of repairs for OBDII code P068D can vary depending on the exact cause of the issue, but it may range from a few hundred to a thousand dollars, including parts and labor.

9. Can resetting the OBDII code P068D in my 2018 Chevrolet Silverado make the issue go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the Cylinder 7 Glow Plug Control Circuit High Voltage problem is not addressed, the code is likely to reappear.

10. How often should I have my 2018 Chevrolet Silverado's glow plug system inspected to prevent OBDII code P068D from occurring?

- Regular maintenance checks, especially before the cold season, can help identify any potential issues with the glow plug system and prevent the occurrence of code P068D in your Chevrolet Silverado.

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