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Engine-Codes – GMC – P068E 2017 GMC Sierra

P068E 2017 GMC Sierra Code - Cylinder 8 Glow Plug Control Circuit Low Voltage

Quick Answer

When the diagnostic trouble code P068E appears on a 2017 GMC Sierra, it indicates an issue with the cylinder 8 glow plug control circuit experiencing low voltage. Common causes include Faulty glow plug in cylinder 8, Wiring issues or loose connections 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
P068E 2017 GMC Sierra indicates Cylinder 8 Glow Plug Control Circuit Low Voltage.
Common causes
Common causes include Faulty glow plug in cylinder 8, Wiring issues or loose connections 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 Aug 19, 2024
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Code P068E 2017 GMC Sierra Description

When the diagnostic trouble code P068E appears on a 2017 GMC Sierra, it indicates an issue with the cylinder 8 glow plug control circuit experiencing low voltage. Glow plugs are essential components in diesel engines that help with cold starts by heating up the combustion chamber. In this case, a low voltage in the control circuit of the glow plug for cylinder 8 can lead to difficulties starting the engine, especially in cold weather conditions. This can result in poor engine performance, decreased fuel efficiency, and potential damage to the engine over time if not addressed promptly.

OBDII Code P068E 2017 GMC Sierra - Cylinder 8 Glow Plug Control Circuit Low Voltage
P068E 2017 GMC Sierra Code - Cylinder 8 Glow Plug Control Circuit Low Voltage

Common Causes of P068E 2017 GMC Sierra

  1. Faulty glow plug in cylinder 8
  2. Wiring issues or loose connections in the glow plug control circuit
  3. Malfunctioning glow plug control module
  4. Corrosion or damage to electrical connectors
  5. Issues with the vehicle's battery or alternator affecting voltage supply

Symptoms of P068E 2017 GMC Sierra

  1. Hard starting or extended cranking time
  2. Rough idling or misfires
  3. Decreased engine power and acceleration
  4. Increased fuel consumption
  5. Illumination of the check engine light

How to Fix P068E 2017 GMC Sierra

  1. Begin by conducting a visual inspection of the glow plug and its wiring to check for any obvious signs of damage or corrosion.
  2. Test the glow plug using a multimeter to determine if it is functioning correctly.
  3. Inspect the wiring and connectors for any breaks, loose connections, or corrosion, repairing or replacing them as needed.
  4. Test the glow plug control module to ensure it is sending the correct voltage signals to the glow plug.
  5. Clear the diagnostic trouble code from the vehicle's computer after completing the repairs and test the vehicle to ensure the issue has been resolved.

Cost to Fix P068E 2017 GMC Sierra

The cost of repairing a cylinder 8 glow plug control circuit low voltage issue on a 2017 GMC Sierra can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts required for this repair, such as a glow plug or wiring harness, can range from $50 to $150. Labor costs can add an additional $100 to $300, depending on the complexity of the repair and the shop's hourly rates. Therefore, the total cost for addressing this code could range from $150 to $450. It's advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's specific needs.

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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 P068E 2017 GMC Sierra Code

1. What are common symptoms of an OBDII code P068E in a 2017 GMC Sierra related to the Cylinder 8 Glow Plug Control Circuit?

- Common symptoms include rough idling, reduced engine performance, and the illumination of the check engine light.

2. What are the potential causes of the Cylinder 8 Glow Plug Control Circuit Low Voltage issue in a 2017 GMC Sierra?

- Possible causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or issues with the vehicle's ECM.

3. How can I diagnose the Cylinder 8 Glow Plug Control Circuit Low Voltage problem in my 2017 GMC Sierra?

- Use a diagnostic scanner to retrieve the OBDII code P068E, visually inspect the glow plug and its connections, test the glow plug control module, and check for any wiring issues.

4. Can I continue driving my 2017 GMC Sierra with the P068E OBDII code related to the Cylinder 8 Glow Plug Control Circuit?

- It is not recommended to drive the vehicle with this issue, as it can lead to poor engine performance and potential damage if left unresolved.

5. What is the typical repair process for fixing the Cylinder 8 Glow Plug Control Circuit Low Voltage problem in a 2017 GMC Sierra?

- The repair process usually involves replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, and possibly replacing the glow plug control module if necessary.

6. Are there any DIY tips for addressing the P068E OBDII code in a 2017 GMC Sierra?

- DIY enthusiasts with automotive repair experience can attempt to inspect and replace the glow plug themselves, but diagnosing wiring or control module issues may require professional help.

7. How much does it cost to repair the Cylinder 8 Glow Plug Control Circuit Low Voltage issue in a 2017 GMC Sierra?

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

8. Can extreme weather conditions affect the Cylinder 8 Glow Plug Control Circuit in a 2017 GMC Sierra?

- Yes, extreme cold weather can put additional strain on the glow plug system, potentially leading to issues like the low voltage condition indicated by the P068E code.

9. Will disconnecting the battery reset the P068E OBDII code in a 2017 GMC Sierra?

- Disconnecting the battery may temporarily clear the code, but it is not a proper fix for the underlying issue causing the Cylinder 8 Glow Plug Control Circuit Low Voltage problem.

10. Is the Cylinder 8 Glow Plug Control Circuit Low Voltage issue a common problem in 2017 GMC Sierra vehicles?

- While not extremely common, issues with glow plugs and control circuits can occur in diesel vehicles like the 2017 GMC Sierra, especially with age or high mileage.

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