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Engine-Codes – GMC – P068C 2015 GMC Sierra

P068C 2015 GMC Sierra Code - Cylinder 7 Glow Plug Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code P068C for a 2015 GMC Sierra indicates an issue with the Cylinder 7 Glow Plug Control Circuit having low voltage. Common causes include Faulty glow plugs, Malfunctioning glow plug control module, Wiring or connection issues. 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
P068C 2015 GMC Sierra indicates Cylinder 7 Glow Plug Control Circuit Low Voltage.
Common causes
Common causes include Faulty glow plugs, Malfunctioning glow plug control module, Wiring or connection issues.
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 10, 2024
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Code P068C 2015 GMC Sierra Description

The diagnostic trouble code P068C for a 2015 GMC Sierra indicates an issue with the Cylinder 7 Glow Plug Control Circuit having low voltage. Glow plugs are essential components in diesel engines that help with cold starts by heating up the combustion chamber. In this case, Cylinder 7 refers to a specific cylinder in the engine where the glow plug control circuit is experiencing low voltage.

OBDII Code P068C 2015 GMC Sierra - Cylinder 7 Glow Plug Control Circuit Low Voltage
P068C 2015 GMC Sierra Code - Cylinder 7 Glow Plug Control Circuit Low Voltage

Common Causes of P068C 2015 GMC Sierra

  1. Faulty glow plugs
  2. Malfunctioning glow plug control module
  3. Wiring or connection issues
  4. Faulty engine control module (ECM)
  5. Corrosion or damage to electrical components

Symptoms of P068C 2015 GMC Sierra

  1. Difficulty starting the engine, especially in cold weather
  2. Rough idling or engine misfires
  3. Reduced fuel efficiency
  4. Increased emissions
  5. Illumination of the check engine light

How to Fix P068C 2015 GMC Sierra

  1. Diagnose the specific cause by conducting a thorough inspection of the glow plugs, control module, wiring, and ECM.
  2. Test the glow plugs and control module for proper functionality using a multimeter or diagnostic tool.
  3. Replace any faulty glow plugs, control module, or damaged wiring as needed.
  4. Clear the diagnostic trouble codes from the vehicle's ECM and test the system to ensure proper operation.
  5. If necessary, reprogram or replace the ECM to address any underlying issues with the control circuit.

Cost to Fix P068C 2015 GMC Sierra

The cost of repairing a Cylinder 7 Glow Plug Control Circuit Low Voltage issue can vary depending on the exact cause of the problem and the specific components that need to be replaced. On average, the parts for this repair can range from $100 to $300, while labor costs can range from $150 to $400. Overall, the total repair cost could fall between $250 and $700. It is recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to inquire about rates in your area for a more precise cost 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 P068C 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P068C in a 2015 GMC Sierra related to Cylinder 7 Glow Plug Control Circuit Low Voltage?

The common symptoms include rough idling, loss of engine power, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P068C in a 2015 GMC Sierra indicating an issue with the Cylinder 7 Glow Plug Control Circuit?

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

3. How can I diagnose the Cylinder 7 Glow Plug Control Circuit Low Voltage issue in my 2015 GMC Sierra triggering OBDII code P068C?

Diagnosis involves checking the glow plug resistance, inspecting the wiring and connectors for any damage, testing the glow plug control module, and scanning the ECM for any related fault codes.

4. Can I still drive my 2015 GMC Sierra with OBDII code P068C related to Cylinder 7 Glow Plug Control Circuit Low Voltage?

While it may be possible to drive the vehicle with this code, it is not recommended as it can lead to further engine damage and decreased performance. It is best to address the issue promptly.

5. How can I reset the Check Engine Light after repairing the Cylinder 7 Glow Plug Control Circuit Low Voltage problem in my 2015 GMC Sierra?

You can reset the Check Engine Light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, the light will only stay off if the underlying issue has been successfully resolved.

6. Is it necessary to replace all glow plugs when addressing OBDII code P068C in my 2015 GMC Sierra?

While it is not always necessary to replace all glow plugs, it is recommended to inspect all of them during the diagnostic process to ensure they are functioning properly. Replacing only the faulty ones may be sufficient.

7. Can a DIY enthusiast repair the Cylinder 7 Glow Plug Control Circuit Low Voltage issue causing OBDII code P068C in a 2015 GMC Sierra?

DIY enthusiasts with experience in automotive repair and the necessary tools may be able to address this issue themselves. However, it is advisable to consult a professional mechanic for accurate diagnosis and repair if unsure.

8. How much does it typically cost to repair OBDII code P068C related to Cylinder 7 Glow Plug Control Circuit Low Voltage in a 2015 GMC Sierra?

The cost of repair can vary depending on the underlying cause of the issue, the extent of the damage, and the labor rates in your area. It is recommended to obtain quotes from different mechanics for an accurate estimate.

9. Will ignoring OBDII code P068C in my 2015 GMC Sierra lead to further engine problems?

Ignoring this code can lead to more severe issues such as poor engine performance, increased emissions, and potential damage to other engine components. It is best to address the problem as soon as possible to prevent further damage.

10. Can extreme weather conditions affect the Cylinder 7 Glow Plug Control Circuit and trigger OBDII code P068C in a 2015 GMC Sierra?

Extreme cold weather can put additional strain on the glow plug system, potentially leading to issues with the glow plug control circuit. Ensuring the glow plug system is in good condition can help prevent problems in harsh weather conditions.

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