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Engine-Codes – GMC – P068E 2016 GMC Sierra

P068E 2016 GMC Sierra Code - Cylinder 8 Glow Plug Control Circuit Low Voltage

Quick Answer

The P068E diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the Cylinder 8 Glow Plug Control Circuit experiencing low voltage. Common causes include Faulty glow plug in Cylinder 8, Wiring or connection issues 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 2016 GMC Sierra indicates Cylinder 8 Glow Plug Control Circuit Low Voltage.
Common causes
Common causes include Faulty glow plug in Cylinder 8, Wiring or connection issues 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 13, 2024
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Code P068E 2016 GMC Sierra Description

The P068E diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the Cylinder 8 Glow Plug Control Circuit experiencing low voltage. Glow plugs are essential components in diesel engines, as they heat the combustion chamber to facilitate cold starts. When the glow plug control circuit in Cylinder 8 is not receiving sufficient voltage, it can lead to difficulties in starting the engine, reduced performance, and potential long-term damage if left unaddressed.

OBDII Code P068E 2016 GMC Sierra - Cylinder 8 Glow Plug Control Circuit Low Voltage
P068E 2016 GMC Sierra Code - Cylinder 8 Glow Plug Control Circuit Low Voltage

Common Causes of P068E 2016 GMC Sierra

  1. Faulty glow plug in Cylinder 8.
  2. Wiring or connection issues in the glow plug control circuit.
  3. Malfunctioning glow plug control module.
  4. Corrosion or damage to electrical components in the circuit.
  5. Issues with the engine's temperature sensors affecting glow plug operation.

Symptoms of P068E 2016 GMC Sierra

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring upon startup.
  3. Decreased fuel efficiency.
  4. Illumination of the Check Engine Light.
  5. Increased emissions output.

How to Fix P068E 2016 GMC Sierra

  1. Begin by diagnosing the specific cause of the low voltage condition in the Cylinder 8 glow plug control circuit using a diagnostic scanner.
  2. Inspect the glow plug in Cylinder 8 for proper operation and replace if necessary.
  3. Check the wiring and connections in the glow plug control circuit for any damage or corrosion, repairing or replacing as needed.
  4. Test the glow plug control module for functionality and replace if it is found to be faulty.
  5. Clear the DTC from the vehicle's computer system and test the vehicle to ensure that the issue has been resolved.

Cost to Fix P068E 2016 GMC Sierra

The typical repair costs for addressing a Cylinder 8 Glow Plug Control Circuit Low Voltage issue in a 2016 GMC Sierra can vary depending on the specific cause of the problem. Generally, replacing a glow plug can cost between $50 and $150 per plug, while a glow plug control module replacement may range from $150 to $300. Labor costs at auto repair shops can add an additional $80 to $150 per hour, with the total repair bill potentially ranging from $200 to $600 or more. It's advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's specific needs and location.

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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 2016 GMC Sierra Code

1. What does OBDII code P068E mean on a 2016 GMC Sierra?

Code P068E indicates a problem with the Cylinder 8 Glow Plug Control Circuit, specifically a low voltage condition.

2. What are the common symptoms of code P068E in a 2016 GMC Sierra?

Symptoms may include hard starting in cold weather, reduced engine performance, a rough idle, and an illuminated check engine light.

3. What causes code P068E on a 2016 GMC Sierra?

Common causes include a faulty glow plug for cylinder 8, damaged wiring or connectors in the glow plug circuit, corrosion, or a malfunctioning glow plug control module.

4. How can I diagnose code P068E on my 2016 GMC Sierra?

Start by inspecting the glow plug for cylinder 8 and its wiring for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit.

5. Can I drive my 2016 GMC Sierra with code P068E?

While it might still be drivable, it’s not recommended to ignore this code as it can lead to harder starts and increased wear on the engine, especially in cold weather.

6. How do I fix code P068E on a 2016 GMC Sierra?

Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the glow plug control module if needed.

7. How much does it cost to fix code P068E on a 2016 GMC Sierra?

The repair cost depends on the issue, but replacing a glow plug typically costs $100-$300, including parts and labor. Wiring or control module repairs could cost more.

8. Can a weak battery cause code P068E on a 2016 GMC Sierra?

Yes, a weak or failing battery can contribute to low voltage in the glow plug circuit and may trigger this code.

9. How do I prevent code P068E from recurring on my 2016 GMC Sierra?

Regular maintenance, including checking the glow plug system, inspecting wiring for damage, and ensuring the battery is in good condition, can help prevent this code.

10. Does code P068E affect fuel efficiency on a 2016 GMC Sierra?

It can indirectly affect fuel efficiency if the engine struggles to start or runs inefficiently due to the malfunctioning glow plug system.

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