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P068F 2016 Chevrolet Silverado Code - Cylinder 8 Glow Plug Control Circuit High Voltage

Quick Answer

The P068F diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a high voltage condition in the glow plug control circuit for Cylinder 8 in a 2016 Chevrolet Silverado. Common causes include Faulty glow plug for Cylinder 8, Damaged or corroded wiring in the glow plug control circuit, Defective glow plug relay or 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
P068F 2016 Chevrolet Silverado indicates Cylinder 8 Glow Plug Control Circuit High Voltage.
Common causes
Common causes include Faulty glow plug for Cylinder 8, Damaged or corroded wiring in the glow plug control circuit, Defective glow plug relay or 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 Oct 17, 2024
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Code P068F 2016 Chevrolet Silverado Description

The P068F diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a high voltage condition in the glow plug control circuit for Cylinder 8 in a 2016 Chevrolet Silverado. Glow plugs are essential components in diesel engines, designed to preheat the combustion chamber for easier ignition of the fuel-air mixture, particularly in cold weather conditions. When the ECM identifies a high voltage in the control circuit, it suggests that the voltage exceeds the expected range, which can lead to improper glow plug operation.

OBDII Code P068F 2016 Chevrolet Silverado - Cylinder 8 Glow Plug Control Circuit High Voltage
P068F 2016 Chevrolet Silverado Code - Cylinder 8 Glow Plug Control Circuit High Voltage

Common Causes of P068F 2016 Chevrolet Silverado

  1. Faulty glow plug for Cylinder 8.
  2. Damaged or corroded wiring in the glow plug control circuit.
  3. Defective glow plug relay or control module.
  4. Malfunctioning Engine Control Module (ECM).
  5. Poor electrical connections or grounding issues in the circuit.

Symptoms of P068F 2016 Chevrolet Silverado

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring of the engine.
  3. Increased exhaust smoke, particularly during startup.
  4. Decreased fuel efficiency and overall engine performance.
  5. Activation of the check engine light on the dashboard.

How to Fix P068F 2016 Chevrolet Silverado

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the P068F code and check for any additional codes that may provide more context.
  2. Visual Inspection: Inspect the glow plug for Cylinder 8 and the associated wiring and connectors for any signs of damage, corrosion, or loose connections.
  3. Test the Glow Plug: Use a multimeter to test the resistance of the glow plug. If it is outside the specified range, replace the glow plug.
  4. Check the Control Circuit: Examine the glow plug relay and the wiring harness for continuity and proper voltage. Repair or replace any damaged components.
  5. ECM Reprogramming or Replacement: If the glow plug and circuit are functioning correctly but the code persists, consider reprogramming or replacing the ECM.

Cost to Fix P068F 2016 Chevrolet Silverado

Repair costs for addressing the P068F code can vary widely based on the specific issue identified during diagnosis. On average, the cost for parts and labor can range from $200 to $800. This estimate includes the price of a new glow plug (approximately $50 to $150), potential wiring repairs, and labor costs, which typically range from $80 to $150 per hour. The total labor time may vary depending on the complexity of the repair, with most shops estimating 1 to 3 hours for diagnosis and repair. It is important to note that labor rates can differ significantly based on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer more competitive pricing. Always check local rates for a more precise 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 P068F 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P068F in a 2016 Chevrolet Silverado related to the Cylinder 8 Glow Plug Control Circuit High Voltage?

- The common symptoms include rough idling, misfires, decreased fuel efficiency, and possibly the illumination of the check engine light.

2. What are the potential causes of the Cylinder 8 Glow Plug Control Circuit High Voltage issue in a 2016 Chevrolet Silverado?

- 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 engine control module.

3. How can I diagnose the Cylinder 8 Glow Plug Control Circuit High Voltage problem in my 2016 Chevrolet Silverado?

- Diagnosis involves using an OBDII scanner to retrieve the specific fault code (P068F), inspecting the glow plug and its circuit for damage, and testing the related components for proper functionality.

4. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P068F related to Cylinder 8 Glow Plug Control Circuit High Voltage?

- It is not recommended to drive the vehicle with this issue as it can lead to performance problems and potential damage to the engine over time. It's best to address the problem promptly.

5. How can I repair the Cylinder 8 Glow Plug Control Circuit High Voltage issue in my 2016 Chevrolet Silverado?

- The repair process may involve replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, and potentially replacing the glow plug control module or addressing issues with the engine control module.

6. Are there any DIY tips for fixing OBDII code P068F in a 2016 Chevrolet Silverado on my own?

- While some basic troubleshooting like checking for loose connections or damaged wiring can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for a thorough diagnosis and repair of this issue.

7. How much does it typically cost to repair the Cylinder 8 Glow Plug Control Circuit High Voltage problem in a 2016 Chevrolet Silverado?

- The cost of repairs can vary depending on the specific cause of the issue, but typically, it may range from $200 to $500 or more, including parts and labor.

8. Can a faulty glow plug cause other issues besides triggering OBDII code P068F in a 2016 Chevrolet Silverado?

- Yes, a faulty glow plug can lead to cold-starting problems, decreased engine performance, increased emissions, and potential damage to other engine components if not addressed promptly.

9. Is it possible for the Cylinder 8 Glow Plug Control Circuit High Voltage problem to recur after repairs in a 2016 Chevrolet Silverado?

- While proper repairs should resolve the issue, there is always a possibility of recurrence if the underlying cause was not fully addressed or if other related components develop faults in the future.

10. How long does it typically take for a mechanic to repair OBDII code P068F related to Cylinder 8 Glow Plug Control Circuit High Voltage in a 2016 Chevrolet Silverado?

- The repair time can vary based on the specific diagnosis and parts availability, but it usually takes a few hours to a full day to complete the necessary repairs and testing.

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