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P068F 2014 Chevrolet Silverado Code - Cylinder 8 Glow Plug Control Circuit High Voltage

Quick Answer

The P068F diagnostic trouble code (DTC) indicates a high voltage condition in the glow plug control circuit for cylinder 8 in a 2014 Chevrolet Silverado. Common causes include Faulty glow plug for cylinder 8, which may be shorted or damaged, Malfunctioning glow plug relay that is supplying excessive voltage, Wiring issues, such as frayed or damaged wires in the glow plug circuit. 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 2014 Chevrolet Silverado indicates Cylinder 8 Glow Plug Control Circuit High Voltage.
Common causes
Common causes include Faulty glow plug for cylinder 8, which may be shorted or damaged, Malfunctioning glow plug relay that is supplying excessive voltage, Wiring issues, such as frayed or damaged wires in the glow plug circuit.
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 21, 2024
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Code P068F 2014 Chevrolet Silverado Description

The P068F diagnostic trouble code (DTC) indicates a high voltage condition in the glow plug control circuit for cylinder 8 in a 2014 Chevrolet Silverado. This code is primarily associated with diesel engines, where glow plugs are critical for starting the engine, especially in cold conditions. The glow plugs heat the air in the combustion chamber to facilitate ignition. A high voltage reading in the control circuit suggests that the electrical system is supplying more voltage than the glow plug is designed to handle, which can lead to premature failure of the glow plug and may affect the overall performance of the engine.

OBDII Code P068F 2014 Chevrolet Silverado - Cylinder 8 Glow Plug Control Circuit High Voltage
P068F 2014 Chevrolet Silverado Code - Cylinder 8 Glow Plug Control Circuit High Voltage

Common Causes of P068F 2014 Chevrolet Silverado

  1. Faulty glow plug for cylinder 8, which may be shorted or damaged.
  2. Malfunctioning glow plug relay that is supplying excessive voltage.
  3. Wiring issues, such as frayed or damaged wires in the glow plug circuit.
  4. Problems with the engine control module (ECM) that may lead to incorrect voltage readings.
  5. Corrosion or poor connections in the electrical connectors associated with the glow plug circuit.

Symptoms of P068F 2014 Chevrolet Silverado

  1. Hard starting, especially in cold weather conditions.
  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 2014 Chevrolet Silverado

  1. Diagnostic Testing: Begin by using an OBD-II scanner to confirm the P068F code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Inspect the glow plug wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Glow Plug Testing: Remove the glow plug for cylinder 8 and test its resistance with a multimeter. If the resistance is outside the manufacturer's specifications, replace the glow plug.
  4. Relay Inspection: Test the glow plug relay to ensure it is functioning correctly. Replace it if it is found to be faulty or supplying excessive voltage.
  5. ECM Check: If all other components are functioning correctly, further diagnose the ECM for any faults that may be causing incorrect voltage readings in the glow plug circuit.

Cost to Fix P068F 2014 Chevrolet Silverado

The cost to repair the P068F code can vary significantly based on the specific diagnosis and repairs needed. On average, the cost for parts and labor can range from $200 to $600. This estimate includes the cost of a new glow plug (approximately $50 to $150), a glow plug relay (around $30 to $100), and labor costs, which can vary based on local rates. Most auto repair shops charge between $80 and $150 per hour; however, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. It is advisable to check local labor rates and obtain multiple quotes for a more precise estimate tailored to your specific situation.

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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 2014 Chevrolet Silverado Code

What does the OBDII code P068F mean for a 2014 Chevrolet Silverado?

P068F indicates an issue with the glow plug control module, specifically that it is detecting high voltage in the Cylinder 8 glow plug control circuit.

What are the common symptoms of code P068F in a 2014 Chevrolet Silverado?

Symptoms may include a check engine light, hard starting in cold weather, rough idling, decreased fuel efficiency, or a noticeable lack of power.

What causes the P068F code to appear in a 2014 Chevrolet Silverado?

Common causes include a faulty glow plug control module, damaged wiring or connectors in the glow plug circuit, or a failed Cylinder 8 glow plug.

Can I drive my 2014 Chevrolet Silverado with the P068F code?

Driving with this code is generally possible, but it may result in harder starts and reduced engine performance, especially in cold weather. Prolonged issues may cause further damage.

How can I diagnose the P068F code on a 2014 Chevrolet Silverado?

Start by inspecting the wiring and connectors for Cylinder 8 and the glow plug control module. Use a multimeter to check for high voltage and test the glow plug for proper operation.

What tools do I need to troubleshoot the P068F code?

You’ll need an OBDII scanner, a multimeter, and potentially a wiring diagram for the glow plug control circuit to diagnose the issue accurately.

How do I fix the P068F code on my 2014 Chevrolet Silverado?

Repairs may include replacing the faulty glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module if it’s defective.

How much does it cost to repair the P068F code on a 2014 Chevrolet Silverado?

Costs vary depending on the repair, but replacing a glow plug typically costs $50–$150, while a new glow plug control module can range from $200–$400 plus labor.

Can a bad glow plug cause other issues in my 2014 Chevrolet Silverado?

Yes, a faulty glow plug can cause poor cold starts, increased emissions, and additional strain on the glow plug control module or battery.

How do I prevent the P068F code from recurring in my 2014 Chevrolet Silverado?

Regular maintenance, such as inspecting the glow plugs and wiring, can help prevent issues. Replacing glow plugs as recommended by the manufacturer is also important.

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