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P068F 2018 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 2018 Chevrolet Silverado. Common causes include Faulty glow plug that is shorted or open-circuited, Damaged or corroded wiring in the glow plug control circuit, Malfunctioning 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 2018 Chevrolet Silverado indicates Cylinder 8 Glow Plug Control Circuit High Voltage.
Common causes
Common causes include Faulty glow plug that is shorted or open-circuited, Damaged or corroded wiring in the glow plug control circuit, Malfunctioning 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 21, 2024
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Code P068F 2018 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 2018 Chevrolet Silverado. This code is primarily associated with diesel engines, where glow plugs are essential for starting the engine, especially in cold conditions. The glow plugs heat the combustion chamber to facilitate the ignition of the fuel-air mixture. When the Engine Control Module (ECM) detects that the voltage in the glow plug control circuit exceeds the manufacturer's specified range, it triggers this code.

OBDII Code P068F 2018 Chevrolet Silverado - Cylinder 8 Glow Plug Control Circuit High Voltage
P068F 2018 Chevrolet Silverado Code - Cylinder 8 Glow Plug Control Circuit High Voltage

Common Causes of P068F 2018 Chevrolet Silverado

  1. Faulty glow plug that is shorted or open-circuited.
  2. Damaged or corroded wiring in the glow plug control circuit.
  3. Malfunctioning glow plug relay or control module.
  4. Poor electrical connections or ground issues in the circuit.
  5. ECM software issues or internal faults.

Symptoms of P068F 2018 Chevrolet Silverado

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring during operation.
  3. Increased exhaust smoke, particularly during startup.
  4. Reduced fuel efficiency due to improper combustion.
  5. Dashboard warning lights, including the check engine light.

How to Fix P068F 2018 Chevrolet Silverado

  1. Diagnostic Testing: Use an OBD-II scanner to confirm the P068F code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the glow plug wiring harness for signs of damage, corrosion, or loose connections. Pay special attention to the connectors and the glow plug relay.
  3. Glow Plug Testing: Test the individual glow plugs for continuity and resistance to determine if any are faulty. Replace any defective glow plugs as necessary.
  4. Relay and Circuit Check: Test the glow plug relay for proper operation and check the control circuit for shorts or open circuits. Replace the relay if it is found to be defective.
  5. ECM Reprogramming or Replacement: If all other components are functioning correctly, consider reprogramming the ECM or replacing it if it is determined to be faulty.

Cost to Fix P068F 2018 Chevrolet Silverado

The cost to repair a P068F code can vary significantly based on the specific issue and the labor rates in your area. On average, you might expect to pay between $200 and $600 for repairs, which includes parts and labor. Glow plugs typically range from $20 to $100 each, while a glow plug relay can cost between $30 and $150. Labor costs can vary widely, with most auto repair shops charging between $80 and $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It is advisable to check local rates for a more precise estimate and to obtain a detailed quote after a thorough diagnosis.

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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 2018 Chevrolet Silverado Code

What does OBDII code P068F mean on a 2018 Chevrolet Silverado?

P068F indicates an issue with the glow plug control circuit for cylinder 8, specifically that the circuit is experiencing high voltage.

What are the symptoms of the P068F code on a 2018 Chevrolet Silverado?

Symptoms may include the check engine light turning on, poor engine performance, difficulty starting in cold weather, and decreased fuel efficiency.

What causes the P068F code on a 2018 Chevrolet Silverado?

Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a defective glow plug control module, or a malfunctioning engine control module (ECM).

How is the P068F code diagnosed?

A technician will use a scan tool to verify the code, inspect the cylinder 8 glow plug and its wiring for damage, and test the glow plug control module for proper operation.

Can I continue driving with the P068F code active?

While the vehicle may still run, driving with this code can lead to poor cold-start performance and may cause additional engine strain over time. Prompt diagnosis and repair are recommended.

How do you fix the P068F code on a 2018 Chevrolet Silverado?

Repairs may include replacing the faulty glow plug for cylinder 8, repairing or replacing damaged wiring or connectors, or replacing the glow plug control module if it is defective.

Is the P068F code related to cold weather performance?

Yes, the glow plug system is essential for starting a diesel engine in cold weather, and a malfunction can cause hard starts or failure to start in low temperatures.

Can a bad battery cause the P068F code?

A weak or failing battery can cause voltage issues, but it is not a direct cause of the P068F code. However, ensuring the battery is in good condition is essential when diagnosing electrical faults.

How much does it cost to fix the P068F code on a 2018 Chevrolet Silverado?

Repair costs can vary, but replacing a glow plug typically costs $100–$300, while replacing a glow plug control module can range from $300–$600, including labor.

Can a P068F code clear itself?

The code may temporarily clear if the issue resolves itself, but it is unlikely without repairs. Even if the code disappears, the underlying problem may persist and should be addressed.

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