Engine-Codes.com
Engine-Codes – Chevrolet – P066F 2015 Chevrolet Silverado

P066F 2015 Chevrolet Silverado Code - Cylinder 3 Glow Plug Control Circuit High Voltage

Quick Answer

The OBD-II code P066F for a 2015 Chevrolet Silverado indicates a problem with the Cylinder 3 Glow Plug Control Circuit having high voltage. Common causes include Faulty glow plug in cylinder 3, Damaged or corroded wiring 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
P066F 2015 Chevrolet Silverado indicates Cylinder 3 Glow Plug Control Circuit High Voltage.
Common causes
Common causes include Faulty glow plug in cylinder 3, Damaged or corroded wiring 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 07, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P066F 2015 Chevrolet Silverado Description

The OBD-II code P066F for a 2015 Chevrolet Silverado indicates a problem with the Cylinder 3 Glow Plug Control Circuit having high voltage. Glow plugs are essential components in diesel engines, as they heat the combustion chamber to facilitate cold starts. When the engine control module (ECM) detects high voltage in the control circuit for the glow plug in cylinder 3, it triggers this diagnostic trouble code (DTC).

OBDII Code P066F 2015 Chevrolet Silverado - Cylinder 3 Glow Plug Control Circuit High Voltage
P066F 2015 Chevrolet Silverado Code - Cylinder 3 Glow Plug Control Circuit High Voltage

Common Causes of P066F 2015 Chevrolet Silverado

  1. Faulty glow plug in cylinder 3.
  2. Damaged or corroded wiring in the glow plug control circuit.
  3. Malfunctioning glow plug control module.
  4. ECM issues, such as a software glitch or hardware failure.
  5. Poor electrical connections in the circuit.

Symptoms of P066F 2015 Chevrolet Silverado

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

How to Fix P066F 2015 Chevrolet Silverado

  1. Begin by diagnosing the specific cause of the high voltage in the glow plug control circuit. This may involve using a multimeter to test the voltage at different points in the circuit.
  2. Replace the faulty glow plug in cylinder 3 if it is found to be the root cause of the issue.
  3. Inspect and repair any damaged or corroded wiring in the glow plug control circuit.
  4. Check the glow plug control module for proper operation and replace if necessary.
  5. If all components check out, consider the possibility of an ECM issue and consult with a professional technician for further diagnosis.

Cost to Fix P066F 2015 Chevrolet Silverado

The typical repair costs for addressing a P066F code in a 2015 Chevrolet Silverado can vary depending on the cause of the issue and the specific parts or components that need replacement. In general, the cost of replacing a glow plug can range from $50 to $150 per plug, while labor costs can add an additional $100 to $200. If wiring repairs or module replacements are required, the total repair costs could increase accordingly.

Need more information about the P066F 2015 Chevrolet Silverado code?

Need more information on how to fix the P066F 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P066F 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P066F 2015 Chevrolet Silverado Code

1. What does the OBDII code P066F mean on a 2015 Chevrolet Silverado?

P066F indicates a high voltage issue in the Cylinder 3 Glow Plug Control Circuit, typically related to the glow plug or its control system.

2. What are the symptoms of P066F in a 2015 Chevrolet Silverado?

Symptoms may include difficulty starting the engine in cold weather, poor performance, a check engine light, and possible rough idling.

3. What causes the P066F code to appear?

Common causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or a short circuit in the control circuit.

4. Can I drive my 2015 Silverado with a P066F code active?

While the truck may still run, driving with this code active can lead to poor cold-weather performance and potentially damage other components if not addressed promptly.

5. How do I diagnose the P066F code on my Silverado?

Start by inspecting the Cylinder 3 glow plug, wiring, and connectors for damage. Then test the glow plug and control module for proper function using a multimeter or diagnostic tool.

6. How can I fix the P066F code on a 2015 Chevy Silverado?

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

7. How much does it cost to repair the P066F code on a Silverado?

The cost varies depending on the issue, but replacing a glow plug typically costs $50–$150 for parts and labor, while control module repairs may cost $200–$500.

8. Can a bad battery cause the P066F code to appear?

Yes, a weak or failing battery can cause voltage irregularities, potentially triggering this code in the glow plug control circuit.

9. Do I need special tools to fix the P066F code?

Basic tools like a multimeter and OBDII scanner are often sufficient for diagnosis, but specialized tools may be required for glow plug removal or control module testing.

10. What could happen if I ignore the P066F code on my Silverado?

Ignoring the code could lead to starting issues in cold weather, reduced engine efficiency, and potential damage to the glow plug system or related components over time.

Discuss the causes and fixes for P066F 2015 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P066F 2015 Chevrolet Silverado comments

No comments found for this page.