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

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

Quick Answer

The P066F code for Chevrolet vehicles specifically indicates a problem in the Cylinder 3 Glow Plug Control Circuit, where the voltage is detected to be higher than normal. Common causes include Malfunctioning glow plug control module, Faulty wiring connections or harness, Short circuit in the glow plug control 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
P066F Chevrolet indicates Cylinder 3 Glow Plug Control Circuit High Voltage.
Common causes
Common causes include Malfunctioning glow plug control module, Faulty wiring connections or harness, Short circuit in the glow plug control 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 Sep 12, 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 Chevrolet Description

The P066F code for Chevrolet vehicles specifically indicates a problem in the Cylinder 3 Glow Plug Control Circuit, where the voltage is detected to be higher than normal. Glow plugs are essential components in diesel engines, as they help to heat the air in the combustion chamber during cold starts. When the glow plug control circuit is experiencing high voltage, it can lead to difficulties in starting the engine, reduced fuel efficiency, and even potential engine misfires.

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

Common Causes of P066F Chevrolet

  1. Malfunctioning glow plug control module.
  2. Faulty wiring connections or harness.
  3. Short circuit in the glow plug control circuit.
  4. Corrosion or damage to the glow plug terminals.
  5. Issues with the engine control module (ECM) affecting the glow plug control circuit.

Symptoms of P066F Chevrolet

  1. Difficulties starting the engine, especially in cold weather.
  2. Reduced fuel efficiency due to inefficient combustion.
  3. Engine misfires or rough idling.
  4. Illumination of the check engine light on the dashboard.
  5. Reduced engine performance and power output.

How to Fix P066F Chevrolet

  1. Begin by diagnosing the specific cause of the high voltage in the Cylinder 3 Glow Plug Control Circuit using a diagnostic scanner to retrieve the trouble codes.
  2. Inspect the glow plug control module, wiring connections, and harness for any signs of damage or corrosion. Replace any faulty components as needed.
  3. Test the glow plugs themselves to ensure they are functioning properly and replace any defective glow plugs.
  4. Clear the trouble codes from the ECM's memory and reset the system to see if the issue has been resolved.
  5. Conduct a test drive to verify that the engine starts smoothly, runs efficiently, and the check engine light remains off.

Cost to Fix P066F Chevrolet

The typical repair costs for addressing the P066F code on a Chevrolet vehicle can range from $200 to $500, including parts and labor. However, the actual costs may vary depending on the specific components that need to be replaced, the labor rates at the auto repair shop, and the location of the vehicle. It is advisable to consult with a trusted mechanic or dealership to get an accurate estimate based on the individual circumstances of the vehicle.

Need more information about the P066F Chevrolet code?

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

Need Help with the Code?

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

Information for Specific Chevrolet Models

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 Chevrolet Code

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

P066F indicates a high voltage issue in the glow plug control circuit for cylinder 3, often related to the diesel engine's preheating system.

2. What are the common symptoms of the P066F code in a Chevrolet?

Symptoms may include a check engine light, difficulty starting the engine, rough idling when cold, and reduced engine performance.

3. What causes the P066F code to appear in a Chevrolet?

Common causes include a faulty glow plug, wiring issues like damaged or corroded connections, a malfunctioning glow plug control module, or an ECM problem.

4. Can I drive my Chevrolet with a P066F code?

While the vehicle may still be drivable, it could experience starting problems and reduced efficiency, especially in cold weather. Prompt diagnosis and repair are recommended.

5. How do I diagnose the P066F code on a Chevrolet?

Diagnosis involves inspecting the glow plug for cylinder 3, checking the wiring and connections, testing the glow plug control module, and using a multimeter to verify voltage levels.

6. How much does it cost to fix the P066F code on a Chevrolet?

Repair costs vary but typically range from $100 to $300, depending on whether a glow plug, wiring repair, or control module replacement is needed.

7. Can a bad glow plug cause the P066F code?

Yes, a faulty or burned-out glow plug in cylinder 3 is a common cause of the P066F code.

8. How do I reset the P066F code on my Chevrolet after repairs?

After completing repairs, clear the code using an OBDII scanner. If the issue is resolved, the code should not return.

9. What happens if I ignore the P066F code in my Chevrolet?

Ignoring the code can lead to worsening engine performance, prolonged cold starts, and potential damage to the glow plug system or related components.

10. Can a malfunctioning ECM trigger the P066F code on a Chevrolet?

Yes, a faulty engine control module (ECM) can misinterpret or fail to regulate the glow plug circuit, causing the P066F code.

Discuss the causes and fixes for P066F Chevrolet OBDII Code

Submit a New Comment

Code P066F Chevrolet comments

No comments found for this page.