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P066E 2016 Chevrolet Silverado Code - Cylinder 3 Glow Plug Control Circuit Low Voltage

Quick Answer

The P066E diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a low voltage condition in the glow plug control circuit for cylinder 3. Common causes include Faulty glow plug for cylinder 3, Damaged or corroded wiring in the glow plug control circuit, Malfunctioning glow plug relay or fuse. 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
P066E 2016 Chevrolet Silverado indicates Cylinder 3 Glow Plug Control Circuit Low Voltage.
Common causes
Common causes include Faulty glow plug for cylinder 3, Damaged or corroded wiring in the glow plug control circuit, Malfunctioning glow plug relay or fuse.
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 02, 2024
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Code P066E 2016 Chevrolet Silverado Description

The P066E diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a low voltage condition in the glow plug control circuit for cylinder 3. Glow plugs are essential components in diesel engines, responsible for preheating the combustion chamber to facilitate cold starts and optimize combustion efficiency. When the ECM identifies a low voltage in the glow plug control circuit, it signifies that the glow plug for cylinder 3 is not receiving the necessary voltage to operate effectively.

OBDII Code P066E 2016 Chevrolet Silverado - Cylinder 3 Glow Plug Control Circuit Low Voltage
P066E 2016 Chevrolet Silverado Code - Cylinder 3 Glow Plug Control Circuit Low Voltage

Common Causes of P066E 2016 Chevrolet Silverado

  1. Faulty glow plug for cylinder 3.
  2. Damaged or corroded wiring in the glow plug control circuit.
  3. Malfunctioning glow plug relay or fuse.
  4. Issues with the Engine Control Module (ECM) or its programming.
  5. Poor electrical connections or grounding issues in the circuit.

Symptoms of P066E 2016 Chevrolet Silverado

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring when the engine is running.
  3. Increased exhaust smoke, particularly during startup.
  4. Reduced engine power and acceleration.
  5. Check Engine Light (CEL) illuminated on the dashboard.

How to Fix P066E 2016 Chevrolet Silverado

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the P066E code and check for any additional codes that may indicate related issues.
  2. Visual Inspection: Inspect the glow plug and its wiring for any visible damage, corrosion, or loose connections. Pay close attention to the glow plug relay and fuse.
  3. Testing the Glow Plug: Use a multimeter to test the resistance of the glow plug. If it shows infinite resistance, it is likely faulty and needs replacement.
  4. Repair or Replace Wiring: If damaged wiring is found, repair or replace it to ensure proper voltage delivery to the glow plug.
  5. ECM Check: If all components are functioning correctly, consider checking the ECM for faults or reprogramming if necessary.

Cost to Fix P066E 2016 Chevrolet Silverado

** The typical repair costs for addressing a P066E code can range from $150 to $600. This estimate includes parts such as glow plugs (which can cost between $20 to $100 each), wiring repairs, and labor costs. Labor rates can vary widely based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It is advisable to check local rates for a more precise estimate. Additionally, if multiple glow plugs are failing or if the ECM requires reprogramming, costs may increase accordingly.

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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 P066E 2016 Chevrolet Silverado Code

1. What does the OBDII code P066E mean on a 2016 Chevrolet Silverado?

P066E indicates a low voltage issue in the Cylinder 3 Glow Plug Control Circuit, which is responsible for preheating the cylinder for efficient combustion in cold conditions.

2. What are the common symptoms of code P066E?

Common symptoms include difficulty starting in cold weather, rough idling, reduced fuel efficiency, and the check engine light being illuminated.

3. What causes the P066E code in a Chevy Silverado?

Possible causes include a faulty glow plug for cylinder 3, damaged wiring or connectors in the glow plug circuit, a failed glow plug control module, or corrosion in the electrical connections.

4. Can I drive my 2016 Chevrolet Silverado with code P066E?

While the truck may still be drivable, prolonged operation with this code can lead to starting issues, especially in cold weather, and may cause further damage to the glow plug system.

5. How do I diagnose the P066E code?

Start by visually inspecting the wiring and connectors for damage or corrosion, test the cylinder 3 glow plug for proper resistance, and check the glow plug control module for functionality.

6. How much does it cost to repair code P066E?

Repair costs vary depending on the issue. Replacing a glow plug typically costs $50–$150 for parts and labor, while repairing wiring or replacing the control module may cost more.

7. Can a bad battery cause the P066E code?

Yes, a weak or failing battery can result in insufficient voltage to the glow plug circuit, potentially triggering this code.

8. How can I prevent the P066E code from appearing again?

Regularly inspect and maintain the glow plug system, including checking for corrosion and ensuring proper voltage from the battery and alternator.

9. Do I need to replace all glow plugs if one fails?

It’s not mandatory, but replacing all glow plugs simultaneously can ensure consistent performance and prevent future issues.

10. Can a bad glow plug damage my engine?

A single bad glow plug is unlikely to cause significant engine damage but can lead to hard starts, misfires, and increased wear on other components over time.

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