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Engine-Codes – Chevrolet – P066E 2015 Chevrolet Silverado

P066E 2015 Chevrolet Silverado Code - Cylinder 3 Glow Plug Control Circuit Low Voltage

Quick Answer

The P066E diagnostic trouble code (DTC) specifically pertains to the glow plug control circuit for cylinder 3 in a 2015 Chevrolet Silverado. Common causes include Faulty Glow Plug: A malfunctioning glow plug that fails to heat properly can trigger the low voltage condition, Wiring Issues: Damaged or corroded wiring in the glow plug control circuit can lead to insufficient voltage reaching the glow plug, Faulty ECM: A malfunctioning Engine Control Module may not provide the correct voltage to 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
P066E 2015 Chevrolet Silverado indicates Cylinder 3 Glow Plug Control Circuit Low Voltage.
Common causes
Common causes include Faulty Glow Plug: A malfunctioning glow plug that fails to heat properly can trigger the low voltage condition, Wiring Issues: Damaged or corroded wiring in the glow plug control circuit can lead to insufficient voltage reaching the glow plug, Faulty ECM: A malfunctioning Engine Control Module may not provide the correct voltage to 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 P066E 2015 Chevrolet Silverado Description

The P066E diagnostic trouble code (DTC) specifically pertains to the glow plug control circuit for cylinder 3 in a 2015 Chevrolet Silverado. This code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the glow plug control circuit for this particular cylinder. Glow plugs are essential components in diesel engines, as they preheat the combustion chamber to facilitate easier starting, especially in cold weather. When the glow plug control circuit experiences low voltage, it can lead to inadequate heating of the glow plug, which may prevent the engine from starting efficiently or cause rough idling and misfires.

OBDII Code P066E 2015 Chevrolet Silverado - Cylinder 3 Glow Plug Control Circuit Low Voltage
P066E 2015 Chevrolet Silverado Code - Cylinder 3 Glow Plug Control Circuit Low Voltage

Common Causes of P066E 2015 Chevrolet Silverado

  1. Faulty Glow Plug: A malfunctioning glow plug that fails to heat properly can trigger the low voltage condition.
  2. Wiring Issues: Damaged or corroded wiring in the glow plug control circuit can lead to insufficient voltage reaching the glow plug.
  3. Faulty ECM: A malfunctioning Engine Control Module may not provide the correct voltage to the glow plug circuit.
  4. Poor Connections: Loose or corroded connections in the glow plug circuit can result in voltage drops.
  5. Environmental Factors: Moisture or contaminants entering the electrical connections can lead to corrosion and electrical failures.

Symptoms of P066E 2015 Chevrolet Silverado

  1. Hard Starting: Difficulty starting the engine, especially in cold weather, due to inadequate preheating of the combustion chamber.
  2. Rough Idling: The engine may run unevenly or exhibit a rough idle, indicating that the combustion process is not optimal.
  3. Increased Emissions: Higher levels of exhaust emissions due to incomplete combustion, which can lead to potential environmental compliance issues.
  4. Check Engine Light: The illumination of the check engine light on the dashboard, indicating a fault in the engine management system.
  5. Reduced Fuel Efficiency: A noticeable decrease in fuel economy as the engine struggles to operate efficiently.

How to Fix P066E 2015 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 wiring harness and connectors associated with the glow plug circuit for signs of damage, corrosion, or loose connections.
  3. Glow Plug Testing: Test the glow plug for proper operation using a multimeter to check for continuity and resistance. Replace if faulty.
  4. Repair Wiring: If any damaged wiring or connectors are found, repair or replace them to ensure proper electrical flow.
  5. ECM Check: If all other components are functioning correctly, consider testing or reprogramming the ECM to ensure it is providing the correct voltage to the glow plug circuit.

Cost to Fix P066E 2015 Chevrolet Silverado

The cost to repair the P066E code can vary widely based on the specific issue identified during diagnosis. Typical costs may range from $150 to $600, depending on whether the repair involves replacing a glow plug, repairing wiring, or addressing ECM issues. Labor rates can fluctuate 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's advisable for vehicle owners to check local rates for a more precise estimate and to obtain multiple quotes for any necessary repairs.

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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.

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