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Engine-Codes – Generic – P066E

P066E Code - Cylinder 3 Glow Plug Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code P066E indicates an issue with the cylinder 3 glow plug control circuit in a vehicle. Common causes include Faulty glow plug in cylinder 3, Damaged wiring or connectors in the glow plug control circuit, Malfunctioning glow plug relay. 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 indicates Cylinder 3 Glow Plug Control Circuit Low Voltage.
Common causes
Common causes include Faulty glow plug in cylinder 3, Damaged wiring or connectors in the glow plug control circuit, Malfunctioning glow plug relay.
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 16, 2024
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Code P066E Description

The diagnostic trouble code P066E indicates an issue with the cylinder 3 glow plug control circuit in a vehicle. Glow plugs are essential components in diesel engines, as they help to heat the combustion chamber for easier starting, especially in cold weather conditions. When the control circuit for the glow plug in cylinder 3 is experiencing low voltage, it means that there is a problem with the electrical system responsible for activating the glow plug in that specific cylinder.

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

Common Causes of P066E

  1. Faulty glow plug in cylinder 3.
  2. Damaged wiring or connectors in the glow plug control circuit.
  3. Malfunctioning glow plug relay.
  4. Issues with the vehicle's electrical system.
  5. Corrosion or poor connections in the circuit.

Symptoms of P066E

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

How to Fix P066E

  1. Begin by diagnosing the specific cause of the low voltage in the cylinder 3 glow plug control circuit using a diagnostic scanner.
  2. Inspect the glow plug in cylinder 3 for proper operation and replace if necessary.
  3. Check the wiring and connectors in the control circuit for any damage or corrosion, repairing or replacing as needed.
  4. Test the glow plug relay for proper function and replace if faulty.
  5. Clear the diagnostic trouble code from the vehicle's computer and test the system to ensure proper operation.

Cost to Fix P066E

The typical repair costs for addressing a cylinder 3 glow plug control circuit low voltage issue can vary depending on the specific cause of the problem and the vehicle's make and model. In general, the cost of replacing a glow plug can range from $50 to $150 per plug, while the cost of diagnosing and repairing wiring or relay issues can add to the total cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. It is advisable to consult with a trusted mechanic or shop for a more accurate estimate based on the specific circumstances.

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Code P066E Information for Specific Makes

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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