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P066A Chevrolet Code - Cylinder 1 Glow Plug Control Circuit Low Voltage

Quick Answer

The P066A code for Chevrolet indicates an issue with the Cylinder 1 Glow Plug Control Circuit, specifically low voltage. Common causes include Faulty glow plug in Cylinder 1, Wiring issues or damaged connectors in the glow plug control circuit, Faulty 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
P066A Chevrolet indicates Cylinder 1 Glow Plug Control Circuit Low Voltage.
Common causes
Common causes include Faulty glow plug in Cylinder 1, Wiring issues or damaged connectors in the glow plug control circuit, Faulty 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 Aug 18, 2024
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Code P066A Chevrolet Description

The P066A code for Chevrolet indicates an issue with the Cylinder 1 Glow Plug Control Circuit, specifically low voltage. Glow plugs are essential for starting a diesel engine, as they heat up the combustion chamber to facilitate ignition when the engine is cold. The control circuit is responsible for regulating the voltage to the glow plug in Cylinder 1. When the voltage is too low, the glow plug may not heat up sufficiently, leading to difficulties in starting the engine, reduced fuel efficiency, and increased emissions.

OBDII Code P066A Chevrolet - Cylinder 1 Glow Plug Control Circuit Low Voltage
P066A Chevrolet Code - Cylinder 1 Glow Plug Control Circuit Low Voltage

Common Causes of P066A Chevrolet

  1. Faulty glow plug in Cylinder 1.
  2. Wiring issues or damaged connectors in the glow plug control circuit.
  3. Faulty glow plug relay.
  4. ECM (Engine Control Module) malfunction.
  5. Corrosion or poor connections in the circuit.

Symptoms of P066A Chevrolet

  1. Difficulties in starting the engine, especially in cold weather.
  2. Engine misfires or rough idling.
  3. Reduced fuel efficiency.
  4. Illumination of the Check Engine Light.
  5. Increased emissions.

How to Fix P066A Chevrolet

  1. Perform a visual inspection of the glow plug, wiring, and connectors for any visible damage or corrosion.
  2. Test the glow plug using a multimeter to check for proper resistance.
  3. Check the glow plug relay for functionality and replace if necessary.
  4. Test the ECM to ensure it is sending the correct voltage signal to the glow plug.
  5. Clear the trouble codes, start the vehicle, and monitor for any recurring issues.

Cost to Fix P066A Chevrolet

The cost estimate for repairing a Cylinder 1 Glow Plug Control Circuit Low Voltage issue can vary depending on the specific cause of the problem. On average, replacing a glow plug can cost between $50 to $150 per plug, while a glow plug relay may cost around $50 to $100. Labor costs can range from $100 to $300, depending on the shop's hourly rate. It's recommended to consult with a mechanic or dealership for a more accurate cost estimate based on your vehicle's make and model.

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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 P066A Chevrolet Code

1. What does the OBDII code P066A mean on a Chevrolet?

P066A indicates a low voltage issue in the glow plug control circuit for cylinder 1, typically related to the glow plug system in diesel engines.

2. What are the common symptoms of code P066A?

Symptoms may include difficulty starting the engine, poor cold-weather performance, a check engine light, and reduced fuel efficiency.

3. What causes the P066A code to appear?

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

4. Can I drive my Chevrolet with a P066A code?

While the vehicle may still run, driving with this code can lead to hard starts in cold weather and potential long-term damage to the engine if not addressed.

5. How do I diagnose the P066A code?

Start by inspecting the glow plug and its wiring for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit, and test the glow plug control module for proper operation.

6. How much does it cost to fix the P066A code on a Chevrolet?

Repair costs vary but typically range from $100 to $300, depending on whether the glow plug, wiring, or control module needs replacement.

7. Can a dead battery cause the P066A code?

A weak or dead battery can contribute to the code by providing insufficient voltage to the glow plug circuit, but this is less common than other causes.

8. How do I reset the P066A code after repairs?

After fixing the issue, use an OBDII scanner to clear the code. If the problem is resolved, the code should not return.

9. What happens if I ignore the P066A code?

Ignoring this code may lead to hard engine starts, reduced engine performance, and increased wear on the engine during cold weather operation.

10. Can a faulty glow plug control module trigger the P066A code?

Yes, a malfunctioning glow plug control module can fail to deliver the necessary voltage to the glow plug, causing the code to appear.

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