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P066B Chevrolet Code - Cylinder 1 Glow Plug Control Circuit High Voltage

Quick Answer

The P066B diagnostic trouble code for Chevrolet vehicles indicates an issue with the Cylinder 1 Glow Plug Control Circuit experiencing high voltage. Common causes include Faulty glow plug in Cylinder 1, Damaged wiring or connectors in the glow plug circuit, Malfunctioning glow plug control module. 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
P066B Chevrolet indicates Cylinder 1 Glow Plug Control Circuit High Voltage.
Common causes
Common causes include Faulty glow plug in Cylinder 1, Damaged wiring or connectors in the glow plug circuit, Malfunctioning glow plug control module.
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
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Code P066B Chevrolet Description

The P066B diagnostic trouble code for Chevrolet vehicles indicates an issue with the Cylinder 1 Glow Plug Control Circuit experiencing high voltage. Glow plugs are essential components in diesel engines, responsible for heating the combustion chamber to facilitate ignition, especially in cold weather conditions. When this code is triggered, it means that the control circuit for the glow plug in Cylinder 1 is receiving a voltage level above the specified range, leading to potential performance issues and risks.

OBDII Code P066B Chevrolet - Cylinder 1 Glow Plug Control Circuit High Voltage
P066B Chevrolet Code - Cylinder 1 Glow Plug Control Circuit High Voltage

Common Causes of P066B Chevrolet

  1. Faulty glow plug in Cylinder 1.
  2. Damaged wiring or connectors in the glow plug circuit.
  3. Malfunctioning glow plug control module.
  4. Issues with the engine control module (ECM) sending incorrect signals.
  5. Electrical issues such as a short circuit in the control circuit.

Symptoms of P066B Chevrolet

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or engine misfires.
  3. Decreased fuel efficiency.
  4. Increased emissions.
  5. Engine performance issues such as reduced power output.

How to Fix P066B Chevrolet

  1. Perform a thorough inspection of the glow plug in Cylinder 1 and test its functionality.
  2. Check the wiring and connectors in the glow plug circuit for any damage or corrosion.
  3. Test the glow plug control module for proper operation and replace if necessary.
  4. Scan the engine control module (ECM) for any fault codes and address any underlying issues.
  5. Clear the diagnostic trouble code and test the vehicle to ensure the issue has been resolved.

Cost to Fix P066B Chevrolet

The cost of repairing a Cylinder 1 Glow Plug Control Circuit High Voltage issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts for replacing a glow plug or control module can range from $50 to $200, while the labor costs may range from $100 to $300. Overall, the total repair cost could be anywhere from $150 to $500, but it's recommended to get a detailed estimate from a trusted auto repair shop 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 P066B Chevrolet Code

What does the OBDII code P066B mean on a Chevrolet?

The P066B code indicates a high voltage issue in the Cylinder 1 Glow Plug Control Circuit, which helps heat the glow plug for proper engine starting in diesel vehicles.

What are the common symptoms of the P066B code?

Symptoms may include difficulty starting the engine, rough idling, reduced fuel efficiency, and an illuminated check engine light.

What causes the P066B code to appear?

Possible causes include a faulty glow plug, damaged glow plug control module, wiring issues (e.g., frayed wires or poor connections), or a malfunctioning ECU.

Can I drive my Chevrolet with the P066B code?

Driving with this code is not recommended, as it may lead to hard starting, increased emissions, or further damage to the glow plug system.

How do I diagnose the P066B code on my Chevrolet?

Diagnosis involves inspecting the glow plug, wiring, and connectors for damage, testing the glow plug control module, and using a multimeter to check circuit voltage.

How can I fix the P066B code?

Repairs may include replacing the faulty glow plug, repairing damaged wiring, cleaning or tightening connections, or replacing the glow plug control module.

What tools are needed to troubleshoot the P066B code?

You may need an OBDII scanner, a multimeter, wire repair tools, and possibly a replacement glow plug or control module.

Is the P066B code covered under warranty for my Chevrolet?

Warranty coverage depends on your vehicle’s age, mileage, and warranty terms. Consult your dealership or warranty provider for details.

How much does it cost to repair the P066B code?

Repair costs vary, ranging from $50–$150 for a new glow plug to $200–$500 if the glow plug control module needs replacement, plus labor charges.

Can a bad battery cause the P066B code?

Yes, a weak or failing battery can result in insufficient power to the glow plug circuit, potentially triggering the P066B code.

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