P066B 2014 GMC Sierra Code - Cylinder 1 Glow Plug Control Circuit High Voltage
Quick Answer
The diagnostic trouble code P066B for a 2014 GMC Sierra refers to 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 control 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 2014 GMC Sierra 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 control 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P066B 2014 GMC Sierra Description
The diagnostic trouble code P066B for a 2014 GMC Sierra refers to an issue with the Cylinder 1 Glow Plug Control Circuit experiencing high voltage. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. When the control circuit for the glow plug in Cylinder 1 is detecting high voltage, it indicates a malfunction that can lead to various performance issues in the vehicle.
Common Causes of P066B 2014 GMC Sierra
- Faulty glow plug in Cylinder 1.
- Damaged wiring or connectors in the glow plug control circuit.
- Malfunctioning glow plug control module.
- Issues with the engine control module (ECM).
- Corrosion or poor connections in the electrical system.
Symptoms of P066B 2014 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idling or engine misfires.
- Decreased fuel efficiency.
- Engine stalling or hesitation during acceleration.
- Illumination of the Check Engine Light on the dashboard.
How to Fix P066B 2014 GMC Sierra
- Begin by diagnosing the specific cause of the high voltage in the Cylinder 1 glow plug control circuit using a diagnostic scanner.
- Inspect the glow plug in Cylinder 1 for any signs of damage or malfunction and replace if necessary.
- Check the wiring and connectors in the glow plug control circuit for any corrosion, breaks, or loose connections, and repair or replace as needed.
- Test the glow plug control module and the engine control module for proper operation and replace if found to be faulty.
- Clear the diagnostic trouble codes, reset the ECM, and test the vehicle to ensure the issue has been resolved.
Cost to Fix P066B 2014 GMC Sierra
The typical repair costs for addressing a Cylinder 1 Glow Plug Control Circuit High Voltage issue in a 2014 GMC Sierra can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower rates. It's recommended to inquire about local rates to obtain a more accurate estimate for this repair.
Need more information about the P066B 2014 GMC Sierra code?
Need more information on how to fix the P066B 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P066B 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P066B 2014 GMC Sierra Code
1. What does the OBDII code P066B mean on a 2014 GMC Sierra?
The P066B code indicates a high voltage issue in the glow plug control circuit for cylinder 1, which affects the engine's starting and warming process in cold conditions.
2. What are the common symptoms of the P066B code on a 2014 GMC Sierra?
Symptoms may include difficulty starting the engine in cold weather, poor fuel efficiency, rough idling, and an illuminated check engine light.
3. What causes the P066B code to appear on a 2014 GMC Sierra?
Possible causes include a faulty glow plug, damaged wiring or connectors in the cylinder 1 glow plug circuit, a defective glow plug control module, or a short or open circuit.
4. Can I drive my 2014 GMC Sierra with the P066B code?
While the truck may be drivable, it could experience starting issues in cold weather and reduced performance. It’s best to address the issue promptly to avoid further damage.
5. How do I diagnose the P066B code on a 2014 GMC Sierra?
Diagnosis involves inspecting the glow plug for cylinder 1, checking the wiring and connectors for damage, and testing the glow plug control module for proper operation.
6. How can I fix the P066B code on my 2014 GMC Sierra?
Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring, or replacing the glow plug control module if it is defective.
7. How much does it cost to repair the P066B code on a 2014 GMC Sierra?
The repair cost can range from $100 to $500 depending on whether you need a new glow plug, wiring repair, or a replacement control module.
8. Can a bad glow plug cause engine damage on a 2014 GMC Sierra?
A bad glow plug itself won’t directly damage the engine, but prolonged issues with starting or incomplete combustion can lead to other engine problems over time.
9. How do I prevent the P066B code from returning on my 2014 GMC Sierra?
Regularly inspect and maintain the glow plugs, wiring, and control module, especially before colder weather, to prevent circuit issues.
10. Will a P066B code cause my 2014 GMC Sierra to fail an emissions test?
It might, as a malfunctioning glow plug can lead to incomplete combustion and increased emissions, which could fail the test.
Discuss the causes and fixes for P066B 2014 GMC Sierra OBDII Code
Code P066B 2014 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.