P066B 2017 GMC Sierra Code - Cylinder 1 Glow Plug Control Circuit High Voltage
Quick Answer
The P066B diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the Cylinder 1 Glow Plug Control Circuit 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 2017 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.
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Code P066B 2017 GMC Sierra Description
The P066B diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the Cylinder 1 Glow Plug Control Circuit High Voltage. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. When the engine is cold, the glow plug control module sends a signal to the glow plugs to heat up, ensuring proper combustion. In this case, the high voltage in the control circuit for Cylinder 1 indicates a potential malfunction in the glow plug system.
Common Causes of P066B 2017 GMC Sierra
- Faulty glow plug in Cylinder 1
- Damaged wiring or connectors in the glow plug control circuit
- Malfunctioning glow plug control module
- Electrical issues in the vehicle's system
- Corrosion or poor connections in the glow plug system
Symptoms of P066B 2017 GMC Sierra
- Difficulty starting the engine, especially in cold weather
- Rough idling or misfires
- Decreased fuel efficiency
- Illumination of the Check Engine Light
- Potential engine damage over time if left unresolved
How to Fix P066B 2017 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 control circuit for any corrosion, breaks, or loose connections, repairing or replacing them as needed.
- Test the glow plug control module for proper function and replace if it is found to be faulty.
- Clear the DTC and test the vehicle to ensure the issue has been resolved and that the glow plug system is operating correctly.
Cost to Fix P066B 2017 GMC Sierra
The typical repair costs for addressing a Cylinder 1 Glow Plug Control Circuit High Voltage issue can vary depending on the specific cause of the problem and the parts and labor required. In general, replacing a glow plug can cost between $50 to $150 per plug, while addressing wiring or connector issues may range from $100 to $300. The cost of a glow plug control module replacement can be around $150 to $400. Overall, the total repair cost for this issue could range from $200 to $800, including parts and labor.
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