P066F 2015 GMC Sierra Code - Cylinder 3 Glow Plug Control Circuit High Voltage
Quick Answer
The P066F diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the glow plug control circuit in cylinder 3. Common causes include Faulty glow plug control module, Damaged wiring or connectors in the circuit, Defective glow plug in cylinder 3. 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
- P066F 2015 GMC Sierra indicates Cylinder 3 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug control module, Damaged wiring or connectors in the circuit, Defective glow plug in cylinder 3.
- 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 P066F 2015 GMC Sierra Description
The P066F diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the glow plug control circuit in cylinder 3. Glow plugs are crucial components in diesel engines, responsible for heating the combustion chamber during cold starts. When the engine is cold, the glow plug control module sends a signal to the glow plugs to heat up, ensuring smooth ignition and combustion. In this case, the high voltage in the circuit for cylinder 3 indicates that there is an issue with the control module or the wiring associated with the glow plug in that specific cylinder.
Common Causes of P066F 2015 GMC Sierra
- Faulty glow plug control module
- Damaged wiring or connectors in the circuit
- Defective glow plug in cylinder 3
- Malfunctioning engine control module (ECM)
- Corrosion or poor connections in the electrical system
Symptoms of P066F 2015 GMC Sierra
- Difficulty starting the engine, especially in cold weather
- Rough idling or misfires
- Decreased engine performance
- Increased fuel consumption
- Check Engine Light illuminated on the dashboard
How to Fix P066F 2015 GMC Sierra
- Begin by diagnosing the specific issue using a diagnostic scanner and multimeter to test the glow plug control circuit in cylinder 3.
- Inspect the wiring, connectors, and glow plug in cylinder 3 for any damage or corrosion. Replace any faulty components as needed.
- Test the glow plug control module for proper functionality. Replace the module if it is found to be defective.
- Clear the diagnostic trouble codes from the ECM and reset the system to ensure proper operation.
- Test the vehicle to verify that the issue has been resolved and that the glow plug in cylinder 3 is heating up correctly during cold starts.
Cost to Fix P066F 2015 GMC Sierra
The typical repair costs for addressing a P066F code in a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a glow plug control module or a defective glow plug can range from $150 to $300, including parts and labor. However, if the problem is related to damaged wiring or connectors, the repair costs may increase due to the additional labor involved in tracing and repairing the electrical connections. It is advisable to consult with a mechanic or service center for a more accurate estimate based on the specific diagnosis and repair needed. Additionally, factors such as location, vehicle make and model, and labor rates can affect the overall cost of the repair.
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