P066E 2017 GMC Sierra Code - Cylinder 3 Glow Plug Control Circuit Low Voltage
Quick Answer
The P066E diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Cylinder 3 Glow Plug Control Circuit, specifically low voltage. Common causes include Faulty glow plug in Cylinder 3, Damaged wiring harness connecting 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
- P066E 2017 GMC Sierra indicates Cylinder 3 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty glow plug in Cylinder 3, Damaged wiring harness connecting 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 P066E 2017 GMC Sierra Description
The P066E diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Cylinder 3 Glow Plug Control Circuit, specifically low voltage. Glow plugs are essential components in diesel engines, as they heat the combustion chamber to facilitate cold starts. When the engine is cold, the glow plug control module sends a signal to the glow plugs to heat up, ensuring proper ignition of the fuel-air mixture. In the case of Cylinder 3, the control circuit is not receiving the expected voltage, which can lead to difficulties starting the engine, reduced performance, and increased emissions.
Common Causes of P066E 2017 GMC Sierra
- Faulty glow plug in Cylinder 3.
- Damaged wiring harness connecting the glow plug control circuit.
- Malfunctioning glow plug control module.
- Poor electrical connection or corrosion in the circuit.
- Issues with the vehicle's battery or charging system affecting voltage supply.
Symptoms of P066E 2017 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idling or engine misfires.
- Decreased fuel efficiency.
- Illumination of the check engine light.
- Increased emissions during operation.
How to Fix P066E 2017 GMC Sierra
- Begin by diagnosing the specific cause of the low voltage in the Cylinder 3 glow plug control circuit using a diagnostic scan tool.
- Inspect the glow plug in Cylinder 3 for proper operation and replace if necessary.
- Check the wiring harness for any damage or corrosion, repairing or replacing as needed.
- Test the glow plug control module for functionality and replace if it is found to be faulty.
- Ensure all electrical connections in the circuit are secure and free of corrosion to maintain proper voltage supply.
Cost to Fix P066E 2017 GMC Sierra
The typical repair costs for addressing a Cylinder 3 Glow Plug Control Circuit Low Voltage issue in a 2017 GMC Sierra can vary depending on the specific cause of the problem and the parts needed for repair. On average, the cost of replacing a glow plug can range from $50 to $150 per plug, while a glow plug control module can cost between $100 and $300. Labor costs at auto repair shops can range from $80 to $150 per hour, with the total repair bill likely falling between $200 and $500. It's advisable to consult with a professional mechanic to get an accurate estimate based on the specific diagnosis and repair needs of your vehicle.
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