P066E 2018 GMC Sierra Code - Cylinder 3 Glow Plug Control Circuit Low Voltage
Quick Answer
The P066E diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to an issue with the Cylinder 3 Glow Plug Control Circuit experiencing low voltage. Common causes include Faulty glow plug in Cylinder 3, 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
- P066E 2018 GMC Sierra indicates Cylinder 3 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty glow plug in Cylinder 3, 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 P066E 2018 GMC Sierra Description
The P066E diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to an issue with the Cylinder 3 Glow Plug Control Circuit experiencing low voltage. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. When the glow plug control circuit in Cylinder 3 is not receiving sufficient voltage, it can lead to difficulties starting the engine, reduced performance, and potential long-term damage if left unaddressed.
Common Causes of P066E 2018 GMC Sierra
- Faulty glow plug in Cylinder 3.
- 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 circuit.
Symptoms of P066E 2018 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idling or vibrations when the engine is running.
- Decreased fuel efficiency and power output.
- Illumination of the check engine light on the dashboard.
- Engine misfires or hesitation during acceleration.
How to Fix P066E 2018 GMC Sierra
- Begin by diagnosing the specific cause of the low voltage issue, using a multimeter to test the voltage at the glow plug in Cylinder 3.
- Inspect the glow plug, wiring, and connectors for any signs of damage or corrosion, replacing any faulty components.
- Test the glow plug control module for proper functionality and replace if necessary.
- Clear the DTC from the vehicle's computer system using an OBD-II scanner.
- Test the vehicle to ensure that the issue has been resolved and that the glow plug in Cylinder 3 is receiving the correct voltage.
Cost to Fix P066E 2018 GMC Sierra
The typical repair costs for addressing a Cylinder 3 Glow Plug Control Circuit Low Voltage issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts required for this repair may cost between $50 and $200, while the labor costs can range from $100 to $300. It's important to note that these estimates are general guidelines, and actual costs may differ based on the extent of the damage, the need for additional parts or services, and the rates charged by the auto repair shop. Be sure to consult with a qualified mechanic or service center to get an accurate estimate for your specific situation.
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