P066D 2016 GMC Sierra Code - Cylinder 2 Glow Plug Control Circuit High Voltage
Quick Answer
The diagnostic trouble code P066D for a 2016 GMC Sierra indicates an issue with the Cylinder 2 Glow Plug Control Circuit experiencing high voltage. Common causes include Faulty glow plug in Cylinder 2, Damaged wiring harness or connector in the 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
- P066D 2016 GMC Sierra indicates Cylinder 2 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug in Cylinder 2, Damaged wiring harness or connector in the 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 P066D 2016 GMC Sierra Description
The diagnostic trouble code P066D for a 2016 GMC Sierra indicates an issue with the Cylinder 2 Glow Plug Control Circuit experiencing high voltage. Glow plugs are crucial components in diesel engines, especially during cold starts, as they heat the combustion chamber to facilitate ignition. The control circuit ensures the proper functioning of the glow plug system by regulating voltage levels. When the control circuit detects high voltage in Cylinder 2, it can lead to various performance issues and potential long-term damage if left unaddressed.
Common Causes of P066D 2016 GMC Sierra
- Faulty glow plug in Cylinder 2.
- Damaged wiring harness or connector in the control circuit.
- Malfunctioning glow plug control module.
- Issues with the vehicle's ECM.
- Corrosion or poor connections in the glow plug system.
Symptoms of P066D 2016 GMC Sierra
- Difficulties in starting the engine, especially in cold weather.
- Misfires and rough idling.
- Decreased fuel efficiency.
- Engine stalling.
- Illumination of the Check Engine Light.
How to Fix P066D 2016 GMC Sierra
- Begin by diagnosing the specific cause of the high voltage in the Cylinder 2 Glow Plug Control Circuit using a diagnostic scanner.
- Inspect the glow plug in Cylinder 2 for any signs of damage or malfunction and replace if necessary.
- Check the wiring harness and connectors for any corrosion or damage, repairing or replacing them as needed.
- Test the glow plug control module and the ECM for proper functioning, replacing them if they are faulty.
- Clear the diagnostic trouble code from the vehicle's system and test the vehicle to ensure the issue has been resolved.
Cost to Fix P066D 2016 GMC Sierra
The typical repair costs for addressing a Cylinder 2 Glow Plug Control Circuit High Voltage issue can range from $200 to $500, including parts and labor. However, 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. It's recommended to inquire about local rates for a more accurate estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.
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