P066D 2017 GMC Sierra Code - Cylinder 2 Glow Plug Control Circuit High Voltage
Quick Answer
The P066D diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically indicates an issue with the Cylinder 2 Glow Plug Control Circuit having high voltage. Common causes include Faulty glow plug control module, Damaged wiring harness or connectors, Defective glow plug in Cylinder 2. 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 2017 GMC Sierra indicates Cylinder 2 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug control module, Damaged wiring harness or connectors, Defective glow plug in Cylinder 2.
- 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 2017 GMC Sierra Description
The P066D diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically indicates an issue with the Cylinder 2 Glow Plug Control Circuit having high voltage. Glow plugs are essential components in diesel engines, as they provide the necessary heat for combustion during cold starts. The control circuit is responsible for regulating the power sent to the glow plug, ensuring proper combustion and engine performance.
Common Causes of P066D 2017 GMC Sierra
- Faulty glow plug control module
- Damaged wiring harness or connectors
- Defective glow plug in Cylinder 2
- Issues with the engine's electrical system
- Corrosion or poor connections in the control circuit
Symptoms of P066D 2017 GMC Sierra
- Difficulty starting the engine, especially in cold weather
- Rough idling or vibrations when the engine is running
- Decreased fuel efficiency
- Engine misfires or hesitation during acceleration
- Illuminated Check Engine Light on the dashboard
How to Fix P066D 2017 GMC Sierra
- Begin by conducting a thorough diagnostic scan to confirm the P066D code and identify the specific cylinder and component affected.
- Inspect the glow plug control module, wiring harness, and glow plug in Cylinder 2 for any visible damage or defects.
- Test the voltage levels in the control circuit to determine if there is indeed high voltage and isolate the source of the issue.
- Replace any faulty components, such as the glow plug, control module, or wiring harness, as needed.
- Clear the DTC from the vehicle's computer system and test the engine to ensure proper functioning of the glow plug control circuit.
Cost to Fix P066D 2017 GMC Sierra
The typical repair costs for addressing a Cylinder 2 Glow Plug Control Circuit High Voltage issue in a 2017 GMC Sierra can range from $200 to $500, depending on the extent of the damage and the specific components that need replacement. This estimate includes parts and labor, with labor rates typically ranging between $80 and $150 per hour at most auto repair shops. However, it's important to note that prices may vary based on location, the vehicle's make and model, and the expertise of the technicians performing the repairs. It's advisable to obtain quotes from various repair facilities to compare costs and ensure a fair price for the necessary services.
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