P066C 2017 GMC Sierra Code - Cylinder 2 Glow Plug Control Circuit Low Voltage
Quick Answer
The P066C diagnostic trouble code for a 2017 GMC Sierra specifically refers to an issue with the Cylinder 2 Glow Plug Control Circuit displaying low voltage. Common causes include Faulty glow plug in Cylinder 2, Wiring or connection issues 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
- P066C 2017 GMC Sierra indicates Cylinder 2 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty glow plug in Cylinder 2, Wiring or connection issues 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 P066C 2017 GMC Sierra Description
The P066C diagnostic trouble code for a 2017 GMC Sierra specifically refers to an issue with the Cylinder 2 Glow Plug Control Circuit displaying low voltage. Glow plugs are used in diesel engines to help with cold starting by heating the combustion chamber. In this case, low voltage in the control circuit for the glow plug of Cylinder 2 means that there is insufficient power being supplied to properly heat the glow plug, which can lead to difficulties in starting the engine, especially in cold weather conditions. This can result in rough idle, decreased fuel efficiency, and potential engine misfires.
Common Causes of P066C 2017 GMC Sierra
- Faulty glow plug in Cylinder 2.
- Wiring or connection issues in the glow plug control circuit.
- Malfunctioning glow plug control module.
- Electrical system issues such as a blown fuse or relay.
- ECU (Engine Control Unit) malfunction.
Symptoms of P066C 2017 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idle or engine misfires.
- Decreased fuel efficiency.
- Illumination of the check engine light.
- Engine may run poorly or lack power.
How to Fix P066C 2017 GMC Sierra
- Begin by diagnosing the specific cause of the low voltage in the Cylinder 2 glow plug control circuit using a diagnostic scanner.
- Inspect and test the glow plug in Cylinder 2 to ensure it is functioning properly. Replace if necessary.
- Check the wiring and connections in the glow plug control circuit for any damage or corrosion. Repair or replace as needed.
- Test the glow plug control module and replace if it is found to be faulty.
- Verify the operation of the electrical system components such as fuses, relays, and the ECU to ensure proper functioning.
Cost to Fix P066C 2017 GMC Sierra
The cost of repairing a Cylinder 2 Glow Plug Control Circuit Low Voltage issue can vary depending on the specific cause of the problem and the labor rates in your area. Generally, the cost of parts such as a new glow plug, control module, or wiring harness can range from $50 to $200. Labor costs typically range from $100 to $300, depending on the complexity of the repair and the shop's hourly rates. Overall, you can expect to pay anywhere from $150 to $500 for this repair, but it's advisable to get a detailed quote from a trusted auto repair shop in your area.
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