P068C 2017 GMC Sierra Code - Cylinder 7 Glow Plug Control Circuit Low Voltage
Quick Answer
The P068C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Cylinder 7 Glow Plug Control Circuit having low voltage. Common causes include Faulty glow plug in cylinder 7, Poor connection or damaged wiring 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
- P068C 2017 GMC Sierra indicates Cylinder 7 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty glow plug in cylinder 7, Poor connection or damaged wiring 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 P068C 2017 GMC Sierra Description
The P068C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Cylinder 7 Glow Plug Control Circuit having low voltage. Glow plugs are essential components in diesel engines, aiding in the ignition process by heating the combustion chamber during cold starts. When the engine is cold, the glow plugs heat up to ensure efficient combustion and smooth operation. The control circuit regulates the power supply to the glow plugs, ensuring they reach the necessary temperature for ignition.
Common Causes of P068C 2017 GMC Sierra
- Faulty glow plug in cylinder 7.
- Poor connection or damaged wiring in the glow plug control circuit.
- Malfunctioning glow plug control module.
- Issues with the power supply to the glow plug.
Symptoms of P068C 2017 GMC Sierra
- Difficulty starting the engine, particularly in cold weather.
- Rough idling or misfires.
- Decreased fuel efficiency.
- Increased emissions.
- Check Engine Light illuminated on the dashboard.
How to Fix P068C 2017 GMC Sierra
- Begin by diagnosing the specific cause of the low voltage in the Cylinder 7 Glow Plug Control Circuit using a diagnostic scanner.
- Inspect the glow plug in cylinder 7 to determine if it is functioning correctly or needs replacement.
- Check the wiring harness and connections for any damage or loose connections. Repair or replace as needed.
- Test the glow plug control module to ensure it is operating properly. Replace if necessary.
- Verify the power supply to the glow plug and address any issues with the electrical system.
Cost to Fix P068C 2017 GMC Sierra
The typical repair costs for addressing a Cylinder 7 Glow Plug Control Circuit Low Voltage issue in a 2017 GMC Sierra can range from $200 to $500, including parts and labor. However, it's important to note that actual repair costs can vary based on factors such as the dealership or repair shop's labor rates, location, and the specific components that need replacement. Diagnostic time and labor rates at auto repair shops typically range between $80 and $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. Independent repair shops may offer more competitive pricing. To obtain a precise estimate, it's advisable to inquire with local auto repair facilities.
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Frequently Asked Questions about P068C 2017 GMC Sierra Code
1. What does the OBDII code P068C mean for a 2017 GMC Sierra?
P068C indicates a low voltage issue in the glow plug control circuit for cylinder 7, which can affect the engine's ability to start and perform efficiently in cold conditions.
2. What are the common symptoms of code P068C?
Symptoms may include difficulty starting the engine, rough idle, decreased fuel efficiency, and the check engine light turning on.
3. What causes the P068C code to appear?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug control circuit, a malfunctioning glow plug control module, or battery-related issues.
4. Can driving with code P068C cause damage to my GMC Sierra?
While it might not cause immediate damage, prolonged driving with this code can lead to poor engine performance and may exacerbate cold start issues.
5. How can I diagnose the P068C code?
Use a diagnostic scanner to confirm the code, then inspect the glow plug, wiring, connectors, and control module for visible damage or wear.
6. How do I fix the P068C code on a 2017 GMC Sierra?
Repairs may involve replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning connections, or replacing the glow plug control module.
7. Is code P068C specific to cold weather conditions?
Yes, the glow plug system is primarily used to assist in starting the engine during cold weather, so issues are more noticeable in colder climates.
8. How much does it cost to repair code P068C?
Repair costs vary but can range from $100 to $500, depending on whether the glow plug, wiring, or control module needs replacement.
9. Can I clear the P068C code without repairing it?
You can clear the code using a diagnostic scanner, but it will likely return unless the underlying issue is addressed.
10. How often do glow plugs need replacement in a 2017 GMC Sierra?
Glow plugs typically last 100,000 miles or more, but their lifespan can vary depending on driving conditions and maintenance practices.
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