P068D 2017 GMC Sierra Code - Cylinder 7 Glow Plug Control Circuit High Voltage
Quick Answer
The P068D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the cylinder 7 glow plug control circuit experiencing high voltage. Common causes include Faulty glow plug in cylinder 7, Damaged wiring harness connected to the glow plug, 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
- P068D 2017 GMC Sierra indicates Cylinder 7 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug in cylinder 7, Damaged wiring harness connected to the glow plug, 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 P068D 2017 GMC Sierra Description
The P068D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the cylinder 7 glow plug control circuit experiencing high voltage. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. In this case, the control circuit for the glow plug in cylinder 7 is detecting a voltage higher than the specified range, which can lead to various issues.
Common Causes of P068D 2017 GMC Sierra
- Faulty glow plug in cylinder 7.
- Damaged wiring harness connected to the glow plug.
- Malfunctioning glow plug control module.
- Issue with the engine control unit (ECU).
- Corrosion or poor connection in the electrical system related to the glow plug.
Symptoms of P068D 2017 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idling or engine misfires.
- Decreased fuel efficiency.
- Illumination of the check engine light on the dashboard.
How to Fix P068D 2017 GMC Sierra
- Begin by diagnosing the specific cause of the high voltage in the cylinder 7 glow plug control circuit using a diagnostic scanner.
- Inspect the glow plug in cylinder 7 for any signs of damage or wear and replace if necessary.
- Check the wiring harness connected to the glow plug for any visible damage or corrosion and repair or replace as needed.
- Test the glow plug control module and the engine control unit to ensure they are functioning correctly, replacing them if faulty.
- Clear the DTC from the vehicle's ECU using the diagnostic scanner after completing the repairs and test the vehicle to ensure the issue has been resolved.
Cost to Fix P068D 2017 GMC Sierra
The typical repair costs for addressing a cylinder 7 glow plug control circuit high voltage issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of replacing a glow plug can range from $50 to $150 per plug, while the cost of a glow plug control module or an engine control unit can be higher, potentially ranging from $200 to $500 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair cost can also be influenced by the location of the shop, the vehicle make and model, and the engine type. It is advisable to obtain a detailed estimate from a local auto repair shop to determine the precise cost for addressing this issue in a 2017 GMC Sierra.
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Frequently Asked Questions about P068D 2017 GMC Sierra Code
1. What does the OBDII code P068D mean on a 2017 GMC Sierra?
P068D indicates a high voltage issue in the Cylinder 7 Glow Plug Control Circuit, which helps the glow plug function properly during cold starts.
2. What are the symptoms of code P068D on a 2017 GMC Sierra?
Common symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and an illuminated check engine light.
3. What causes the P068D code to appear on a 2017 GMC Sierra?
Possible causes include a faulty glow plug for Cylinder 7, damaged wiring or connectors, a malfunctioning glow plug control module, or corrosion within the circuit.
4. Can I drive my 2017 GMC Sierra with the P068D code?
While the vehicle may be drivable, ignoring the code can lead to poor performance, increased emissions, and potential long-term engine damage, especially in cold weather.
5. How do I fix the P068D code on my 2017 GMC Sierra?
Repairs may include replacing the Cylinder 7 glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module if necessary.
6. How do I diagnose the P068D code on a 2017 GMC Sierra?
Start by inspecting the Cylinder 7 glow plug and its wiring for damage or corrosion, then test the glow plug control module using a multimeter to check for excessive voltage.
7. What tools are needed to repair a P068D code on a 2017 GMC Sierra?
Common tools include a multimeter, OBDII scanner, basic hand tools for removing the glow plug, and potentially dielectric grease for corrosion prevention.
8. How much does it cost to fix the P068D code on a 2017 GMC Sierra?
Repair costs vary but may range from $50 to $200 for a glow plug replacement and up to $300 or more if the glow plug control module needs replacement.
9. Can a bad battery cause the P068D code on a 2017 GMC Sierra?
Yes, a weak or failing battery can cause voltage irregularities that might contribute to glow plug circuit issues, including triggering the P068D code.
10. Does clearing the P068D code fix the problem on a 2017 GMC Sierra?
Clearing the code with an OBDII scanner will temporarily remove the warning, but the underlying issue must be addressed to prevent the code from returning.
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