P068D 2018 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit High Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 glow plug circuit poor electrical connection. 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 2018 Chevrolet Silverado indicates Cylinder 7 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 glow plug circuit poor electrical connection.
- 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.
Code P068D 2018 Chevrolet Silverado Description
Control of the glow plugs is accomplished by the Glow Plug Control Module. The nominal voltage for the glow plugs is 5.4 volts. When the ignition is turned On, the Glow Plug Control Module applies 7.2 V for 2.2 s, then 5.7 V for 0.8 s, and then 5.4 V until 1200°C (2192°F) is reached. The maximum voltage of the system is 10 V. While the engine is running the voltage will vary between 4.7 - 10 V when in closed loop control to maintain a glow plug temperature that ranges from 1150° - 1180°C (2102° - 2156°F). The temperature and the power consumption are controlled between the Engine Control Module (ECM) and the Glow Plug Control Module within a wide range to suit the engine's pre-heating requirements. Each glow plug is energized individually. This capability yields more optimum heat times for the glow plugs, thus pre - glow times can be kept to a minimum for a short wait to crank times and maximum glow plug durability.
What are the Possible Causes of the DTC P068D 2018 Chevrolet Silverado?
- Faulty cylinder #7 glow plug
- Cylinder #7 glow plug harness is open or shorted
- Cylinder #7 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P068D 2018 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P068D 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P068D 2018 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code P068D in a 2018 Chevrolet Silverado related to the Cylinder 7 Glow Plug Control Circuit High Voltage issue?
- Common symptoms may include rough idling, engine misfires, decreased fuel efficiency, and the illumination of the check engine light.
2. What could be the possible causes of OBDII code P068D in a 2018 Chevrolet Silverado?
- The code P068D can be triggered by issues such as a faulty glow plug, damaged wiring in the glow plug circuit, or problems with the glow plug controller.
3. How can I diagnose the Cylinder 7 Glow Plug Control Circuit High Voltage issue in my 2018 Chevrolet Silverado?
- A diagnostic scan tool can be used to read the OBDII code P068D. Further troubleshooting may involve checking the glow plug, inspecting the wiring for damage, and testing the glow plug control module.
4. Can driving with OBDII code P068D in my 2018 Chevrolet Silverado cause further damage to the vehicle?
- Continuing to drive with the Cylinder 7 Glow Plug Control Circuit High Voltage issue may lead to increased emissions, reduced engine performance, and potential damage to other engine components over time.
5. Is it safe to continue driving my 2018 Chevrolet Silverado with the check engine light on due to code P068D?
- It is not recommended to drive the vehicle with the check engine light illuminated, as the underlying issue causing the code P068D could affect the vehicle's performance and emissions.
6. How can I repair the Cylinder 7 Glow Plug Control Circuit High Voltage problem in my 2018 Chevrolet Silverado?
- Repairing the issue may involve replacing the faulty glow plug, repairing or replacing damaged wiring, or replacing the glow plug control module as needed.
7. Are there any DIY tips for addressing OBDII code P068D in a 2018 Chevrolet Silverado?
- While some basic troubleshooting like checking for loose connections or damaged wiring can be done by DIY enthusiasts, diagnosing and repairing the specific cause of the issue may require professional assistance.
8. How much does it typically cost to fix the Cylinder 7 Glow Plug Control Circuit High Voltage problem in a 2018 Chevrolet Silverado?
- The cost of repairs for OBDII code P068D can vary depending on the exact cause of the issue, but it may range from a few hundred to a thousand dollars, including parts and labor.
9. Can resetting the OBDII code P068D in my 2018 Chevrolet Silverado make the issue go away permanently?
- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the Cylinder 7 Glow Plug Control Circuit High Voltage problem is not addressed, the code is likely to reappear.
10. How often should I have my 2018 Chevrolet Silverado's glow plug system inspected to prevent OBDII code P068D from occurring?
- Regular maintenance checks, especially before the cold season, can help identify any potential issues with the glow plug system and prevent the occurrence of code P068D in your Chevrolet Silverado.
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