P068F Chevrolet Code - Cylinder 8 Glow Plug Control Circuit High Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #8 glow plug, Cylinder #8 glow plug harness is open or shorted, Cylinder #8 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
- P068F Chevrolet indicates Cylinder 8 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty cylinder #8 glow plug, Cylinder #8 glow plug harness is open or shorted, Cylinder #8 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 P068F Chevrolet 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 P068F Chevrolet?
- Faulty cylinder #8 glow plug
- Cylinder #8 glow plug harness is open or shorted
- Cylinder #8 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P068F Chevrolet?
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 P068F Chevrolet 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.
Need more information about the P068F Chevrolet code?
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Information for Specific Chevrolet Models
- P068F 2014 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit High Voltage
- P068F 2015 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit High Voltage
- P068F 2016 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit High Voltage
- P068F 2017 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit High Voltage
- P068F 2018 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit High Voltage
Frequently Asked Questions about P068F Chevrolet Code
1. What does the OBDII code P068F mean for a Chevrolet vehicle?
P068F indicates a high voltage issue in the cylinder 8 glow plug control circuit, which is responsible for heating the glow plug used in diesel engines for cold starts.
2. What are the common symptoms of code P068F in a Chevrolet?
Symptoms may include difficulty starting the engine in cold weather, rough idling, decreased engine performance, or an illuminated check engine light.
3. What causes the P068F code to trigger in a Chevrolet vehicle?
Possible causes include a faulty glow plug, damaged wiring, a malfunctioning glow plug control module, or corrosion in the electrical connections.
4. Can a bad glow plug cause the P068F code in my Chevrolet?
Yes, a faulty glow plug in cylinder 8 can cause this code, as it disrupts the proper voltage in the control circuit.
5. How do I diagnose the P068F code on my Chevrolet?
Diagnose by checking the glow plug in cylinder 8, inspecting wiring and connectors for damage, and testing the glow plug control module for faults.
6. Is it safe to drive with the P068F code on my Chevrolet?
While the vehicle may still run, driving with this code can lead to starting issues, especially in cold weather, and may cause further damage to the glow plug system.
7. How much does it cost to fix the P068F code on a Chevrolet?
Repair costs vary but may range from $100 to $300, depending on whether the glow plug, wiring, or control module needs to be repaired or replaced.
8. Can I fix the P068F code on my Chevrolet myself?
If you're experienced with vehicle electronics, you can inspect and replace the glow plug or damaged wiring. Otherwise, it's best to consult a mechanic.
9. How can I prevent the P068F code from occurring on my Chevrolet?
Regular maintenance, including inspecting the glow plugs and electrical connections, can help prevent this code from appearing.
10. Will clearing the P068F code with a scanner fix the issue on my Chevrolet?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.
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