P068D Chevrolet 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 Chevrolet 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 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 P068D Chevrolet?
- 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 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 P068D 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.
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Information for Specific Chevrolet Models
- P068D 2014 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit High Voltage
- P068D 2015 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit High Voltage
- P068D 2016 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit High Voltage
- P068D 2017 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit High Voltage
- P068D 2018 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit High Voltage
Frequently Asked Questions about P068D Chevrolet Code
1. What are the common symptoms of OBDII code P068D in a Chevrolet related to the Cylinder 7 Glow Plug Control Circuit High Voltage?
Symptoms may include rough idling, misfires, decreased fuel efficiency, and the illumination of the check engine light.
2. What could be causing the Cylinder 7 Glow Plug Control Circuit High Voltage error code in a Chevrolet?
Possible causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or a problem with the engine control module (ECM).
3. How can I diagnose the issue causing the P068D code in a Chevrolet Cylinder 7 Glow Plug Control Circuit High Voltage?
Diagnosis usually involves checking the glow plug, inspecting the wiring and connectors for damage, testing the glow plug control module, and scanning the ECM for any related faults.
4. Can I drive my Chevrolet with the P068D code related to Cylinder 7 Glow Plug Control Circuit High Voltage?
It is not recommended to drive the vehicle with this code active, as it can lead to further engine damage and decreased performance.
5. What is the typical repair process for fixing the P068D code in a Chevrolet Cylinder 7 Glow Plug Control Circuit High Voltage?
Repair often involves replacing the faulty glow plug, repairing any damaged wiring or connectors, or replacing the glow plug control module if necessary.
6. Are there any DIY tips for addressing the P068D code in a Chevrolet Cylinder 7 Glow Plug Control Circuit High Voltage?
While basic checks like inspecting wiring connections can be done at home, it's recommended to consult a professional mechanic for a thorough diagnosis and repair.
7. Is the P068D code in a Chevrolet related to Cylinder 7 Glow Plug Control Circuit High Voltage a serious issue?
Yes, this code should be addressed promptly to prevent potential engine damage and ensure optimal vehicle performance.
8. Can resetting the ECM clear the P068D code in a Chevrolet Cylinder 7 Glow Plug Control Circuit High Voltage?
Resetting the ECM may temporarily clear the code, but it will likely reappear if the underlying issue causing the fault is not addressed.
9. How much does it typically cost to repair the P068D code related to Cylinder 7 Glow Plug Control Circuit High Voltage in a Chevrolet?
Costs can vary depending on the exact cause of the issue, but repairs may range from a few hundred to over a thousand dollars, including parts and labor.
10. Are there any recalls or technical service bulletins related to the P068D code in a Chevrolet Cylinder 7 Glow Plug Control Circuit High Voltage?
It's advisable to check with a Chevrolet dealership or online resources for any relevant recalls or technical service bulletins that may apply to your specific vehicle model and year.
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