AutoCodes – Chevrolet – P068C 2017 Chevrolet Silverado

P068C 2017 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit Low 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: P068C 2017 Chevrolet Silverado indicates Cylinder 7 Glow Plug Control Circuit Low 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.

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Code Popularity 333

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P068C 2017 Chevrolet Silverado Description

n the diesel engine, air alone is compressed in the cylinder. Then, after the air has been compressed, a charge of fuel is sprayed into the cylinder and ignition occurs, due to the heat of compression. Eight glow plugs are used as an aid to starting.
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.

OBDII Code P068C 2017 Chevrolet Silverado - Cylinder 7 Glow Plug Control Circuit Low Voltage - AutoCodes.com — P068C 2017 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P068C 2017 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 P068C 2017 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 P068C 2017 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.

Need more information about the P068C 2017 Chevrolet Silverado code?

Need more information on how to fix the P068C 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P068C 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P068C 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P068C in a 2017 Chevrolet Silverado?

The common symptoms of OBDII code P068C, Cylinder 7 Glow Plug Control Circuit Low Voltage in a 2017 Chevrolet Silverado, may include rough idling, decreased engine performance, and the illumination of the check engine light.

2. What can cause the OBDII code P068C to trigger in a 2017 Chevrolet Silverado?

The OBDII code P068C in a 2017 Chevrolet Silverado is typically triggered by issues such as a faulty glow plug, damaged wiring in the glow plug circuit, or a malfunctioning glow plug control module.

3. How can I diagnose the Cylinder 7 Glow Plug Control Circuit Low Voltage issue in my 2017 Chevrolet Silverado?

To diagnose the Cylinder 7 Glow Plug Control Circuit Low Voltage issue in a 2017 Chevrolet Silverado, you can use an OBDII scanner to retrieve the specific fault code, visually inspect the glow plug and its wiring, and test the glow plug control module for proper functionality.

4. What are the possible repair options for the OBDII code P068C in a 2017 Chevrolet Silverado?

Repair options for the OBDII code P068C in a 2017 Chevrolet Silverado may include replacing the faulty glow plug, repairing or replacing damaged wiring in the glow plug circuit, or replacing the defective glow plug control module.

5. Can I continue driving my 2017 Chevrolet Silverado with the OBDII code P068C illuminated?

It is not recommended to continue driving your 2017 Chevrolet Silverado with the OBDII code P068C illuminated, as it can lead to further engine damage and decreased performance. It is advised to address the issue promptly.

6. Will resetting the check engine light resolve the OBDII code P068C issue in my 2017 Chevrolet Silverado?

Resetting the check engine light may temporarily turn off the warning indicator, but it will not fix the underlying problem causing the OBDII code P068C in a 2017 Chevrolet Silverado. Proper diagnostics and repair are necessary.

7. What role do glow plugs play in the operation of a 2017 Chevrolet Silverado?

Glow plugs in a 2017 Chevrolet Silverado are essential for aiding in cold start-ups by preheating the air in the combustion chamber. They ensure efficient ignition and combustion of the diesel fuel in the engine.

8. How can I prevent the recurrence of the OBDII code P068C in my 2017 Chevrolet Silverado?

To prevent the recurrence of the OBDII code P068C in a 2017 Chevrolet Silverado, it is essential to perform regular maintenance checks on the glow plugs, wiring, and control module. Additionally, using high-quality diesel fuel can help maintain proper engine performance.

9. Are there any safety precautions to consider when working on the glow plug system of a 2017 Chevrolet Silverado?

When working on the glow plug system of a 2017 Chevrolet Silverado, it is important to disconnect the battery, allow the engine to cool down, and follow proper safety procedures to prevent any electrical hazards or injuries.

10. How long does it typically take to repair the Cylinder 7 Glow Plug Control Circuit Low Voltage issue in a 2017 Chevrolet Silverado?

The repair time for the Cylinder 7 Glow Plug Control Circuit Low Voltage issue in a 2017 Chevrolet Silverado can vary depending on the exact cause of the problem and the extent of the repairs needed. It may range from a few hours to a full day in some cases.