AutoCodes – Chevrolet – P068D 2014 Chevrolet Silverado

P068D 2014 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 2014 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.

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Code Popularity 339

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 P068D 2014 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 P068D 2014 Chevrolet Silverado - Cylinder 7 Glow Plug Control Circuit High Voltage - AutoCodes.com — P068D 2014 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P068D 2014 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 2014 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 2014 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 P068D 2014 Chevrolet Silverado code?

Need more information on how to fix the P068D 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P068D 2014 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 P068D 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P068D in a 2014 Chevrolet Silverado related to the Cylinder 7 Glow Plug Control Circuit High Voltage issue?

- Common symptoms include rough idling, reduced engine performance, decreased fuel efficiency, and possible illumination of the check engine light.

2. What are the possible causes of OBDII code P068D in a 2014 Chevrolet Silverado indicating a Cylinder 7 Glow Plug Control Circuit High Voltage problem?

- The code may be triggered by a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or issues with the vehicle's ECM.

3. How can I diagnose the Cylinder 7 Glow Plug Control Circuit High Voltage problem in my 2014 Chevrolet Silverado if OBDII code P068D is present?

- A thorough inspection of the glow plug, wiring, connectors, and control module is recommended. Using a multimeter to check for continuity and voltage can help pinpoint the issue.

4. Is it safe to continue driving my 2014 Chevrolet Silverado with OBDII code P068D related to Cylinder 7 Glow Plug Control Circuit High Voltage?

- It is not advisable to drive the vehicle extensively with this issue as it can lead to further damage to the engine and emissions system. Immediate attention and repair are recommended.

5. How can I repair the Cylinder 7 Glow Plug Control Circuit High Voltage problem indicated by OBDII code P068D in my 2014 Chevrolet Silverado?

- Repair procedures may involve replacing the faulty glow plug, repairing damaged wiring or connectors, replacing the glow plug control module, or reprogramming the ECM if necessary.

6. Can a DIY enthusiast fix the Cylinder 7 Glow Plug Control Circuit High Voltage issue causing OBDII code P068D in a 2014 Chevrolet Silverado?

- While some simple tasks like checking connections can be performed by DIY enthusiasts, diagnosing and repairing complex electrical issues may require professional expertise and specialized tools.

7. How much can I expect to pay for repairs related to OBDII code P068D in a 2014 Chevrolet Silverado with a Cylinder 7 Glow Plug Control Circuit High Voltage problem?

- Repair costs can vary depending on the exact cause of the issue and labor rates in your area. It is advisable to obtain quotes from reputable auto repair shops for an accurate estimate.

8. Will resetting the OBDII system clear the P068D code related to Cylinder 7 Glow Plug Control Circuit High Voltage in my 2014 Chevrolet Silverado?

- Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's essential to diagnose and repair the problem to prevent recurrence.

9. Are there any preventive maintenance steps I can take to avoid OBDII code P068D and Cylinder 7 Glow Plug Control Circuit High Voltage issues in my 2014 Chevrolet Silverado?

- Regularly inspecting the glow plug system, ensuring proper maintenance of the vehicle's electrical components, and following the manufacturer's recommended service schedule can help prevent such issues.

10. Can a malfunctioning Cylinder 7 Glow Plug Control Circuit High Voltage cause any long-term damage to my 2014 Chevrolet Silverado if left unrepaired?

- Ignoring the issue can lead to reduced engine performance, increased emissions, and potential damage to other engine components over time. It is crucial to address the problem promptly to prevent further damage.