AutoCodes – Chevrolet – P0676 2015 Chevrolet Silverado

P0676 2015 Chevrolet Silverado Code - Cylinder 6 Glow Plug Circuit Fault

Quick Answer

n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #6 glow plug, Cylinder #6 glow plug harness is open or shorted, Cylinder #6 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: P0676 2015 Chevrolet Silverado indicates Cylinder 6 Glow Plug Circuit Fault.
Common causes: Common causes include Faulty cylinder #6 glow plug, Cylinder #6 glow plug harness is open or shorted, Cylinder #6 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 237

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 P0676 2015 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 P0676 2015 Chevrolet Silverado - Cylinder 6 Glow Plug Circuit Fault - AutoCodes.com — P0676 2015 Chevrolet Silverado Code - Cylinder 6 Glow Plug Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P0676 2015 Chevrolet Silverado?

Faulty cylinder #6 glow plug
Cylinder #6 glow plug harness is open or shorted
Cylinder #6 glow plug circuit poor electrical connection
Faulty Glow Plug Control Module (GPCM)

How to Fix the DTC P0676 2015 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 P0676 2015 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 P0676 2015 Chevrolet Silverado code?

Need more information on how to fix the P0676 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0676 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0676 in a 2015 Chevrolet Silverado?

The common symptoms of code P0676, indicating a Cylinder 6 Glow Plug Circuit Fault, include rough idling, difficulty starting the engine, and potential loss of power.

2. What are the possible causes of OBDII code P0676 in a 2015 Chevrolet Silverado?

The potential causes of code P0676 on a 2015 Chevrolet Silverado can include a faulty glow plug in cylinder 6, damaged wiring in the glow plug circuit, or a malfunctioning glow plug control module.

3. How can I diagnose OBDII code P0676 in my 2015 Chevrolet Silverado?

Diagnosing code P0676 involves using an OBDII scanner to read the fault code, visually inspecting the glow plug in cylinder 6, checking the wiring for any damage, and testing the glow plug control module for proper functioning.

4. Can I still drive my 2015 Chevrolet Silverado with OBDII code P0676?

It is not recommended to drive your vehicle with code P0676 unresolved, as it can lead to engine performance issues and potential damage if left unattended.

5. How can I repair OBDII code P0676 in a 2015 Chevrolet Silverado?

To repair code P0676, you may need to replace the glow plug in cylinder 6, repair any damaged wiring in the glow plug circuit, or replace the glow plug control module if necessary.

6. Are there any DIY repair tips for fixing OBDII code P0676 in a 2015 Chevrolet Silverado?

While some basic inspections can be done DIY, it is recommended to consult a professional mechanic for proper diagnosis and repair of code P0676 to ensure the issue is resolved correctly.

7. What is the typical cost to repair OBDII code P0676 in a 2015 Chevrolet Silverado?

The cost to repair code P0676 can vary depending on the exact cause of the issue, but it may involve parts and labor expenses for replacing the glow plug, repairing wiring, or replacing the control module.

8. How can I prevent OBDII code P0676 from appearing in my 2015 Chevrolet Silverado in the future?

Regular maintenance, such as checking and replacing glow plugs as needed, inspecting wiring for damage, and monitoring the glow plug control module, can help prevent code P0676 from occurring in the future.

9. Can a faulty glow plug in cylinder 6 cause other issues in a 2015 Chevrolet Silverado?

Yes, a faulty glow plug in cylinder 6 can lead to issues like hard starting, rough idling, decreased fuel efficiency, and potential damage to the engine if not addressed promptly.

10. Is it safe to continue driving my 2015 Chevrolet Silverado if code P0676 is intermittent?

While intermittent codes can sometimes be less severe, it is still recommended to address the underlying issue causing code P0676 to prevent potential long-term damage to the engine or other components.