AutoCodes – Chevrolet – P0676 Chevrolet

P0676 Chevrolet 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 Chevrolet 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 1,243

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
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0676 Chevrolet 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 Chevrolet - Cylinder 6 Glow Plug Circuit Fault - AutoCodes.com — P0676 Chevrolet Code - Cylinder 6 Glow Plug Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P0676 Chevrolet?

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 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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

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

Need Help with the Code?

Get the P0676 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P0676 2014 Chevrolet Silverado — Cylinder 6 Glow Plug Circuit Fault
P0676 2015 Chevrolet Silverado — Cylinder 6 Glow Plug Circuit Fault
P0676 2016 Chevrolet Silverado — Cylinder 6 Glow Plug Circuit Fault
P0676 2017 Chevrolet Silverado — Cylinder 6 Glow Plug Circuit Fault
P0676 2018 Chevrolet Silverado — Cylinder 6 Glow Plug Circuit Fault

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 Chevrolet Code

1. What are the common symptoms of OBDII code P0676 in a Chevrolet related to the Cylinder 6 Glow Plug Circuit Fault?

- Common symptoms include rough idling, misfiring, difficulty starting the engine, reduced fuel efficiency, and illuminated Check Engine Light.

2. What are the possible causes of the Cylinder 6 Glow Plug Circuit Fault (P0676) in a Chevrolet?

- Potential causes include a faulty glow plug in cylinder 6, wiring issues in the glow plug circuit, a malfunctioning glow plug control module, or a problem with the engine control module (ECM).

3. How can I diagnose the Cylinder 6 Glow Plug Circuit Fault in my Chevrolet if I suspect OBDII code P0676?

- Diagnose by inspecting the glow plug in cylinder 6 for damage, testing the glow plug circuit for continuity, checking the glow plug control module for proper functioning, and scanning the ECM for related error codes.

4. Can I continue driving my Chevrolet with OBDII code P0676 related to the Cylinder 6 Glow Plug Circuit Fault?

- It is not recommended to drive the vehicle with this fault as it can lead to poor engine performance, potential damage, and increased emissions. It's best to address the issue promptly.

5. How can I repair the Cylinder 6 Glow Plug Circuit Fault in my Chevrolet with OBDII code P0676?

- Repair involves replacing the faulty glow plug in cylinder 6, repairing any damaged wiring in the circuit, replacing the glow plug control module if necessary, and clearing the error code with a diagnostic tool.

6. Are there any preventive maintenance tips to avoid encountering OBDII code P0676 in a Chevrolet?

- Regularly inspecting and testing the glow plugs, maintaining the glow plug circuitry, and following the manufacturer's recommended maintenance schedule can help prevent issues related to this fault.

7. Can extreme weather conditions impact the Cylinder 6 Glow Plug Circuit Fault in a Chevrolet triggering OBDII code P0676?

- Yes, extreme cold temperatures can exacerbate glow plug issues, leading to faults in the cylinder 6 circuit. It's essential to ensure the glow plug system is functioning correctly, especially in cold climates.

8. Is it possible for a DIY enthusiast to replace the glow plug in cylinder 6 to address OBDII code P0676 in a Chevrolet?

- While replacing a glow plug is typically a straightforward task, it requires basic mechanical skills and knowledge of the vehicle's engine layout. If unsure, it's advisable to seek professional assistance.

9. How long does it usually take to repair the Cylinder 6 Glow Plug Circuit Fault causing OBDII code P0676 in a Chevrolet?

- The repair time can vary depending on the extent of the issue and the availability of parts. On average, addressing this fault may take a few hours to a day, including diagnosis and repair.

10. Will resetting the Check Engine Light after repairing the Cylinder 6 Glow Plug Circuit Fault (P0676) in a Chevrolet prevent the code from reoccurring?

- Resetting the light is a crucial step after repairing the fault, but it does not guarantee that the code won't reappear. It's essential to ensure the underlying issue is fully addressed to prevent future occurrences.