P0676 2017 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 2017 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.
Code P0676 2017 Chevrolet Silverado 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 P0676 2017 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 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 P0676 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.
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Frequently Asked Questions about P0676 2017 Chevrolet Silverado Code
1. What does code P0676 mean on a 2017 Chevrolet Silverado?
P0676 indicates a malfunction in the glow plug circuit for cylinder 6, which helps preheat the air in the cylinder for combustion in diesel engines.
2. What are the common symptoms of code P0676?
Common symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and the check engine light being illuminated.
3. What causes code P0676 on a Chevrolet Silverado?
The most common causes are a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a bad glow plug control module, or corrosion in the electrical connections.
4. Can I drive my 2017 Silverado with a P0676 code?
Yes, you can drive the vehicle, but it may have trouble starting in cold weather and could experience reduced performance. It's best to address the issue promptly to avoid further damage.
5. How do I diagnose a P0676 code?
Start by inspecting the glow plug for cylinder 6, checking for damage or wear. Then, test the wiring and connectors for continuity and look for signs of corrosion or disconnection.
6. How do I fix the P0676 code on my Silverado?
Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the glow plug control module if necessary.
7. How much does it cost to repair a P0676 code?
The cost varies but typically ranges from $100 to $300, depending on whether you need to replace the glow plug, repair wiring, or replace the control module.
8. Can a bad glow plug cause engine damage in my Silverado?
A bad glow plug itself won't cause engine damage, but prolonged starting issues or incomplete combustion can lead to other engine problems over time.
9. What tools are needed to fix a P0676 code?
Common tools include a digital multimeter for testing electrical continuity, a socket set for removing the glow plug, and possibly a scan tool to clear the code after repairs.
10. How do I prevent a P0676 code from recurring?
Regular maintenance, such as inspecting and replacing glow plugs as needed, checking the glow plug circuit wiring, and addressing corrosion promptly, can help prevent this code.
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