P0676 2014 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 2014 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 2014 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 2014 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 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 P0676 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.
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Frequently Asked Questions about P0676 2014 Chevrolet Silverado Code
1. What does the OBDII code P0676 mean on a 2014 Chevrolet Silverado?
P0676 indicates a fault in the glow plug circuit for cylinder 6, meaning the glow plug may not be functioning properly.
2. What are the symptoms of a P0676 code?
Common symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, or an illuminated Check Engine Light.
3. What causes the P0676 code to appear?
Possible causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or corrosion in electrical connections.
4. Can I drive my 2014 Chevrolet Silverado with a P0676 code?
Yes, you can drive the truck, but starting issues, especially in cold weather, may worsen. It’s best to address the issue promptly to avoid further complications.
5. How do I diagnose a P0676 code?
Start by visually inspecting the glow plug, its wiring, and connectors for damage or corrosion. Test the glow plug's resistance using a multimeter, and check for proper voltage at the circuit.
6. What is the most common fix for a P0676 code?
The most common fix is replacing the faulty glow plug on cylinder 6. If wiring or connectors are damaged, repairing or replacing them may also resolve the issue.
7. How much does it cost to fix a P0676 code?
Replacing a glow plug typically costs $50–$150 for parts and labor, but costs may vary depending on the shop and location.
8. Can a bad glow plug damage my engine?
A bad glow plug itself won’t directly damage the engine, but prolonged issues may lead to poor combustion, increased emissions, or starting problems that can strain other components.
9. How do I prevent the P0676 code from recurring?
Regularly inspect and maintain the glow plug system, ensure connections are clean and free of corrosion, and replace glow plugs as recommended by the manufacturer.
10. Is the P0676 code related to cold weather?
Yes, the glow plug system is especially important for starting in cold weather. A fault in cylinder 6’s glow plug circuit can cause harder starts in colder temperatures.
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