P0676 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?
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Frequently Asked Questions about P0676 2018 Chevrolet Silverado Code
1. What does the OBDII code P0676 mean for a 2018 Chevrolet Silverado?
P0676 indicates a fault in the glow plug circuit for cylinder 6, meaning the circuit is malfunctioning or the glow plug is not working as intended.
2. What are the symptoms of a P0676 code in a 2018 Chevrolet Silverado?
Symptoms may include difficulty starting in cold weather, rough idling, reduced engine performance, and the check engine light being illuminated.
3. What causes the P0676 code to appear on a 2018 Chevrolet Silverado?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or corrosion in the electrical system.
4. Can I drive my 2018 Chevrolet Silverado with a P0676 code?
While the vehicle may still be drivable, prolonged use with this code could lead to harder starts and increased stress on the engine, especially in cold weather.
5. How is the P0676 code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the glow plug circuit wiring and connectors, and test the glow plug and control module for proper functionality.
6. How do I fix the P0676 code on a 2018 Chevrolet Silverado?
Repairs may involve replacing the faulty glow plug, repairing damaged wiring or connectors, cleaning corrosion, or replacing the glow plug control module if necessary.
7. How much does it cost to fix a P0676 code on a 2018 Chevrolet Silverado?
Repair costs can range from $100 to $300, depending on whether the glow plug, wiring, or control module needs replacement.
8. Can a faulty glow plug cause long-term damage if not fixed?
Yes, a faulty glow plug can lead to harder starts and increased engine wear, particularly in colder climates, if not addressed promptly.
9. What tools are needed to troubleshoot a P0676 code?
Basic tools include an OBDII scanner, a multimeter for testing electrical circuits, and possibly a socket set to remove the glow plug.
10. Is the P0676 code specific to cylinder 6 on my Silverado?
Yes, the P0676 code specifically identifies an issue with the glow plug circuit for cylinder 6. Other cylinders have their own unique codes for similar faults.
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