P0676 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado Code
1. What does OBDII code P0676 mean on a 2016 Chevrolet Silverado?
P0676 indicates a Cylinder 6 Glow Plug Circuit Fault, meaning there is an issue in the electrical circuit or operation of the glow plug for cylinder 6.
2. What are the common symptoms of code P0676 in a 2016 Chevrolet Silverado?
Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and the check engine light being illuminated.
3. What causes the P0676 code to appear in a 2016 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 circuit.
4. How can I diagnose the P0676 code on my 2016 Chevrolet Silverado?
Use a multimeter to test the resistance of the glow plug for cylinder 6, inspect the wiring and connectors for damage or corrosion, and check the glow plug control module for proper operation.
5. Can I drive my 2016 Chevrolet Silverado with the P0676 code active?
While the truck may still run, driving with this code can lead to hard starts and potential long-term damage to the engine, especially in cold weather, so it’s best to address the issue promptly.
6. How do I fix the P0676 code on my 2016 Chevrolet Silverado?
Common fixes include replacing the faulty glow plug for cylinder 6, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module if necessary.
7. How much does it cost to fix the P0676 code on a 2016 Chevrolet Silverado?
The cost typically ranges from $50 to $150 for a new glow plug plus labor. If wiring repairs or module replacement are needed, the cost may increase.
8. Can a bad glow plug cause engine damage in a 2016 Chevrolet Silverado?
A single bad glow plug typically won’t cause immediate engine damage but can lead to poor engine performance, harder starts, and additional stress on the engine over time.
9. How do I prevent the P0676 code from recurring in my 2016 Chevrolet Silverado?
Regularly inspect and maintain the glow plug system, ensuring connections are clean and tight, and replace glow plugs as part of routine maintenance if they show signs of wear.
10. Does cold weather increase the likelihood of the P0676 code in a 2016 Chevrolet Silverado?
Yes, cold weather can exacerbate issues with the glow plug system, as glow plugs are essential for starting diesel engines in low temperatures.
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