P0674 2015 Chevrolet Silverado Code - Cylinder 4 Glow Plug Circuit Fault
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 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
- P0674 2015 Chevrolet Silverado indicates Cylinder 4 Glow Plug Circuit Fault.
- Common causes
- Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 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 P0674 2015 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 P0674 2015 Chevrolet Silverado?
- Faulty cylinder #4 glow plug
- Cylinder #4 glow plug harness is open or shorted
- Cylinder #4 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module (GPCM)
How to Fix the DTC P0674 2015 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 P0674 2015 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 P0674 2015 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code P0674 on a 2015 Chevrolet Silverado related to the Cylinder 4 Glow Plug Circuit Fault?
The common symptoms include rough engine idling, difficulty starting the vehicle, reduced engine performance, and potentially increased fuel consumption.
2. What are the possible causes of the Cylinder 4 Glow Plug Circuit Fault in a 2015 Chevrolet Silverado triggering OBDII code P0674?
Potential causes include a faulty glow plug in cylinder 4, damaged wiring or connectors in the glow plug circuit, a defective glow plug control module, or issues with the vehicle's PCM (powertrain control module).
3. How can I diagnose the Cylinder 4 Glow Plug Circuit Fault causing OBDII code P0674 in my 2015 Chevrolet Silverado?
To diagnose the issue, you can use a diagnostic scanner to retrieve the specific trouble code, visually inspect the glow plug and its wiring for damage, test the glow plug for continuity, and check the glow plug control module for proper operation.
4. Is it safe to continue driving my 2015 Chevrolet Silverado with OBDII code P0674 related to the Cylinder 4 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 to other engine components, and even engine misfires. It's best to address the issue promptly.
5. Can I repair the Cylinder 4 Glow Plug Circuit Fault triggering OBDII code P0674 in my 2015 Chevrolet Silverado myself?
Depending on your mechanical skills and tools, you may be able to replace the faulty glow plug or repair damaged wiring yourself. However, diagnosing and fixing issues with the glow plug control module or PCM may require professional help.
6. How much does it typically cost to repair the Cylinder 4 Glow Plug Circuit Fault causing OBDII code P0674 in a 2015 Chevrolet Silverado?
The cost of repair can vary widely depending on the exact cause of the fault, labor rates in your area, and whether you choose to use OEM or aftermarket parts. Repairs for glow plug issues can range from $100 to $500 or more.
7. Are there any preventive maintenance tips to avoid encountering OBDII code P0674 related to the Cylinder 4 Glow Plug Circuit Fault in my 2015 Chevrolet Silverado?
To prevent glow plug circuit faults, it's advisable to follow the manufacturer's recommended maintenance schedule, avoid using poor quality fuel, and address any engine performance issues promptly to prevent excessive strain on the glow plug system.
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