P0674 2014 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 2014 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 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 P0674 2014 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 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 P0674 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 P0674 2014 Chevrolet Silverado Code
1. What does the OBDII code P0674 mean for a 2014 Chevrolet Silverado?
P0674 indicates a fault in the glow plug circuit for cylinder 4, meaning the glow plug or its wiring may not be functioning properly.
2. What are the symptoms of code P0674 on a 2014 Chevrolet Silverado?
Symptoms may include difficulty starting the engine in cold weather, rough idling, decreased fuel efficiency, or an illuminated check engine light.
3. What causes the P0674 code in a 2014 Chevrolet Silverado?
Common causes include a faulty glow plug, damaged glow plug wiring, a defective glow plug control module, or corroded electrical connections.
4. How do you diagnose the P0674 code on a 2014 Chevrolet Silverado?
A mechanic will typically use a scan tool to confirm the code, inspect the glow plug and wiring for damage, and test the glow plug resistance and control module functionality.
5. Can you drive with the P0674 code on a 2014 Chevrolet Silverado?
While the truck may still be drivable, ignoring the issue could lead to harder cold starts and potential further damage to the glow plug system.
6. How do you fix the P0674 code on a 2014 Chevrolet Silverado?
Repairs may include replacing the faulty glow plug, repairing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module.
7. How much does it cost to fix the P0674 code on a 2014 Chevrolet Silverado?
Repair costs vary, but replacing a glow plug typically ranges from $50 to $150 for parts and labor, while control module repairs may be more expensive.
8. What tools are needed to fix the P0674 code on a 2014 Chevrolet Silverado?
Basic tools include a digital multimeter to test resistance, a socket set for glow plug removal, and possibly a scan tool for diagnostics.
9. How can you prevent the P0674 code from reoccurring on a 2014 Chevrolet Silverado?
Regular maintenance, such as inspecting the glow plug system and keeping electrical connections clean, can help prevent this code from reappearing.
10. Is the P0674 code specific to cylinder 4 on a 2014 Chevrolet Silverado?
Yes, the code specifically identifies a fault in the glow plug circuit for cylinder 4. Other cylinders would trigger different P067X codes.
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