P0674 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 P0674 2017 Chevrolet Silverado code?
Need more information on how to fix the P0674 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0674 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0674 2017 Chevrolet Silverado Code
1. What does the OBDII code P0674 mean on a 2017 Chevrolet Silverado?
P0674 indicates a fault in the glow plug circuit for cylinder 4, meaning the system has detected an issue with the operation or performance of the glow plug in that specific cylinder.
2. What are the symptoms of a P0674 code in a 2017 Chevrolet Silverado?
Common symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and an illuminated Check Engine Light.
3. What causes the P0674 code in a Chevrolet Silverado?
The code can be caused by a faulty glow plug, damaged glow plug wiring or connectors, a failed glow plug control module, or corrosion in the circuit.
4. Can I drive my 2017 Chevrolet Silverado with a P0674 code?
While you can drive with this code, it is not recommended, especially in cold weather, as the engine may struggle to start and run efficiently.
5. How do I diagnose the P0674 code?
Diagnose by using a multimeter to test the resistance of the cylinder 4 glow plug, inspecting the wiring and connectors for damage or corrosion, and testing the glow plug control module for proper operation.
6. How do I fix the P0674 code on a 2017 Chevrolet Silverado?
Repairs may include replacing the faulty cylinder 4 glow plug, repairing or replacing damaged wiring or connectors, or replacing the glow plug control module if it is defective.
7. How much does it cost to repair a P0674 code?
The cost varies, but replacing a single glow plug typically costs $50–$150, while more extensive repairs like wiring or control module replacement may cost $200–$500 or more.
8. Can a P0674 code cause long-term damage to my Silverado?
If left unresolved, it can lead to harder starts, increased emissions, and potential damage to the engine or other components due to improper combustion.
9. What tools are needed to fix a P0674 code?
You'll need an OBDII scanner to confirm the code, a multimeter to test electrical components, and basic hand tools to replace the glow plug or repair wiring.
10. How can I prevent the P0674 code from occurring again?
Regular maintenance, including inspecting and cleaning glow plug connections and replacing glow plugs at recommended intervals, can help prevent this issue.
Discuss the causes and fixes for P0674 2017 Chevrolet Silverado OBDII Code
Code P0674 2017 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
