P0673 2014 GMC Sierra Code - Cylinder 3 Glow Plug Circuit Fault
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #3 glow plug, Cylinder #3 glow plug harness is open or shorted, Cylinder #3 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
- P0673 2014 GMC Sierra indicates Cylinder 3 Glow Plug Circuit Fault.
- Common causes
- Common causes include Faulty cylinder #3 glow plug, Cylinder #3 glow plug harness is open or shorted, Cylinder #3 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 P0673 2014 GMC Sierra 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 P0673 2014 GMC Sierra?
- Faulty cylinder #3 glow plug
- Cylinder #3 glow plug harness is open or shorted
- Cylinder #3 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module (GPCM)
How to Fix the DTC P0673 2014 GMC Sierra?
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 P0673 2014 GMC Sierra 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 P0673 2014 GMC Sierra Code
1. What are the common symptoms of OBDII code P0673 in a 2014 GMC Sierra related to the Cylinder 3 Glow Plug Circuit Fault?
The common symptoms include rough idling, decreased engine performance, difficulty starting the engine, and the illumination of the Check Engine Light.
2. What are the possible causes of OBDII code P0673 in a 2014 GMC Sierra indicating a Cylinder 3 Glow Plug Circuit Fault?
The possible causes include a faulty glow plug in cylinder 3, damaged wiring or connectors in the glow plug circuit, or issues with the glow plug control module.
3. How can I diagnose the Cylinder 3 Glow Plug Circuit Fault in my 2014 GMC Sierra with OBDII code P0673?
You can diagnose the issue by using a scan tool to read the OBDII trouble code, visually inspecting the glow plug in cylinder 3, checking the wiring and connectors for damage, and testing the glow plug control module.
4. Can I still drive my 2014 GMC Sierra with OBDII code P0673 indicating a Cylinder 3 Glow Plug Circuit Fault?
It is not recommended to drive the vehicle with this fault as it can lead to poor engine performance and potential damage. It is best to address the issue promptly.
5. How do I repair the Cylinder 3 Glow Plug Circuit Fault in my 2014 GMC Sierra triggering OBDII code P0673?
To repair the fault, you may need to replace the glow plug in cylinder 3, repair or replace any damaged wiring or connectors, or replace the glow plug control module if necessary.
6. Are there any preventive measures to avoid the Cylinder 3 Glow Plug Circuit Fault in a 2014 GMC Sierra?
Regular maintenance checks, such as inspecting and testing the glow plugs, wiring, and connectors, can help prevent issues with the glow plug circuit and potentially avoid triggering OBDII code P0673.
7. How much does it typically cost to repair the Cylinder 3 Glow Plug Circuit Fault in a 2014 GMC Sierra with OBDII code P0673?
The cost of repair can vary depending on the extent of the issue and whether you choose to do the repairs yourself or take the vehicle to a mechanic. Costs may include parts and labor.
8. Can a faulty glow plug in cylinder 3 cause other problems in a 2014 GMC Sierra besides triggering OBDII code P0673?
Yes, a faulty glow plug in cylinder 3 can lead to incomplete combustion, reduced fuel efficiency, increased emissions, and potential damage to the engine over time if left unrepaired.
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