P0673 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code
1. What does the OBDII code P0673 mean on a 2017 GMC Sierra?
P0673 indicates a fault in the glow plug circuit for cylinder 3, which helps in cold starting the engine by heating the air in the combustion chamber.
2. What are the common symptoms of code P0673 on a 2017 GMC Sierra?
Symptoms include difficulty starting in cold weather, rough idling, reduced engine performance, and the illumination of the check engine light.
3. What causes the P0673 code in a 2017 GMC Sierra?
Common causes include a faulty glow plug for cylinder 3, damaged wiring or connectors in the glow plug circuit, or a malfunctioning glow plug control module.
4. Can I still drive my 2017 GMC Sierra with a P0673 code?
Yes, but driving with this code can cause poor cold starts and may lead to further engine issues if not addressed promptly.
5. How can I diagnose a P0673 code on my 2017 GMC Sierra?
Start by inspecting the glow plug, wiring, and connectors for cylinder 3. Use a multimeter to check for continuity in the glow plug and test the circuit for proper voltage.
6. How do I fix the P0673 code on a 2017 GMC Sierra?
Repairs may include replacing the faulty glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module if it’s malfunctioning.
7. How much does it cost to repair the P0673 code on a 2017 GMC Sierra?
Repair costs can range from $100 to $300, depending on whether you need to replace a glow plug, repair wiring, or replace the glow plug control module.
8. Can a bad glow plug cause long-term damage to my 2017 GMC Sierra?
If left unaddressed, a bad glow plug can lead to poor engine performance, increased emissions, and difficulty starting, especially in cold weather.
9. How can I prevent the P0673 code from recurring on my 2017 GMC Sierra?
Regularly inspect the glow plugs, wiring, and connectors for damage, and replace the glow plugs at recommended intervals to ensure proper operation.
10. Does the P0673 code affect fuel economy on a 2017 GMC Sierra?
Yes, a faulty glow plug can lead to incomplete combustion, which may slightly reduce fuel efficiency and increase emissions.
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