P0673 GMC Code - Cylinder 3 Glow Plug Circuit Fault
Quick Answer
The P0673 diagnostic trouble code (DTC) for GMC vehicles specifically points to a Cylinder 3 Glow Plug Circuit Fault. Common causes include Faulty glow plug in cylinder 3, Damaged wiring or connectors in the glow plug circuit, Faulty glow plug control module. 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 GMC indicates Cylinder 3 Glow Plug Circuit Fault.
- Common causes
- Common causes include Faulty glow plug in cylinder 3, Damaged wiring or connectors in the glow plug circuit, Faulty glow plug control module.
- 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.
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Code P0673 GMC Description
The P0673 diagnostic trouble code (DTC) for GMC vehicles specifically points to a Cylinder 3 Glow Plug Circuit Fault. Glow plugs are essential components in diesel engines, particularly in colder climates, as they help heat up the combustion chamber for easier engine starting. In this case, the code indicates that there is a fault in the circuit related to the glow plug in cylinder 3.
Common Causes of P0673 GMC
- Faulty glow plug in cylinder 3
- Damaged wiring or connectors in the glow plug circuit
- Faulty glow plug control module
- Corrosion or poor connection in the circuit
- Electrical issues such as a blown fuse or relay related to the glow plug circuit
Symptoms of P0673 GMC
- Difficulty starting the engine, especially in cold weather
- Rough idling or engine misfires
- Decreased engine performance and power
- Increased exhaust emissions
- Engine stalling or hesitation during acceleration
How to Fix P0673 GMC
- Begin by diagnosing the exact cause of the fault using a scan tool to read the DTC and pinpoint the issue.
- Inspect the glow plug in cylinder 3 for any signs of damage or wear and replace if necessary.
- Check the wiring and connectors in the glow plug circuit for any damage, corrosion, or poor connections. Repair or replace as needed.
- Test the glow plug control module to ensure it is functioning correctly. Replace if found to be faulty.
- Clear the DTC from the vehicle's memory using a scan tool after completing the repairs and test the vehicle to ensure the issue has been resolved.
Cost to Fix P0673 GMC
The cost of repairing a Cylinder 3 Glow Plug Circuit Fault can vary depending on the exact cause of the issue and the specific components that need to be replaced. On average, the cost of parts for this repair can range from $50 to $150, while the labor cost may be between $100 and $200. Overall, the total repair cost can range from $150 to $350. However, it is important to note that labor rates and parts prices can vary based on location, vehicle make and model, and other factors. It is recommended to obtain quotes from several auto repair shops to get a more accurate estimate for this repair.
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Information for Specific GMC Models
- P0673 2014 GMC Sierra — Cylinder 3 Glow Plug Circuit Fault
- P0673 2015 GMC Sierra — Cylinder 3 Glow Plug Circuit Fault
- P0673 2016 GMC Sierra — Cylinder 3 Glow Plug Circuit Fault
- P0673 2017 GMC Sierra — Cylinder 3 Glow Plug Circuit Fault
- P0673 2018 GMC Sierra — Cylinder 3 Glow Plug Circuit Fault
Frequently Asked Questions about P0673 GMC Code
1. What does the OBDII code P0673 mean on a GMC vehicle?
P0673 indicates a fault in the glow plug circuit for cylinder 3, which may affect the engine's ability to start in cold conditions.
2. What are the common symptoms of code P0673?
Common symptoms include difficulty starting the engine in cold weather, rough idle, reduced fuel efficiency, and the check engine light illuminating.
3. What causes a P0673 code to appear?
The code can be triggered by a faulty glow plug, damaged glow plug wiring, a bad glow plug control module, or a poor electrical connection in the circuit.
4. Can I drive my GMC with a P0673 code?
While the vehicle may still be drivable, starting difficulties and reduced performance in cold weather could occur. It's best to address the issue promptly to avoid further damage.
5. How do I diagnose a P0673 code?
Use a multimeter to check the resistance of the cylinder 3 glow plug, inspect the wiring and connectors for damage, and test the glow plug control module for proper operation.
6. How do I fix the P0673 code on my GMC?
Repairs may include replacing the faulty glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module if it's defective.
7. How much does it cost to fix a P0673 code?
The cost depends on the exact issue. Replacing a glow plug typically costs $50–$150, while addressing wiring or control module issues may cost more.
8. Can a bad glow plug cause other problems in my GMC?
Yes, a bad glow plug can lead to poor engine performance, difficulty starting, and potential damage to other engine components if left unresolved.
9. How can I prevent a P0673 code from recurring?
Regular maintenance, including inspecting the glow plug system and addressing issues promptly, can help prevent the code from recurring.
10. Does the P0673 code affect all GMC vehicles the same way?
The impact may vary depending on the model and engine type, but the code generally indicates the same issue with the cylinder 3 glow plug circuit.
Discuss the causes and fixes for P0673 GMC OBDII Code
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I changed the #3 glow plug and cleared the code, next day engine light was back on, now I’m thinking about changing the ECM, don’t know if I’m going the right route or not but all that would be left is changing the harness, I hope I’m right
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