P0673 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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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Information for Specific Chevrolet Models
- P0673 2014 Chevrolet Silverado — Cylinder 3 Glow Plug Circuit Fault
- P0673 2015 Chevrolet Silverado — Cylinder 3 Glow Plug Circuit Fault
- P0673 2016 Chevrolet Silverado — Cylinder 3 Glow Plug Circuit Fault
- P0673 2017 Chevrolet Silverado — Cylinder 3 Glow Plug Circuit Fault
- P0673 2018 Chevrolet Silverado — Cylinder 3 Glow Plug Circuit Fault
Frequently Asked Questions about P0673 Chevrolet Code
1. What does the OBDII code P0673 mean on a Chevrolet?
P0673 indicates a Cylinder 3 Glow Plug Circuit Fault, meaning the glow plug or its circuit for cylinder 3 is malfunctioning.
2. What are common symptoms of the P0673 code in a Chevrolet?
Symptoms may include difficulty starting the engine in cold weather, rough idling, decreased engine performance, and an illuminated check engine light.
3. What causes the P0673 code to appear?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or corrosion in the electrical connections.
4. How do I diagnose the P0673 code in my Chevrolet?
Diagnose the code by inspecting the glow plug for cylinder 3, checking the wiring and connectors for damage or corrosion, and testing the glow plug control module for proper function.
5. Can I drive my Chevrolet with the P0673 code?
While the vehicle may still be drivable, prolonged operation with this code can lead to hard starts in cold temperatures and potential engine damage over time.
6. How do I fix the P0673 code on a Chevrolet?
Repairs may involve replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module if necessary.
7. How much does it cost to fix the P0673 code on a Chevrolet?
The repair cost varies but typically ranges between $100 and $300, depending on whether you're replacing a glow plug or addressing wiring issues.
8. Can a bad battery cause the P0673 code?
A weak or failing battery can contribute to glow plug circuit faults, as insufficient voltage may prevent the glow plug from functioning correctly.
9. How can I prevent the P0673 code from occurring?
Regularly inspect and maintain the glow plug system, including checking for damaged wiring, cleaning connections, and replacing glow plugs as needed.
10. Do I need to clear the P0673 code after repairs?
Yes, after making the necessary repairs, use an OBDII scanner to clear the code. If the issue is resolved, the check engine light should stay off.
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