P06C9 2014 GMC Sierra Code - Cylinder 5 Glow Plug Incorrect
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 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
- P06C9 2014 GMC Sierra indicates Cylinder 5 Glow Plug Incorrect.
- Common causes
- Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 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 P06C9 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. A Diagnostic Trouble Code (DTC) will be set if the Glow Plug resistance is not within a calibrated range.
What are the Possible Causes of the DTC P06C9 2014 GMC Sierra?
- Faulty cylinder #1 glow plug
- Cylinder #1 glow plug harness is open or shorted
- Cylinder #1 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P06C9 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 P06C9 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 P06C9 2014 GMC Sierra Code
1. What does the OBDII code P06C9 mean for a 2014 GMC Sierra?
The P06C9 code indicates "Cylinder 5 Glow Plug Incorrect," meaning there’s an issue with the glow plug circuit or operation for cylinder 5.
2. What are the common symptoms of the P06C9 code?
Symptoms may include difficulty starting the engine, especially in cold weather, rough idling, reduced fuel efficiency, or the Check Engine Light turning on.
3. What causes the P06C9 code to appear on a 2014 GMC Sierra?
The code can be caused by 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. Can I drive my 2014 GMC Sierra with the P06C9 code?
While the truck may still drive, ignoring the issue can lead to harder cold starts, reduced engine performance, and potential long-term damage. It’s best to address the problem promptly.
5. How do I diagnose the P06C9 code on a 2014 GMC Sierra?
Start by checking the glow plug for cylinder 5, 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 P06C9 code on my GMC Sierra?
Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, cleaning corroded connections, or replacing the glow plug control module if necessary.
7. How much does it cost to fix the P06C9 code on a 2014 GMC Sierra?
The repair cost varies but typically ranges from $100 to $300 for parts and labor, depending on whether the glow plug, wiring, or control module needs replacement.
8. Can bad fuel cause the P06C9 code?
While bad fuel isn’t a direct cause, poor-quality diesel can strain the glow plugs and lead to performance issues, which may exacerbate existing problems.
9. Does cold weather make the P06C9 code worse?
Yes, since glow plugs are essential for starting a diesel engine in cold weather, a faulty glow plug in cylinder 5 can make starting more difficult in lower temperatures.
10. Do I need to replace all the glow plugs if I get the P06C9 code?
Not necessarily. If only the glow plug for cylinder 5 is faulty, you can replace just that one. However, if other plugs show signs of wear, it might be wise to replace them all as preventative maintenance.
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