P06C9 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code
What does OBDII code P06C9 mean on a 2016 GMC Sierra?
Code P06C9 indicates Cylinder 5 Glow Plug Incorrect, meaning the glow plug or its circuit for cylinder 5 is not functioning properly.
What are the common symptoms of code P06C9?
Symptoms may include difficulty starting the engine in cold weather, rough idle, reduced fuel efficiency, and the check engine light being illuminated.
What causes the P06C9 code to appear?
Common causes include a faulty glow plug for cylinder 5, damaged glow plug wiring or connectors, issues with the glow plug control module, or corrosion in the electrical circuit.
Can I drive my 2016 GMC Sierra with the P06C9 code?
Driving with this code is possible, but it may lead to hard starting in cold weather and reduced engine performance. Prompt repairs are recommended to avoid further issues.
How do I diagnose the P06C9 code?
Diagnosis typically involves inspecting the cylinder 5 glow plug, checking the wiring and connectors for damage or corrosion, and testing the glow plug control module for proper operation.
How do I fix the P06C9 code?
Repairs may include replacing the faulty glow plug for cylinder 5, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module if necessary.
What tools are needed to fix code P06C9?
You'll need a diagnostic scanner to clear codes, a multimeter to test electrical continuity, and basic hand tools to replace the glow plug or repair wiring.
How much does it cost to fix the P06C9 code?
Glow plug replacement costs typically range from $50 to $150 for parts, while labor costs can vary depending on the repair shop. Wiring or module repairs may increase the cost.
Can a bad glow plug damage the engine?
While a bad glow plug won't directly cause engine damage, prolonged issues can lead to poor combustion and wear on other engine components.
How do I prevent the P06C9 code from recurring?
Regular maintenance, including checking the glow plug system and ensuring electrical connections are clean and secure, can help prevent this code from recurring.
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