P06C7 2018 GMC Sierra Code - Cylinder 3 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
- P06C7 2018 GMC Sierra indicates Cylinder 3 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 P06C7 2018 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 P06C7 2018 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 P06C7 2018 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 P06C7 2018 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.
Need more information about the P06C7 2018 GMC Sierra code?
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Frequently Asked Questions about P06C7 2018 GMC Sierra Code
What does the OBDII code P06C7 mean for a 2018 GMC Sierra?
P06C7 indicates that the cylinder 3 glow plug is not functioning correctly, likely due to a circuit or component failure.
What are the symptoms of code P06C7 on a GMC Sierra?
Common symptoms include difficulty starting the engine in cold weather, rough idling, and the check engine light being illuminated.
What causes the P06C7 code to appear?
Causes may include a faulty glow plug, wiring issues, a damaged glow plug control module, or corroded electrical connections.
Can I drive my GMC Sierra with the P06C7 code?
While the vehicle may still drive, starting issues or engine performance problems in cold weather can worsen if the issue isn't repaired.
How can I diagnose the P06C7 code?
Check the cylinder 3 glow plug for damage, inspect wiring and connectors for corrosion or breaks, and test the glow plug control module for proper operation.
What tools are needed to fix the P06C7 code?
You may need a multimeter, OBDII scanner, and basic hand tools to test and replace the faulty glow plug or repair wiring issues.
How do I replace a faulty glow plug on a 2018 GMC Sierra?
Disconnect the battery, remove the faulty glow plug from cylinder 3 using the appropriate socket, and install a new glow plug securely.
What is the cost to repair the P06C7 code?
Replacing a glow plug typically costs $50-$150 for parts, and labor may add $50-$200 depending on the shop.
Can a P06C7 code affect fuel efficiency?
Yes, a malfunctioning glow plug can cause incomplete combustion, which may slightly reduce fuel efficiency.
How do I prevent the P06C7 code from recurring?
Regularly inspect and maintain the glow plug system, checking for corrosion, damaged wiring, or wear on components.
Discuss the causes and fixes for P06C7 2018 GMC Sierra OBDII Code
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