P06C6 2017 GMC Sierra Code - Cylinder 2 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
- P06C6 2017 GMC Sierra indicates Cylinder 2 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 P06C6 2017 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 P06C6 2017 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 P06C6 2017 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 P06C6 2017 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 P06C6 2017 GMC Sierra Code
1. What does the OBDII code P06C6 mean on a 2017 GMC Sierra?
P06C6 indicates "Cylinder 2 Glow Plug Incorrect," meaning the glow plug in cylinder 2 is malfunctioning or not performing as expected.
2. What are common symptoms of code P06C6 in a GMC Sierra?
Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced engine performance, or an illuminated check engine light.
3. What causes the P06C6 code to appear?
The most common causes are a faulty glow plug, damaged glow plug wiring, a defective glow plug control module, or poor electrical connections in the circuit.
4. Can I still drive my 2017 GMC Sierra with the P06C6 code?
While the truck may still be drivable, ignoring this code can lead to harder starts in cold weather and potential damage to the engine over time. It's best to address the issue promptly.
5. How do I diagnose the P06C6 code?
Start by inspecting the glow plug and its wiring for damage or corrosion. Use a multimeter to check the resistance of the glow plug and test the circuit for proper voltage.
6. How do I fix the P06C6 code on my GMC Sierra?
Common fixes include replacing the faulty glow plug, repairing damaged wiring, cleaning corroded connections, or replacing the glow plug control module if necessary.
7. How much does it cost to repair a P06C6 code?
Replacing a glow plug typically costs between $50 and $150 for parts and labor. If wiring or the control module needs repair, costs may increase depending on the extent of the damage.
8. Can a bad glow plug damage my engine?
A single faulty glow plug is unlikely to cause immediate engine damage, but prolonged issues may lead to harder starts, increased emissions, and potential strain on other engine components.
9. Will clearing the P06C6 code with a scanner fix the problem?
Clearing the code will turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
10. How often should glow plugs be replaced in a GMC Sierra?
Glow plugs typically last around 100,000 miles, but their lifespan can vary depending on driving conditions and maintenance. Regular inspections can help identify issues early.
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