P06C5 2014 GMC Sierra Code - Cylinder 1 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
- P06C5 2014 GMC Sierra indicates Cylinder 1 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 P06C5 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 P06C5 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 P06C5 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 P06C5 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 P06C5 2014 GMC Sierra Code
1. What does the OBDII code P06C5 mean on a 2014 GMC Sierra?
P06C5 indicates that the Engine Control Module (ECM) has detected an issue with the glow plug in cylinder 1, specifically that it is not operating correctly.
2. What are the common symptoms of code P06C5 in a 2014 GMC Sierra?
Symptoms include difficulty starting the engine in cold weather, reduced engine performance, an illuminated check engine light, and possible rough idling.
3. What causes the P06C5 code to appear on a 2014 GMC Sierra?
Common causes include a faulty glow plug in cylinder 1, damaged wiring or connectors in the glow plug circuit, or a malfunctioning glow plug control module.
4. Can I still drive my 2014 GMC Sierra with a P06C5 code?
While the truck may still be drivable, operating the vehicle with a faulty glow plug can lead to harder starting in cold conditions and potential long-term damage to the engine.
5. How do I diagnose the P06C5 code on my GMC Sierra?
Diagnosis typically involves inspecting the glow plug in cylinder 1, checking the wiring and connectors for damage, testing the glow plug resistance, and verifying the operation of the glow plug control module.
6. How do I fix the P06C5 code on a 2014 GMC Sierra?
Fixes may include replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, or replacing the glow plug control module if it’s defective.
7. How much does it cost to repair a P06C5 code on a GMC Sierra?
Repair costs vary but typically range from $100 to $300, depending on whether you’re replacing the glow plug, repairing wiring, or addressing control module issues.
8. Can a bad glow plug cause other problems in my GMC Sierra?
Yes, a bad glow plug can lead to poor engine performance, increased emissions, and difficulty starting, especially in cold weather.
9. How do I prevent the P06C5 code from recurring?
Regular maintenance, including checking and replacing glow plugs as needed, inspecting wiring for damage, and addressing issues promptly, can help prevent this code from returning.
10. Will clearing the P06C5 code fix the issue on my GMC Sierra?
Clearing the code will remove the check engine light temporarily, but if the underlying issue isn’t resolved, the code will return.
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