P06C5 2018 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 2018 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 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 P06C5 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 P06C5 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 P06C5 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 P06C5 2018 GMC Sierra code?
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Frequently Asked Questions about P06C5 2018 GMC Sierra Code
What does OBDII code P06C5 mean for a 2018 GMC Sierra?
Code P06C5 indicates a problem with the glow plug in cylinder 1, specifically an "incorrect" reading, which may suggest a failure or electrical issue.
What are the common symptoms of code P06C5 in a 2018 GMC Sierra?
Symptoms may include difficulty starting the engine in cold weather, a check engine light, reduced fuel efficiency, or rough idling.
What causes the P06C5 code in a 2018 GMC Sierra?
Possible causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or corrosion in electrical components.
Can I drive my 2018 GMC Sierra with code P06C5?
Driving with this code is possible but not recommended, especially in cold weather, as starting the engine may become more difficult and fuel efficiency could be reduced.
How do I diagnose code P06C5 in a 2018 GMC Sierra?
Diagnosis typically involves checking the glow plug in cylinder 1 for damage, inspecting wiring and connectors for corrosion or breaks, and testing the glow plug control module.
How do I fix code P06C5 on a 2018 GMC Sierra?
Repair may involve replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corrosion, or replacing the glow plug control module if necessary.
What tools are needed to fix the P06C5 code in a 2018 GMC Sierra?
You may need an OBDII scanner, a multimeter, and basic hand tools like a socket set and screwdrivers to diagnose and repair the issue.
How much does it cost to fix code P06C5 on a 2018 GMC Sierra?
Repair costs vary but typically range from $50 to $150 for a glow plug replacement, with labor costs depending on the shop.
Can cold weather cause the P06C5 code to appear in a 2018 GMC Sierra?
Cold weather can exacerbate glow plug issues, especially if they are already worn or damaged, leading to the P06C5 code.
Is the P06C5 code covered under warranty for my 2018 GMC Sierra?
Glow plug issues may be covered under a powertrain warranty if the vehicle is still within the warranty period. Check with your dealer for specific coverage details.
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