P068C 2016 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit Low Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 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
- P068C 2016 Chevrolet Silverado indicates Cylinder 7 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 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 P068C 2016 Chevrolet Silverado 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.
What are the Possible Causes of the DTC P068C 2016 Chevrolet Silverado?
- Faulty cylinder #7 glow plug
- Cylinder #7 glow plug harness is open or shorted
- Cylinder #7 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P068C 2016 Chevrolet Silverado?
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 P068C 2016 Chevrolet Silverado 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 P068C 2016 Chevrolet Silverado Code
What does OBDII code P068C mean on a 2016 Chevrolet Silverado?
P068C indicates a low voltage issue in the Cylinder 7 glow plug control circuit, which helps with cold engine starts in diesel engines.
What are the symptoms of code P068C in a 2016 Chevrolet Silverado?
Common symptoms include difficulty starting in cold weather, rough idling, reduced fuel efficiency, and an illuminated check engine light.
What causes code P068C to appear in a 2016 Chevrolet Silverado?
Possible causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or a weak battery.
Can I drive my 2016 Chevrolet Silverado with code P068C active?
While the truck may still be drivable, ignoring the issue could lead to harder cold starts, engine misfires, or additional damage to the glow plug system.
How do I diagnose code P068C on a 2016 Chevrolet Silverado?
Start by inspecting the wiring and connectors for damage, test the Cylinder 7 glow plug for proper resistance, and check the glow plug control module for faults.
How do I fix code P068C on a 2016 Chevrolet Silverado?
Repairs may involve replacing the faulty glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module.
What tools do I need to fix code P068C on a 2016 Chevrolet Silverado?
Basic tools include a multimeter for electrical testing, a scan tool for clearing the code, and possibly a socket set for removing the glow plug.
Does code P068C always mean the glow plug is bad?
No, the issue could also stem from damaged wiring, a faulty control module, or poor electrical connections in the circuit.
How much does it cost to fix code P068C on a 2016 Chevrolet Silverado?
Repair costs can vary, but replacing a glow plug typically costs $50-$150 for parts and labor, while control module repairs could be more expensive.
Can cold weather worsen the effects of code P068C on a 2016 Chevrolet Silverado?
Yes, cold weather can exacerbate starting issues because the glow plugs are critical for warming the engine during cold starts.
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