P068D 2017 Chevrolet Silverado Code - Cylinder 7 Glow Plug Control Circuit High 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
- P068D 2017 Chevrolet Silverado indicates Cylinder 7 Glow Plug Control Circuit High 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 P068D 2017 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 P068D 2017 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 P068D 2017 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 P068D 2017 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.
Need more information about the P068D 2017 Chevrolet Silverado code?
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Frequently Asked Questions about P068D 2017 Chevrolet Silverado Code
What does OBDII code P068D mean on a 2017 Chevrolet Silverado?
P068D indicates a high voltage issue in the Cylinder 7 Glow Plug Control Circuit, which is responsible for preheating the cylinder for better combustion in cold starts.
What are the symptoms of code P068D on a 2017 Chevrolet Silverado?
Common symptoms include difficulty starting in cold weather, reduced engine performance, a lit check engine light, and possible rough idling.
What causes the P068D code on a 2017 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 corroded electrical connections.
Can I drive my 2017 Chevrolet Silverado with a P068D code?
While the vehicle may still be drivable, ignoring the issue can lead to harder starts in cold weather and potentially reduced engine performance over time.
How is the P068D code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the glow plug circuit for damage, test the glow plug's resistance, and check the control module for proper operation.
How do I fix the P068D code on my 2017 Chevrolet Silverado?
Repair steps may include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the glow plug control module if necessary.
How much does it cost to repair code P068D on a 2017 Chevrolet Silverado?
The cost depends on the exact issue. Replacing a glow plug typically costs $50–$150, while repairing wiring or replacing the control module can range from $100–$500.
Can a weak battery cause the P068D code?
Yes, a weak or failing battery may result in improper voltage to the glow plug circuit, which can trigger the P068D code.
Is the P068D code specific to Cylinder 7?
Yes, this code specifically refers to a high voltage issue in the glow plug control circuit for Cylinder 7.
Do I need special tools to fix the P068D code on a 2017 Chevrolet Silverado?
Yes, diagnosing and repairing this code may require a multimeter for testing resistance, a scan tool for code verification, and basic tools for accessing and replacing components.
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