P068E 2015 Chevrolet Silverado Code - Cylinder 8 Glow Plug Control Circuit Low Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #8 glow plug, Cylinder #8 glow plug harness is open or shorted, Cylinder #8 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
- P068E 2015 Chevrolet Silverado indicates Cylinder 8 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty cylinder #8 glow plug, Cylinder #8 glow plug harness is open or shorted, Cylinder #8 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 P068E 2015 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 P068E 2015 Chevrolet Silverado?
- Faulty cylinder #8 glow plug
- Cylinder #8 glow plug harness is open or shorted
- Cylinder #8 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P068E 2015 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 P068E 2015 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 P068E 2015 Chevrolet Silverado Code
What does the OBDII code P068E mean on a 2015 Chevrolet Silverado?
P068E indicates an issue with the Cylinder 8 Glow Plug Control Circuit, specifically a low voltage condition detected by the Engine Control Module (ECM).
What are the common symptoms of the P068E code?
Symptoms may include a check engine light, hard starting in cold weather, reduced engine performance, or increased exhaust smoke.
What causes the P068E code to appear?
Common causes include a faulty cylinder 8 glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or a blown fuse.
Can I drive my 2015 Chevrolet Silverado with the P068E code?
While the truck may still be drivable, starting issues and reduced performance, especially in cold weather, may occur. Prompt diagnosis and repair are recommended.
How do I diagnose the P068E code?
Start by inspecting the glow plug, wiring, and connectors for cylinder 8. Use a multimeter to check for proper voltage and resistance. If no issues are found, test the glow plug control module.
What tools are needed to fix the P068E code?
You may need a multimeter, a diagnostic scanner, and basic hand tools to inspect and repair wiring, replace the glow plug, or install a new control module.
How much does it cost to repair the P068E code?
Repairs can range from $50 to $150 for a single glow plug replacement, while control module replacement may cost $200 to $500, including parts and labor.
Can a faulty glow plug cause engine damage?
A single faulty glow plug typically won’t cause immediate engine damage, but prolonged issues can lead to reduced fuel efficiency, increased emissions, or difficulty starting.
How can I prevent the P068E code from recurring?
Regular maintenance, including inspecting glow plugs and electrical connections, can help prevent this issue. Address any check engine light promptly to avoid further problems.
Is the P068E code covered under warranty for a 2015 Chevrolet Silverado?
It depends on the vehicle's warranty coverage and mileage. Check with your dealership to see if the glow plug or related components are still covered.
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