P068E 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado Code
1. What does the OBDII code P068E mean on a 2018 Chevrolet Silverado?
P068E indicates an issue with the cylinder 8 glow plug control circuit, specifically low voltage, which affects the glow plug's ability to heat properly.
2. What are common symptoms of code P068E on a 2018 Chevrolet Silverado?
Symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and an illuminated check engine light.
3. What causes the P068E code on a 2018 Chevrolet Silverado?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a bad glow plug control module, or corroded electrical connections.
4. Can I drive my 2018 Chevrolet Silverado with the P068E code?
While the vehicle may still run, driving with a P068E code can lead to hard starts, especially in cold weather, and potential long-term engine damage. It's best to address the issue promptly.
5. How do I diagnose the P068E code on my 2018 Chevrolet Silverado?
Diagnosis involves checking the glow plug resistance, inspecting the wiring and connectors, testing the glow plug control module, and verifying the power supply to the circuit.
6. How do I fix the P068E code on a 2018 Chevrolet Silverado?
Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, or replacing the glow plug control module if necessary.
7. Is the P068E code specific to cylinder 8 on a 2018 Chevrolet Silverado?
Yes, this code specifically refers to the glow plug control circuit for cylinder 8, indicating an issue localized to that cylinder.
8. How much does it cost to fix the P068E code on a 2018 Chevrolet Silverado?
Repair costs vary, but replacing a single glow plug typically ranges from $100 to $300, depending on labor and parts. Additional costs may apply for wiring or module repairs.
9. Can a bad battery cause the P068E code on a 2018 Chevrolet Silverado?
Yes, a weak or failing battery can result in insufficient voltage to the glow plug circuit, potentially triggering the P068E code.
10. How can I prevent the P068E code from occurring again on my 2018 Chevrolet Silverado?
Regular maintenance, including inspecting the glow plugs, wiring, and battery, can help prevent issues that lead to the P068E code.
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