P068E 2014 GMC Sierra 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 2014 GMC Sierra 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 2014 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.
What are the Possible Causes of the DTC P068E 2014 GMC Sierra?
- 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 2014 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 P068E 2014 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.
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Frequently Asked Questions about P068E 2014 GMC Sierra Code
1. What does the OBDII code P068E mean on a 2014 GMC Sierra?
P068E refers to an issue with the Cylinder 8 Glow Plug Control Circuit, specifically low voltage detected in the circuit.
2. What are the common symptoms of P068E on a 2014 GMC Sierra?
Symptoms may include difficulty starting in cold weather, reduced engine performance, a check engine light, and increased emissions.
3. What causes the P068E code on a 2014 GMC Sierra?
Common 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.
4. Can I still drive my 2014 GMC Sierra with a P068E code?
While the truck may be drivable, starting issues in cold weather and reduced efficiency might occur. Prompt diagnosis and repair are recommended to avoid potential damage.
5. How do I diagnose the P068E code on a 2014 GMC Sierra?
Use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, test the glow plug for continuity, and check the glow plug control module for proper operation.
6. How do I fix the P068E code on my 2014 GMC Sierra?
Repairs may include replacing the faulty glow plug, repairing damaged wiring, cleaning or replacing corroded connectors, or replacing the glow plug control module if needed.
7. How much does it cost to fix the P068E code on a 2014 GMC Sierra?
Repair costs can vary but typically range from $100 to $300 depending on whether the issue lies with the glow plug, wiring, or control module.
8. Can a weak battery cause the P068E code in a 2014 GMC Sierra?
Yes, a weak or failing battery can contribute to low voltage in the glow plug circuit and trigger the P068E code.
9. What tools are needed to troubleshoot the P068E code on a 2014 GMC Sierra?
Basic tools include an OBDII scanner, a multimeter for voltage and continuity tests, and possibly a socket set for removing the glow plug.
10. Does the P068E code affect fuel efficiency in a 2014 GMC Sierra?
Yes, a malfunctioning glow plug can lead to incomplete combustion, which may decrease fuel efficiency and increase emissions.
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